diff --git a/moo/Makefile.in b/moo/Makefile.in
index 2105b34..9e029b0 100644
--- a/moo/Makefile.in
+++ b/moo/Makefile.in
@@ -355,7 +355,6 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
-runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
@@ -586,7 +585,7 @@ distdir: $(DISTFILES)
 	  ! -type d ! -perm -444 -exec $(install_sh) -c -m a+r {} {} \; \
 	|| chmod -R a+r "$(distdir)"
 dist-gzip: distdir
-	tardir=$(distdir) && $(am__tar) | GZIP=$(GZIP_ENV) gzip -c >$(distdir).tar.gz
+	tardir=$(distdir) && $(am__tar) | eval GZIP= gzip $(GZIP_ENV) -c >$(distdir).tar.gz
 	$(am__post_remove_distdir)
 
 dist-bzip2: distdir
@@ -612,7 +611,7 @@ dist-shar: distdir
 	@echo WARNING: "Support for shar distribution archives is" \
 	               "deprecated." >&2
 	@echo WARNING: "It will be removed altogether in Automake 2.0" >&2
-	shar $(distdir) | GZIP=$(GZIP_ENV) gzip -c >$(distdir).shar.gz
+	shar $(distdir) | eval GZIP= gzip $(GZIP_ENV) -c >$(distdir).shar.gz
 	$(am__post_remove_distdir)
 
 dist-zip: distdir
@@ -630,7 +629,7 @@ dist dist-all:
 distcheck: dist
 	case '$(DIST_ARCHIVES)' in \
 	*.tar.gz*) \
-	  GZIP=$(GZIP_ENV) gzip -dc $(distdir).tar.gz | $(am__untar) ;;\
+	  eval GZIP= gzip $(GZIP_ENV) -dc $(distdir).tar.gz | $(am__untar) ;;\
 	*.tar.bz2*) \
 	  bzip2 -dc $(distdir).tar.bz2 | $(am__untar) ;;\
 	*.tar.lz*) \
@@ -640,7 +639,7 @@ distcheck: dist
 	*.tar.Z*) \
 	  uncompress -c $(distdir).tar.Z | $(am__untar) ;;\
 	*.shar.gz*) \
-	  GZIP=$(GZIP_ENV) gzip -dc $(distdir).shar.gz | unshar ;;\
+	  eval GZIP= gzip $(GZIP_ENV) -dc $(distdir).shar.gz | unshar ;;\
 	*.zip*) \
 	  unzip $(distdir).zip ;;\
 	esac
diff --git a/moo/configure b/moo/configure
index f68671d..f6da54c 100755
--- a/moo/configure
+++ b/moo/configure
@@ -657,6 +657,8 @@ ENABLE_MOD_FFI_FALSE
 ENABLE_MOD_FFI_TRUE
 ENABLE_MOD_CON_FALSE
 ENABLE_MOD_CON_TRUE
+ENABLE_LIBUNWIND_FALSE
+ENABLE_LIBUNWIND_TRUE
 ENABLE_LIBLTDL_FALSE
 ENABLE_LIBLTDL_TRUE
 ENABLE_STATIC_MODULE_FALSE
@@ -787,7 +789,6 @@ infodir
 docdir
 oldincludedir
 includedir
-runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -826,6 +827,7 @@ enable_cxx
 enable_dynamic_module
 enable_static_module
 enable_libltdl
+enable_libunwind
 enable_mod_con
 enable_mod_ffi
 enable_mod_sck
@@ -883,7 +885,6 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
-runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1136,15 +1137,6 @@ do
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;
 
-  -runstatedir | --runstatedir | --runstatedi | --runstated \
-  | --runstate | --runstat | --runsta | --runst | --runs \
-  | --run | --ru | --r)
-    ac_prev=runstatedir ;;
-  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
-  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
-  | --run=* | --ru=* | --r=*)
-    runstatedir=$ac_optarg ;;
-
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1282,7 +1274,7 @@ fi
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir runstatedir
+		libdir localedir mandir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1435,7 +1427,6 @@ Fine tuning of the installation directories:
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
-  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]
@@ -1495,6 +1486,7 @@ Optional Features:
   --enable-static-module  build modules statically into the main
                           library(default. no)
   --enable-libltdl        use libltdl(default. no)
+  --enable-libunwind      use libunwind(default. no)
   --enable-mod-con        enable mod/con (default. yes)
   --enable-mod-ffi        enable mod/ffi (default. yes)
   --enable-mod-sck        enable mod/sck (default. yes)
@@ -21528,6 +21520,34 @@ else
 fi
 
 
+# Check whether --enable-libunwind was given.
+if test "${enable_libunwind+set}" = set; then :
+  enableval=$enable_libunwind; enable_libunwind_is=$enableval
+else
+  enable_libunwind_is=no
+
+fi
+
+if test "x${enable_libunwind_is}" = "xyes"
+then
+	if test "x${ac_cv_header_unwind_h}" = "xyes"  -a "${UNWIND_LIBS}" != ""
+	then
+
+$as_echo "#define MOO_ENABLE_LIBUNWIND /**/" >>confdefs.h
+
+	else
+		enable_libunwind_is="no"
+	fi
+fi
+ if test "x${enable_libunwind_is}" = "xyes"; then
+  ENABLE_LIBUNWIND_TRUE=
+  ENABLE_LIBUNWIND_FALSE='#'
+else
+  ENABLE_LIBUNWIND_TRUE='#'
+  ENABLE_LIBUNWIND_FALSE=
+fi
+
+
 # Check whether --enable-mod-con was given.
 if test "${enable_mod_con+set}" = set; then :
   enableval=$enable_mod_con; enable_mod_con_is=$enableval
@@ -21814,6 +21834,10 @@ if test -z "${ENABLE_LIBLTDL_TRUE}" && test -z "${ENABLE_LIBLTDL_FALSE}"; then
   as_fn_error $? "conditional \"ENABLE_LIBLTDL\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
+if test -z "${ENABLE_LIBUNWIND_TRUE}" && test -z "${ENABLE_LIBUNWIND_FALSE}"; then
+  as_fn_error $? "conditional \"ENABLE_LIBUNWIND\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
 if test -z "${ENABLE_MOD_CON_TRUE}" && test -z "${ENABLE_MOD_CON_FALSE}"; then
   as_fn_error $? "conditional \"ENABLE_MOD_CON\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
diff --git a/moo/configure.ac b/moo/configure.ac
index e38f824..6818112 100644
--- a/moo/configure.ac
+++ b/moo/configure.ac
@@ -737,6 +737,23 @@ then
 fi
 AM_CONDITIONAL(ENABLE_LIBLTDL, test "x${enable_libltdl_is}" = "xyes")
 
