diff --git a/moo/Makefile.am b/moo/Makefile.am
index 5734901..379ce8b 100644
--- a/moo/Makefile.am
+++ b/moo/Makefile.am
@@ -3,10 +3,16 @@ ACLOCAL_AMFLAGS = -I m4
 
 EXTRA_DIST =
 
-if ENABLE_STATIC_MODULE
-SUBDIRS = libltdl mod lib
+if ENABLE_LIBLTDL
+SUBDIRS = libltdl
 else
-SUBDIRS = libltdl lib mod
+SUBDIRS = 
+endif
+
+if ENABLE_STATIC_MODULE
+SUBDIRS += mod lib
+else
+SUBDIRS += lib mod
 endif
 
 DIST_SUBDIRS = $(SUBDIRS) 
diff --git a/moo/Makefile.in b/moo/Makefile.in
index 44d6323..0d684ae 100644
--- a/moo/Makefile.in
+++ b/moo/Makefile.in
@@ -87,6 +87,8 @@ PRE_UNINSTALL = :
 POST_UNINSTALL = :
 build_triplet = @build@
 host_triplet = @host@
+@ENABLE_STATIC_MODULE_TRUE@am__append_1 = mod lib
+@ENABLE_STATIC_MODULE_FALSE@am__append_2 = lib mod
 subdir = .
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/m4/ax_cxx_namespace.m4 \
@@ -372,8 +374,8 @@ top_srcdir = @top_srcdir@
 AUTOMAKE_OPTION = foreign
 ACLOCAL_AMFLAGS = -I m4
 EXTRA_DIST = 
-@ENABLE_STATIC_MODULE_FALSE@SUBDIRS = libltdl lib mod
-@ENABLE_STATIC_MODULE_TRUE@SUBDIRS = libltdl mod lib
+@ENABLE_LIBLTDL_FALSE@SUBDIRS = $(am__append_1) $(am__append_2)
+@ENABLE_LIBLTDL_TRUE@SUBDIRS = libltdl $(am__append_1) $(am__append_2)
 DIST_SUBDIRS = $(SUBDIRS) 
 all: all-recursive
 
diff --git a/moo/configure b/moo/configure
index 0055aae..37e6f08 100755
--- a/moo/configure
+++ b/moo/configure
@@ -656,6 +656,8 @@ MOO_SIZEOF_INT
 MOO_SIZEOF_LONG
 MOO_SIZEOF_LONG_LONG
 MOO_SIZEOF_WCHAR_T
+ENABLE_LIBLTDL_FALSE
+ENABLE_LIBLTDL_TRUE
 ENABLE_STATIC_MODULE_FALSE
 ENABLE_STATIC_MODULE_TRUE
 ENABLE_CXX_FALSE
@@ -831,6 +833,7 @@ enable_ltdl_install
 enable_debug
 enable_cxx
 enable_static_module
+enable_libltdl
 '
       ac_precious_vars='build_alias
 host_alias
@@ -1481,6 +1484,7 @@ Optional Features:
                           available (default. yes)
   --enable-static-module  build modules statically into the main
                           library(default. no)
+  --enable-libltdl        use libltdl(default. yes)
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -18386,6 +18390,7 @@ fi
 	LIBS="$save_LIBS"
 fi
 
+
 if test "$ac_test_CFLAGS" != "set"
 then
 	if test "$GCC" = "yes"
@@ -20565,7 +20570,6 @@ else
 
 fi
 
-
 test "${enable_shared}" = "no" -a "${enable_static}" = "yes" && enable_static_module_is="yes"
 
 if test "${enable_static_module_is}" = "yes"
@@ -20583,6 +20587,30 @@ else
 fi
 
 
+
+# Check whether --enable-libltdl was given.
+if test "${enable_libltdl+set}" = set; then :
+  enableval=$enable_libltdl; enable_libltdl_is=$enableval
+else
+  enable_libltdl_is=yes
+
+fi
+
+if test "${enable_libltdl_is}" = "yes"
+then
+
+$as_echo "#define MOO_ENABLE_LIBLTDL /**/" >>confdefs.h
+
+fi
+ if test "${enable_libltdl_is}" = "yes"; then
+  ENABLE_LIBLTDL_TRUE=
+  ENABLE_LIBLTDL_FALSE='#'
+else
+  ENABLE_LIBLTDL_TRUE='#'
+  ENABLE_LIBLTDL_FALSE=
+fi
+
+
 MOO_SIZEOF_WCHAR_T=$ac_cv_sizeof_wchar_t
 
 MOO_SIZEOF_LONG_LONG=$ac_cv_sizeof_long_long
@@ -20794,6 +20822,10 @@ if test -z "${ENABLE_STATIC_MODULE_TRUE}" && test -z "${ENABLE_STATIC_MODULE_FAL
   as_fn_error $? "conditional \"ENABLE_STATIC_MODULE\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
+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
 
 : "${CONFIG_STATUS=./config.status}"
 ac_write_fail=0
diff --git a/moo/configure.ac b/moo/configure.ac
index 1fa08a3..0101258 100644
--- a/moo/configure.ac
+++ b/moo/configure.ac
@@ -65,6 +65,7 @@ if test "x$with_included_ltdl" != "xyes"; then
 	LIBS="$save_LIBS"
 fi
 
+
 dnl overrides the default CFLAGS setting
 if test "$ac_test_CFLAGS" != "set"
 then
@@ -411,12 +412,12 @@ test "${ax_cv_cxx_have_std_namespace}" = "yes" || enable_cxx_is="no"
 
 AM_CONDITIONAL(ENABLE_CXX, test "${enable_cxx_is}" = "yes" )
 
+dnl ===== enable-static-module =====
 AC_ARG_ENABLE([static-module],
 	[AS_HELP_STRING([--enable-static-module],[build modules statically into the main library(default. no)])],
 	enable_static_module_is=$enableval,
 	enable_static_module_is=no
 )
-
 test "${enable_shared}" = "no" -a "${enable_static}" = "yes" && enable_static_module_is="yes"
 
 if test