+dnl ===== enable-libunwind =====
+AC_ARG_ENABLE([libunwind],
+	[AS_HELP_STRING([--enable-libunwind],[use libunwind(default. no)])],
+	enable_libunwind_is=$enableval,
+	enable_libunwind_is=no
+)
+if test "x${enable_libunwind_is}" = "xyes"
+then
+	if test "x${ac_cv_header_unwind_h}" = "xyes"  -a "${UNWIND_LIBS}" != ""
+	then
+		AC_DEFINE([MOO_ENABLE_LIBUNWIND],[],[use libunwind for backtracing stack frames])
+	else
+		enable_libunwind_is="no"
+	fi
+fi
+AM_CONDITIONAL(ENABLE_LIBUNWIND, test "x${enable_libunwind_is}" = "xyes")
+
 dnl ===== enable-mod-con =====
 AC_ARG_ENABLE([mod-con],
 	[AS_HELP_STRING([--enable-mod-con],[enable mod/con (default. yes)])],
diff --git a/moo/lib/Makefile.am b/moo/lib/Makefile.am
index 29d7e25..3ca7c34 100644
--- a/moo/lib/Makefile.am
+++ b/moo/lib/Makefile.am
@@ -27,6 +27,10 @@ else
 LIBADD_LIB_COMMON += $(DL_LIBS)
 endif
 
+if ENABLE_LIBUNWIND
+LIBADD_LIB_COMMON += $(UNWIND_LIBS)
+endif
+
 if WIN32
 # you must adjust the value of DEFAULT_MODPOSTFIX according 
 # to the first number in -version-info above
diff --git a/moo/lib/Makefile.in b/moo/lib/Makefile.in
index b09dd70..b67f6e6 100644
--- a/moo/lib/Makefile.in
+++ b/moo/lib/Makefile.in
@@ -90,29 +90,30 @@ build_triplet = @build@
 host_triplet = @host@
 @ENABLE_LIBLTDL_TRUE@am__append_1 = $(LTDL_LIBS)
 @ENABLE_LIBLTDL_FALSE@am__append_2 = $(DL_LIBS)
+@ENABLE_LIBUNWIND_TRUE@am__append_3 = $(UNWIND_LIBS)
 
 # you must adjust the value of DEFAULT_MODPOSTFIX according 
 # to the first number in -version-info above
-@WIN32_TRUE@am__append_3 = -DMOO_DEFAULT_MODPREFIX=\"libmoo-\" -DMOO_DEFAULT_MODPOSTFIX=\"-1\"
-@WIN32_FALSE@am__append_4 = -DMOO_DEFAULT_MODPREFIX=\"$(libdir)/libmoo-\" -DMOO_DEFAULT_MODPOSTFIX=\"\"
-@ENABLE_STATIC_MODULE_TRUE@am__append_5 = -lmoo-stdio
+@WIN32_TRUE@am__append_4 = -DMOO_DEFAULT_MODPREFIX=\"libmoo-\" -DMOO_DEFAULT_MODPOSTFIX=\"-1\"
+@WIN32_FALSE@am__append_5 = -DMOO_DEFAULT_MODPREFIX=\"$(libdir)/libmoo-\" -DMOO_DEFAULT_MODPOSTFIX=\"\"
+@ENABLE_STATIC_MODULE_TRUE@am__append_6 = -lmoo-stdio
 @ENABLE_STATIC_MODULE_FALSE@libmoo_la_DEPENDENCIES =  \
-@ENABLE_STATIC_MODULE_FALSE@	$(am__DEPENDENCIES_4) \
+@ENABLE_STATIC_MODULE_FALSE@	$(am__DEPENDENCIES_5) \
 @ENABLE_STATIC_MODULE_FALSE@	$(am__DEPENDENCIES_1) \
 @ENABLE_STATIC_MODULE_FALSE@	$(am__DEPENDENCIES_1) \
 @ENABLE_STATIC_MODULE_FALSE@	$(am__DEPENDENCIES_1) \
 @ENABLE_STATIC_MODULE_FALSE@	$(am__DEPENDENCIES_1) \
 @ENABLE_STATIC_MODULE_FALSE@	$(am__DEPENDENCIES_1)
-@ENABLE_MOD_CON_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_6 = -lmoo-con
-@ENABLE_MOD_CON_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_7 = $(abs_builddir)/../mod/libmoo-con.la
-@ENABLE_MOD_FFI_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_8 = -lmoo-ffi
-@ENABLE_MOD_FFI_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_9 = $(abs_builddir)/../mod/libmoo-ffi.la
-@ENABLE_MOD_SCK_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_10 = -lmoo-sck
-@ENABLE_MOD_SCK_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_11 = $(abs_builddir)/../mod/libmoo-sck.la
-@ENABLE_MOD_X11_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_12 = -lmoo-x11
-@ENABLE_MOD_X11_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_13 = $(abs_builddir)/../mod/libmoo-x11.la
+@ENABLE_MOD_CON_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_7 = -lmoo-con
+@ENABLE_MOD_CON_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_8 = $(abs_builddir)/../mod/libmoo-con.la
+@ENABLE_MOD_FFI_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_9 = -lmoo-ffi
+@ENABLE_MOD_FFI_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_10 = $(abs_builddir)/../mod/libmoo-ffi.la
+@ENABLE_MOD_SCK_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_11 = -lmoo-sck
+@ENABLE_MOD_SCK_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_12 = $(abs_builddir)/../mod/libmoo-sck.la
+@ENABLE_MOD_X11_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_13 = -lmoo-x11
+@ENABLE_MOD_X11_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_14 = $(abs_builddir)/../mod/libmoo-x11.la
 bin_PROGRAMS = moo$(EXEEXT)
-@ENABLE_STATIC_MODULE_FALSE@moo_DEPENDENCIES = $(am__DEPENDENCIES_4) \
+@ENABLE_STATIC_MODULE_FALSE@moo_DEPENDENCIES = $(am__DEPENDENCIES_5) \
 @ENABLE_STATIC_MODULE_FALSE@	$(am__DEPENDENCIES_1)
 subdir = lib
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
@@ -163,8 +164,9 @@ LTLIBRARIES = $(pkglib_LTLIBRARIES)
 am__DEPENDENCIES_1 =
 @ENABLE_LIBLTDL_TRUE@am__DEPENDENCIES_2 = $(am__DEPENDENCIES_1)
 @ENABLE_LIBLTDL_FALSE@am__DEPENDENCIES_3 = $(am__DEPENDENCIES_1)
-am__DEPENDENCIES_4 = $(am__DEPENDENCIES_1) $(am__DEPENDENCIES_2) \
-	$(am__DEPENDENCIES_3)
+@ENABLE_LIBUNWIND_TRUE@am__DEPENDENCIES_4 = $(am__DEPENDENCIES_1)
+am__DEPENDENCIES_5 = $(am__DEPENDENCIES_1) $(am__DEPENDENCIES_2) \
+	$(am__DEPENDENCIES_3) $(am__DEPENDENCIES_4)
 am_libmoo_la_OBJECTS = libmoo_la-bigint.lo libmoo_la-comp.lo \
 	libmoo_la-debug.lo libmoo_la-decode.lo libmoo_la-dic.lo \
 	libmoo_la-err.lo libmoo_la-exec.lo libmoo_la-logfmt.lo \
@@ -398,7 +400,6 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
-runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
@@ -420,10 +421,11 @@ CPPFLAGS_ALL_COMMON = \
 ##################################################
 # MAIN LIBRARY 
 ##################################################
-CPPFLAGS_LIB_COMMON = $(CPPFLAGS_ALL_COMMON) $(am__append_3) \
-	$(am__append_4)
+CPPFLAGS_LIB_COMMON = $(CPPFLAGS_ALL_COMMON) $(am__append_4) \
+	$(am__append_5)
 LDFLAGS_LIB_COMMON = $(LDFLAGS_ALL_COMMON) -version-info 1:0:0 -no-undefined
-LIBADD_LIB_COMMON = $(LIBM) $(am__append_1) $(am__append_2)
+LIBADD_LIB_COMMON = $(LIBM) $(am__append_1) $(am__append_2) \
+	$(am__append_3)
 pkginclude_HEADERS = \
 	moo.h \
 	moo-bct.h \
@@ -467,12 +469,12 @@ libmoo_la_SOURCES = \
 
 libmoo_la_CPPFLAGS = $(CPPFLAGS_LIB_COMMON)
 libmoo_la_LDFLAGS = $(LDFLAGS_LIB_COMMON)
-libmoo_la_LIBADD = $(LIBADD_LIB_COMMON) $(am__append_5) \
-	$(am__append_6) $(am__append_8) $(am__append_10) \
-	$(am__append_12)
+libmoo_la_LIBADD = $(LIBADD_LIB_COMMON) $(am__append_6) \
+	$(am__append_7) $(am__append_9) $(am__append_11) \
+	$(am__append_13)
 @ENABLE_STATIC_MODULE_TRUE@libmoo_la_DEPENDENCIES = $(abs_builddir)/../mod/libmoo-stdio.la \
-@ENABLE_STATIC_MODULE_TRUE@	$(am__append_7) $(am__append_9) \
-@ENABLE_STATIC_MODULE_TRUE@	$(am__append_11) $(am__append_13)
+@ENABLE_STATIC_MODULE_TRUE@	$(am__append_8) $(am__append_10) \
+@ENABLE_STATIC_MODULE_TRUE@	$(am__append_12) $(am__append_14)
 moo_SOURCES = main.c
 moo_CPPFLAGS = $(CPPFLAGS_LIB_COMMON)
 moo_LDFLAGS = $(LDFLAGS_LIB_COMMON)
diff --git a/moo/lib/err.c b/moo/lib/err.c
index ae06395..667e12c 100644
--- a/moo/lib/err.c
+++ b/moo/lib/err.c
@@ -26,6 +26,9 @@
 
 #include "moo-prv.h"
 
+#if defined(MOO_ENABLE_LIBUNWIND)
+#	include <libunwind.h>
+#endif
 
 /* BEGIN: GENERATED WITH generr.moo */
 
@@ -466,21 +469,44 @@ void moo_setsynerr (moo_t* moo, moo_synerrnum_t num, const moo_ioloc_t* loc, con
 #endif
 
 /* -------------------------------------------------------------------------- 
- * ASSERTION FAILURE HANDLERsemaphore heap full
+ * STACK FRAME BACKTRACE
  * -------------------------------------------------------------------------- */
-
-void moo_assertfailed (moo_t* moo, const moo_bch_t* expr, const moo_bch_t* file, moo_oow_t line)
+#if defined(MOO_ENABLE_LIBUNWIND)
+void backtrace_stack_frames (moo_t* moo)
+{
+	unw_cursor_t cursor;
+	unw_context_t context;
+
+	unw_getcontext(&context);
+	unw_init_local(&cursor, &context);
+
+	int n=0;
+	while (unw_step(&cursor)) 
+	{
+		unw_word_t ip, sp, off;
+
+		unw_get_reg (&cursor, UNW_REG_IP, &ip);
+		unw_get_reg (&cursor, UNW_REG_SP, &sp);
+
+		char symbol[256];
+
+		if (!unw_get_proc_name(&cursor, symbol, MOO_COUNTOF(symbol), &off)) 
+		{
+			moo_copy_bcstr (symbol, "<unknown>");
+		}
+
+		moo_logbfmt (moo, MOO_LOG_UNTYPED | MOO_LOG_DEBUG, 
+			"#%-2d 0x%016p p=0x%016p %s + 0x%zu\n", 
+			++n, (void*)ip, (void*)sp, symbol, (moo_oow_t)off);
+	}
+}
+#elif defined(HAVE_BACKTRACE)
+void backtrace_stack_frames (moo_t* moo)
 {
-#if defined(HAVE_BACKTRACE)
 	void* btarray[128];
 	moo_oow_t btsize;
 	char** btsyms;
-#endif
 
-	moo_logbfmt (moo, MOO_LOG_UNTYPED | MOO_LOG_FATAL, "ASSERTION FAILURE: %s at %s:%zu\n", expr, file, line);
-
-
-#if defined(HAVE_BACKTRACE)
 	btsize = backtrace (btarray, MOO_COUNTOF(btarray));
 	btsyms = backtrace_symbols (btarray, btsize);
 	if (btsyms)
@@ -494,8 +520,23 @@ void moo_assertfailed (moo_t* moo, const moo_bch_t* expr, const moo_bch_t* file,
 		}
 		free (btsyms);
 	}
+}
+#else
+void backtrace_stack_frames (moo_t* moo)
+{
+	/* do nothing. not supported */
+}
 #endif
 
+/* -------------------------------------------------------------------------- 
+ * ASSERTION FAILURE HANDLER
+ * -------------------------------------------------------------------------- */
+
+
+void moo_assertfailed (moo_t* moo, const moo_bch_t* expr, const moo_bch_t* file, moo_oow_t line)
+{
+	moo_logbfmt (moo, MOO_LOG_UNTYPED | MOO_LOG_FATAL, "ASSERTION FAILURE: %s at %s:%zu\n", expr, file, line);
+	backtrace_stack_frames (moo);
 
 #if defined(_WIN32)
 	ExitProcess (249);
diff --git a/moo/lib/exec.c b/moo/lib/exec.c
index d60cfc9..c608349 100644
--- a/moo/lib/exec.c
+++ b/moo/lib/exec.c
@@ -1841,7 +1841,7 @@ static moo_pfrc_t pf_dump (moo_t* moo, moo_ooi_t nargs)
 	return MOO_PF_SUCCESS;
 }
 
-static void log_char_object (moo_t* moo, moo_oow_t mask, moo_oop_char_t msg)
+static void log_char_object (moo_t* moo, moo_log_masks_t mask, moo_oop_char_t msg)
 {
 	moo_ooi_t n;
 	moo_oow_t rem;
@@ -3354,7 +3354,7 @@ static moo_pfrc_t pf_strlen (moo_t* moo, moo_ooi_t nargs)
 static moo_pfrc_t pf_system_log (moo_t* moo, moo_ooi_t nargs)
 {
 	moo_oop_t msg, level;
-	moo_oow_t mask;
+	moo_log_masks_t mask;
 	moo_ooi_t k;
 
 	MOO_ASSERT (moo, nargs >=  2);
diff --git a/moo/lib/logfmt.c b/moo/lib/logfmt.c
index 98a4d64..c441468 100644
--- a/moo/lib/logfmt.c
+++ b/moo/lib/logfmt.c
@@ -129,15 +129,15 @@ static moo_uch_t uch_nullstr[] = { '(','n','u','l','l', ')','\0' };
 static moo_bch_t bch_nullstr[] = { '(','n','u','l','l', ')','\0' };
 
 typedef int (*moo_fmtout_putch_t) (
-	moo_t*      moo,
-	moo_oow_t   mask,
-	moo_ooch_t  c,
-	moo_oow_t   len
+	moo_t*          moo,
+	moo_log_masks_t mask,
+	moo_ooch_t      c,
+	moo_oow_t       len
 );
 
 typedef int (*moo_fmtout_putcs_t) (
 	moo_t*            moo,
-	moo_oow_t         mask,
+	moo_log_masks_t   mask,
 	const moo_ooch_t* ptr,
 	moo_oow_t         len
 );
@@ -146,7 +146,7 @@ typedef struct moo_fmtout_t moo_fmtout_t;
 struct moo_fmtout_t
 {
 	moo_oow_t            count; /* out */
-	moo_oow_t            mask;  /* in */
+	moo_log_masks_t      mask;  /* in */
 	moo_fmtout_putch_t   putch; /* in */
 	moo_fmtout_putcs_t   putcs; /* in */
 };
@@ -184,7 +184,7 @@ static moo_bch_t* sprintn_upper (moo_bch_t* nbuf, moo_uintmax_t num, int base, m
 }
 
 /* ------------------------------------------------------------------------- */
-static int put_ooch (moo_t* moo, moo_oow_t mask, moo_ooch_t ch, moo_oow_t len)
+static int put_ooch (moo_t* moo, moo_log_masks_t mask, moo_ooch_t ch, moo_oow_t len)
 {
 	/* this is not equivalent to put_oocs(moo,mask,&ch, 1);
 	 * this function is to emit a single character multiple times */
@@ -281,7 +281,7 @@ redo:
 	return 1; /* success */
 }
 
-static int put_oocs (moo_t* moo, moo_oow_t mask, const moo_ooch_t* ptr, moo_oow_t len)
+static int put_oocs (moo_t* moo, moo_log_masks_t mask, const moo_ooch_t* ptr, moo_oow_t len)
 {
 	moo_oow_t rem;
 
@@ -374,9 +374,9 @@ redo:
 
 /* ------------------------------------------------------------------------- */
 
-typedef moo_ooi_t (*outbfmt_t) (moo_t* moo, moo_oow_t mask, const moo_bch_t* fmt, ...);
+typedef moo_ooi_t (*outbfmt_t) (moo_t* moo, moo_log_masks_t mask, const moo_bch_t* fmt, ...);
 
-static int print_object (moo_t* moo, moo_oow_t mask, moo_oop_t oop, outbfmt_t outbfmt)
+static int print_object (moo_t* moo, moo_log_masks_t mask, moo_oop_t oop, outbfmt_t outbfmt)
 {
 	if (oop == moo->_nil)
 	{
@@ -612,7 +612,7 @@ static int _logufmtv (moo_t* moo, const moo_uch_t* fmt, moo_fmtout_t* data, va_l
 	return __logufmtv (moo, fmt, data, ap, moo_logbfmt);
 }
 
-moo_ooi_t moo_logbfmt (moo_t* moo, moo_oow_t mask, const moo_bch_t* fmt, ...)
+moo_ooi_t moo_logbfmt (moo_t* moo, moo_log_masks_t mask, const moo_bch_t* fmt, ...)
 {
 	int x;
 	va_list ap;
@@ -645,7 +645,7 @@ moo_ooi_t moo_logbfmt (moo_t* moo, moo_oow_t mask, const moo_bch_t* fmt, ...)
 	return (x <= -1)? -1: fo.count;
 }
 
-moo_ooi_t moo_logufmt (moo_t* moo, moo_oow_t mask, const moo_uch_t* fmt, ...)
+moo_ooi_t moo_logufmt (moo_t* moo, moo_log_masks_t mask, const moo_uch_t* fmt, ...)
 {
 	int x;
 	va_list ap;
@@ -679,7 +679,7 @@ moo_ooi_t moo_logufmt (moo_t* moo, moo_oow_t mask, const moo_uch_t* fmt, ...)
  * ERROR MESSAGE FORMATTING
  * -------------------------------------------------------------------------- */
 
-static int put_errch (moo_t* moo, moo_oow_t mask, moo_ooch_t ch, moo_oow_t len)
+static int put_errch (moo_t* moo, moo_log_masks_t mask, moo_ooch_t ch, moo_oow_t len)
 {
 	moo_oow_t max;
 
@@ -698,7 +698,7 @@ static int put_errch (moo_t* moo, moo_oow_t mask, moo_ooch_t ch, moo_oow_t len)
 	return 1; /* success */
 }
 
-static int put_errcs (moo_t* moo, moo_oow_t mask, const moo_ooch_t* ptr, moo_oow_t len)
+static int put_errcs (moo_t* moo, moo_log_masks_t mask, const moo_ooch_t* ptr, moo_oow_t len)
 {
 	moo_oow_t max;
 
@@ -715,7 +715,7 @@ static int put_errcs (moo_t* moo, moo_oow_t mask, const moo_ooch_t* ptr, moo_oow
 }
 
 
-static moo_ooi_t __errbfmtv (moo_t* moo, moo_oow_t mask, const moo_bch_t* fmt, ...);
+static moo_ooi_t __errbfmtv (moo_t* moo, moo_log_masks_t mask, const moo_bch_t* fmt, ...);
 
 static int _errbfmtv (moo_t* moo, const moo_bch_t* fmt, moo_fmtout_t* data, va_list ap)
 {
@@ -727,7 +727,7 @@ static int _errufmtv (moo_t* moo, const moo_uch_t* fmt, moo_fmtout_t* data, va_l
 	return __logufmtv (moo, fmt, data, ap, __errbfmtv);
 }
 
-static moo_ooi_t __errbfmtv (moo_t* moo, moo_oow_t mask, const moo_bch_t* fmt, ...)
+static moo_ooi_t __errbfmtv (moo_t* moo, moo_log_masks_t mask, const moo_bch_t* fmt, ...)
 {
 	va_list ap;
 	moo_fmtout_t fo;
diff --git a/moo/lib/main.c b/moo/lib/main.c
index 6e13b06..7c91e60 100644
--- a/moo/lib/main.c
+++ b/moo/lib/main.c
@@ -214,7 +214,7 @@ struct xtn_t
 	int vm_running;
 
 	int logfd;
-	int logmask;
+	moo_log_masks_t logmask;
 	int logfd_istty;
 	
 	struct
@@ -657,7 +657,7 @@ static void flush_log (moo_t* moo, int fd)
 	}
 }
 
-static void log_write (moo_t* moo, unsigned int mask, const moo_ooch_t* msg, moo_oow_t len)
+static void log_write (moo_t* moo, moo_log_masks_t mask, const moo_ooch_t* msg, moo_oow_t len)
 {
 	moo_bch_t buf[256];
 	moo_oow_t ucslen, bcslen, msgidx;
@@ -2213,7 +2213,7 @@ static int handle_logopt (moo_t* moo, const moo_bch_t* str)
 	xtn_t* xtn = moo_getxtn (moo);
 	moo_bch_t* xstr = (moo_bch_t*)str;
 	moo_bch_t* cm, * flt;
-	unsigned int logmask;
+	moo_log_masks_t logmask;
 
 	cm = moo_find_bchar_in_bcstr (xstr, ',');
 	if (cm) 
@@ -2299,7 +2299,7 @@ static int handle_dbgopt (moo_t* moo, const moo_bch_t* str)
 	xtn_t* xtn = moo_getxtn (moo);
 	const moo_bch_t* cm, * flt;
 	moo_oow_t len;
-	unsigned int trait, dbgopt = 0;
+	moo_traits_t trait, dbgopt = 0;
 
 	cm = str - 1;
 	do
@@ -2467,7 +2467,7 @@ int main (int argc, char* argv[])
 	}
 
 	{
-		unsigned int trait = 0;
+		moo_traits_t trait = 0;
 
 		/*trait |= MOO_NOGC;*/
 		trait |= MOO_AWAIT_PROCS;
diff --git a/moo/lib/moo-cfg.h.in b/moo/lib/moo-cfg.h.in
index eb1d52f..bb31d38 100644
--- a/moo/lib/moo-cfg.h.in
+++ b/moo/lib/moo-cfg.h.in
@@ -303,6 +303,9 @@
 /* use libltdl when loading a dynamic module */
 #undef MOO_ENABLE_LIBLTDL
 
+/* use libunwind for backtracing stack frames */
+#undef MOO_ENABLE_LIBUNWIND
+
 /* build mod/con */
 #undef MOO_ENABLE_MOD_CON
 
diff --git a/moo/lib/moo.c b/moo/lib/moo.c
index 936df69..7e24b6b 100644
--- a/moo/lib/moo.c
+++ b/moo/lib/moo.c
@@ -291,14 +291,14 @@ int moo_setoption (moo_t* moo, moo_option_t id, const void* value)
 	switch (id)
 	{
 		case MOO_TRAIT:
-			moo->option.trait = *(const unsigned int*)value;
+			moo->option.trait = *(moo_traits_t*)value;
 		#if defined(MOO_BUILD_DEBUG)
 			moo->option.karatsuba_cutoff = ((moo->option.trait & MOO_DEBUG_BIGINT)? MOO_KARATSUBA_CUTOFF_DEBUG: MOO_KARATSUBA_CUTOFF);
 		#endif
 			return 0;
 
 		case MOO_LOG_MASK:
-			moo->option.log_mask = *(const unsigned int*)value;
+			moo->option.log_mask = *(moo_log_masks_t*)value;
 			return 0;
 
 		case MOO_LOG_MAXCAPA:
@@ -353,11 +353,11 @@ int moo_getoption (moo_t* moo, moo_option_t id, void* value)
 	switch  (id)
 	{
 		case MOO_TRAIT:
-			*(unsigned int*)value = moo->option.trait;
+			*(moo_traits_t*)value = moo->option.trait;
 			return 0;
 
 		case MOO_LOG_MASK:
-			*(unsigned int*)value = moo->option.log_mask;
+			*(moo_log_masks_t*)value = moo->option.log_mask;
 			return 0;
 
 		case MOO_LOG_MAXCAPA:
diff --git a/moo/lib/moo.h b/moo/lib/moo.h
index e46702a..c606474 100644
--- a/moo/lib/moo.h
+++ b/moo/lib/moo.h
@@ -115,19 +115,21 @@ typedef enum moo_option_dflval_t moo_option_dflval_t;
 enum moo_trait_t
 {
 #if defined(MOO_BUILD_DEBUG)
-	MOO_DEBUG_GC     = (1 << 0),
-	MOO_DEBUG_BIGINT = (1 << 1),
+	MOO_DEBUG_GC     = (1u << 0),
+	MOO_DEBUG_BIGINT = (1u << 1),
 #endif
 
 	/* perform no garbage collection when the heap is full. 
 	 * you still can use moo_gc() explicitly. */
-	MOO_NOGC = (1 << 8),
+	MOO_NOGC = (1u << 8),
 
 	/* wait for running process when exiting from the main method */
-	MOO_AWAIT_PROCS = (1 << 9)
+	MOO_AWAIT_PROCS = (1u << 9)
 };
 typedef enum moo_trait_t moo_trait_t;
 
+typedef unsigned int moo_traits_t;
+
 typedef struct moo_obj_t           moo_obj_t;
 typedef struct moo_obj_t*          moo_oop_t;
 
@@ -916,6 +918,81 @@ struct moo_heap_t
 	moo_uint8_t* ptr;   /* next allocation pointer */
 };
 
+/* =========================================================================
+ * MOO VM LOGGING
+ * ========================================================================= */
+
+enum moo_log_mask_t
+{
+	MOO_LOG_DEBUG      = (1u << 0),
+	MOO_LOG_INFO       = (1u << 1),
+	MOO_LOG_WARN       = (1u << 2),
+	MOO_LOG_ERROR      = (1u << 3),
+	MOO_LOG_FATAL      = (1u << 4),
+
+	MOO_LOG_UNTYPED    = (1u << 6), /* only to be used by MOO_DEBUGx() and MOO_INFOx() */
+	MOO_LOG_COMPILER   = (1u << 7),
+	MOO_LOG_VM         = (1u << 8),
+	MOO_LOG_MNEMONIC   = (1u << 9), /* bytecode mnemonic */
+	MOO_LOG_GC         = (1u << 10),
+	MOO_LOG_IC         = (1u << 11), /* instruction cycle, fetch-decode-execute */
+	MOO_LOG_PRIMITIVE  = (1u << 12),
+	MOO_LOG_APP        = (1u << 13), /* moo applications, set by moo logging primitive */
+
+	MOO_LOG_ALL_LEVELS = (MOO_LOG_DEBUG  | MOO_LOG_INFO | MOO_LOG_WARN | MOO_LOG_ERROR | MOO_LOG_FATAL),
+	MOO_LOG_ALL_TYPES  = (MOO_LOG_UNTYPED | MOO_LOG_COMPILER | MOO_LOG_VM | MOO_LOG_MNEMONIC | MOO_LOG_GC | MOO_LOG_IC | MOO_LOG_PRIMITIVE | MOO_LOG_APP),
+
+
+	MOO_LOG_STDOUT     = (1u << 14), /* write log messages to stdout without timestamp. MOO_LOG_STDOUT wins over MOO_LOG_STDERR. */
+	MOO_LOG_STDERR     = (1u << 15)  /* write log messages to stderr without timestamp. */
+
+};
+typedef enum moo_log_mask_t moo_log_mask_t;
+
+typedef unsigned int moo_log_masks_t;
+
+/* all bits must be set to get enabled */
+#define MOO_LOG_ENABLED(moo,mask) (((moo)->option.log_mask & (mask)) == (mask))
+
+#define MOO_LOG0(moo,mask,fmt) do { if (MOO_LOG_ENABLED(moo,mask)) moo_logbfmt(moo, mask, fmt); } while(0)
+#define MOO_LOG1(moo,mask,fmt,a1) do { if (MOO_LOG_ENABLED(moo,mask)) moo_logbfmt(moo, mask, fmt, a1); } while(0)
+#define MOO_LOG2(moo,mask,fmt,a1,a2) do { if (MOO_LOG_ENABLED(moo,mask)) moo_logbfmt(moo, mask, fmt, a1, a2); } while(0)
+#define MOO_LOG3(moo,mask,fmt,a1,a2,a3) do { if (MOO_LOG_ENABLED(moo,mask)) moo_logbfmt(moo, mask, fmt, a1, a2, a3); } while(0)
+#define MOO_LOG4(moo,mask,fmt,a1,a2,a3,a4) do { if (MOO_LOG_ENABLED(moo,mask)) moo_logbfmt(moo, mask, fmt, a1, a2, a3, a4); } while(0)
+#define MOO_LOG5(moo,mask,fmt,a1,a2,a3,a4,a5) do { if (MOO_LOG_ENABLED(moo,mask)) moo_logbfmt(moo, mask, fmt, a1, a2, a3, a4, a5); } while(0)
+#define MOO_LOG6(moo,mask,fmt,a1,a2,a3,a4,a5,a6) do { if (MOO_LOG_ENABLED(moo,mask)) moo_logbfmt(moo, mask, fmt, a1, a2, a3, a4, a5, a6); } while(0)
+
+#if defined(MOO_BUILD_RELEASE)
+	/* [NOTE]
+	 *  get rid of debugging message totally regardless of
+	 *  the log mask in the release build.
+	 */
+#	define MOO_DEBUG0(moo,fmt)
+#	define MOO_DEBUG1(moo,fmt,a1)
+#	define MOO_DEBUG2(moo,fmt,a1,a2)
+#	define MOO_DEBUG3(moo,fmt,a1,a2,a3)
+#	define MOO_DEBUG4(moo,fmt,a1,a2,a3,a4)
+#	define MOO_DEBUG5(moo,fmt,a1,a2,a3,a4,a5)
+#	define MOO_DEBUG6(moo,fmt,a1,a2,a3,a4,a5,a6)
+#else
+#	define MOO_DEBUG0(moo,fmt) MOO_LOG0(moo, MOO_LOG_DEBUG | MOO_LOG_UNTYPED, fmt)
+#	define MOO_DEBUG1(moo,fmt,a1) MOO_LOG1(moo, MOO_LOG_DEBUG | MOO_LOG_UNTYPED, fmt, a1)
+#	define MOO_DEBUG2(moo,fmt,a1,a2) MOO_LOG2(moo, MOO_LOG_DEBUG | MOO_LOG_UNTYPED, fmt, a1, a2)
+#	define MOO_DEBUG3(moo,fmt,a1,a2,a3) MOO_LOG3(moo, MOO_LOG_DEBUG | MOO_LOG_UNTYPED, fmt, a1, a2, a3)
+#	define MOO_DEBUG4(moo,fmt,a1,a2,a3,a4) MOO_LOG4(moo, MOO_LOG_DEBUG | MOO_LOG_UNTYPED, fmt, a1, a2, a3, a4)
+#	define MOO_DEBUG5(moo,fmt,a1,a2,a3,a4,a5) MOO_LOG5(moo, MOO_LOG_DEBUG | MOO_LOG_UNTYPED, fmt, a1, a2, a3, a4, a5)
+#	define MOO_DEBUG6(moo,fmt,a1,a2,a3,a4,a5,a6) MOO_LOG6(moo, MOO_LOG_DEBUG | MOO_LOG_UNTYPED, fmt, a1, a2, a3, a4, a5, a6)
+#endif
+
+#define MOO_INFO0(moo,fmt) MOO_LOG0(moo, MOO_LOG_INFO | MOO_LOG_UNTYPED, fmt)
+#define MOO_INFO1(moo,fmt,a1) MOO_LOG1(moo, MOO_LOG_INFO | MOO_LOG_UNTYPED, fmt, a1)
+#define MOO_INFO2(moo,fmt,a1,a2) MOO_LOG2(moo, MOO_LOG_INFO | MOO_LOG_UNTYPED, fmt, a1, a2)
+#define MOO_INFO3(moo,fmt,a1,a2,a3) MOO_LOG3(moo, MOO_LOG_INFO | MOO_LOG_UNTYPED, fmt, a1, a2, a3)
+#define MOO_INFO4(moo,fmt,a1,a2,a3,a4) MOO_LOG4(moo, MOO_LOG_INFO | MOO_LOG_UNTYPED, fmt, a1, a2, a3, a4)
+#define MOO_INFO5(moo,fmt,a1,a2,a3,a4,a5) MOO_LOG5(moo, MOO_LOG_INFO | MOO_LOG_UNTYPED, fmt, a1, a2, a3, a4, a5)
+#define MOO_INFO6(moo,fmt,a1,a2,a3,a4,a5,a6) MOO_LOG6(moo, MOO_LOG_INFO | MOO_LOG_UNTYPED, fmt, a1, a2, a3, a4, a5, a6)
+
+
 /* =========================================================================
  * VIRTUAL MACHINE PRIMITIVES
  * ========================================================================= */
@@ -932,7 +1009,7 @@ typedef void (*moo_free_heap_t) (
 
 typedef void (*moo_log_write_t) (
 	moo_t*             moo,
-	moo_oow_t          mask,
+	moo_log_masks_t    mask,
 	const moo_ooch_t*  msg,
 	moo_oow_t          len
 );
@@ -1235,8 +1312,8 @@ struct moo_t
 
 	struct
 	{
-		unsigned int trait;
-		unsigned int log_mask;
+		moo_traits_t trait;
+		moo_log_masks_t log_mask;
 		moo_oow_t log_maxcapa;
 		moo_oow_t dfl_symtab_size;
 		moo_oow_t dfl_sysdic_size;
@@ -1260,8 +1337,8 @@ struct moo_t
 		moo_ooch_t* ptr;
 		moo_oow_t len;
 		moo_oow_t capa;
-		int last_mask;
-		int default_type_mask;
+		moo_log_masks_t last_mask;
+		moo_log_masks_t default_type_mask;
 	} log;
 
 	/* ========================= */
@@ -1477,79 +1554,6 @@ struct moo_t
 #define MOO_STACK_SETRETTOERRNUM(moo,nargs) MOO_STACK_SETRET(moo, nargs, MOO_ERROR_TO_OOP(moo->errnum))
 #define MOO_STACK_SETRETTOERROR(moo,nargs,ec) MOO_STACK_SETRET(moo, nargs, MOO_ERROR_TO_OOP(ec))
 
-/* =========================================================================
- * MOO VM LOGGING
- * ========================================================================= */
-
-enum moo_log_mask_t
-{
-	MOO_LOG_DEBUG      = (1 << 0),
-	MOO_LOG_INFO       = (1 << 1),
-	MOO_LOG_WARN       = (1 << 2),
-	MOO_LOG_ERROR      = (1 << 3),
-	MOO_LOG_FATAL      = (1 << 4),
-
-	MOO_LOG_UNTYPED    = (1 << 6), /* only to be used by MOO_DEBUGx() and MOO_INFOx() */
-	MOO_LOG_COMPILER   = (1 << 7),
-	MOO_LOG_VM         = (1 << 8),
-	MOO_LOG_MNEMONIC   = (1 << 9), /* bytecode mnemonic */
-	MOO_LOG_GC         = (1 << 10),
-	MOO_LOG_IC         = (1 << 11), /* instruction cycle, fetch-decode-execute */
-	MOO_LOG_PRIMITIVE  = (1 << 12),
-	MOO_LOG_APP        = (1 << 13), /* moo applications, set by moo logging primitive */
-
-	MOO_LOG_ALL_LEVELS = (MOO_LOG_DEBUG  | MOO_LOG_INFO | MOO_LOG_WARN | MOO_LOG_ERROR | MOO_LOG_FATAL),
-	MOO_LOG_ALL_TYPES  = (MOO_LOG_UNTYPED | MOO_LOG_COMPILER | MOO_LOG_VM | MOO_LOG_MNEMONIC | MOO_LOG_GC | MOO_LOG_IC | MOO_LOG_PRIMITIVE | MOO_LOG_APP),
-
-
-	MOO_LOG_STDOUT     = (1 << 14), /* write log messages to stdout without timestamp. MOO_LOG_STDOUT wins over MOO_LOG_STDERR. */
-	MOO_LOG_STDERR     = (1 << 15)  /* write log messages to stderr without timestamp. */
-
-};
-typedef enum moo_log_mask_t moo_log_mask_t;
-
-/* all bits must be set to get enabled */
-#define MOO_LOG_ENABLED(moo,mask) (((moo)->option.log_mask & (mask)) == (mask))
-
-#define MOO_LOG0(moo,mask,fmt) do { if (MOO_LOG_ENABLED(moo,mask)) moo_logbfmt(moo, mask, fmt); } while(0)
-#define MOO_LOG1(moo,mask,fmt,a1) do { if (MOO_LOG_ENABLED(moo,mask)) moo_logbfmt(moo, mask, fmt, a1); } while(0)
-#define MOO_LOG2(moo,mask,fmt,a1,a2) do { if (MOO_LOG_ENABLED(moo,mask)) moo_logbfmt(moo, mask, fmt, a1, a2); } while(0)
-#define MOO_LOG3(moo,mask,fmt,a1,a2,a3) do { if (MOO_LOG_ENABLED(moo,mask)) moo_logbfmt(moo, mask, fmt, a1, a2, a3); } while(0)
-#define MOO_LOG4(moo,mask,fmt,a1,a2,a3,a4) do { if (MOO_LOG_ENABLED(moo,mask)) moo_logbfmt(moo, mask, fmt, a1, a2, a3, a4); } while(0)
-#define MOO_LOG5(moo,mask,fmt,a1,a2,a3,a4,a5) do { if (MOO_LOG_ENABLED(moo,mask)) moo_logbfmt(moo, mask, fmt, a1, a2, a3, a4, a5); } while(0)
-#define MOO_LOG6(moo,mask,fmt,a1,a2,a3,a4,a5,a6) do { if (MOO_LOG_ENABLED(moo,mask)) moo_logbfmt(moo, mask, fmt, a1, a2, a3, a4, a5, a6); } while(0)
-
-#if defined(MOO_BUILD_RELEASE)
-	/* [NOTE]
-	 *  get rid of debugging message totally regardless of
-	 *  the log mask in the release build.
-	 */
-#	define MOO_DEBUG0(moo,fmt)
-#	define MOO_DEBUG1(moo,fmt,a1)
-#	define MOO_DEBUG2(moo,fmt,a1,a2)
-#	define MOO_DEBUG3(moo,fmt,a1,a2,a3)
-#	define MOO_DEBUG4(moo,fmt,a1,a2,a3,a4)
-#	define MOO_DEBUG5(moo,fmt,a1,a2,a3,a4,a5)
-#	define MOO_DEBUG6(moo,fmt,a1,a2,a3,a4,a5,a6)
-#else
-#	define MOO_DEBUG0(moo,fmt) MOO_LOG0(moo, MOO_LOG_DEBUG | MOO_LOG_UNTYPED, fmt)
-#	define MOO_DEBUG1(moo,fmt,a1) MOO_LOG1(moo, MOO_LOG_DEBUG | MOO_LOG_UNTYPED, fmt, a1)
-#	define MOO_DEBUG2(moo,fmt,a1,a2) MOO_LOG2(moo, MOO_LOG_DEBUG | MOO_LOG_UNTYPED, fmt, a1, a2)
-#	define MOO_DEBUG3(moo,fmt,a1,a2,a3) MOO_LOG3(moo, MOO_LOG_DEBUG | MOO_LOG_UNTYPED, fmt, a1, a2, a3)
-#	define MOO_DEBUG4(moo,fmt,a1,a2,a3,a4) MOO_LOG4(moo, MOO_LOG_DEBUG | MOO_LOG_UNTYPED, fmt, a1, a2, a3, a4)
-#	define MOO_DEBUG5(moo,fmt,a1,a2,a3,a4,a5) MOO_LOG5(moo, MOO_LOG_DEBUG | MOO_LOG_UNTYPED, fmt, a1, a2, a3, a4, a5)
-#	define MOO_DEBUG6(moo,fmt,a1,a2,a3,a4,a5,a6) MOO_LOG6(moo, MOO_LOG_DEBUG | MOO_LOG_UNTYPED, fmt, a1, a2, a3, a4, a5, a6)
-#endif
-
-#define MOO_INFO0(moo,fmt) MOO_LOG0(moo, MOO_LOG_INFO | MOO_LOG_UNTYPED, fmt)
-#define MOO_INFO1(moo,fmt,a1) MOO_LOG1(moo, MOO_LOG_INFO | MOO_LOG_UNTYPED, fmt, a1)
-#define MOO_INFO2(moo,fmt,a1,a2) MOO_LOG2(moo, MOO_LOG_INFO | MOO_LOG_UNTYPED, fmt, a1, a2)
-#define MOO_INFO3(moo,fmt,a1,a2,a3) MOO_LOG3(moo, MOO_LOG_INFO | MOO_LOG_UNTYPED, fmt, a1, a2, a3)
-#define MOO_INFO4(moo,fmt,a1,a2,a3,a4) MOO_LOG4(moo, MOO_LOG_INFO | MOO_LOG_UNTYPED, fmt, a1, a2, a3, a4)
-#define MOO_INFO5(moo,fmt,a1,a2,a3,a4,a5) MOO_LOG5(moo, MOO_LOG_INFO | MOO_LOG_UNTYPED, fmt, a1, a2, a3, a4, a5)
-#define MOO_INFO6(moo,fmt,a1,a2,a3,a4,a5,a6) MOO_LOG6(moo, MOO_LOG_INFO | MOO_LOG_UNTYPED, fmt, a1, a2, a3, a4, a5, a6)
-
-
 /* =========================================================================
  * MOO ASSERTION
  * ========================================================================= */
@@ -2187,14 +2191,14 @@ MOO_EXPORT moo_bch_t* moo_dupbchars (
 
 MOO_EXPORT moo_ooi_t moo_logbfmt (
 	moo_t*           moo,
-	moo_oow_t        mask,
+	moo_log_mask_t   mask,
 	const moo_bch_t* fmt,
 	...
 );
 
 MOO_EXPORT moo_ooi_t moo_logufmt (
 	moo_t*            moo,
-	moo_oow_t         mask,
+	moo_log_mask_t    mask,
 	const moo_uch_t*  fmt,
 	...
 );
diff --git a/moo/mod/Makefile.in b/moo/mod/Makefile.in
index 0902ff8..b74f889 100644
--- a/moo/mod/Makefile.in
+++ b/moo/mod/Makefile.in
@@ -424,7 +424,6 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
-runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@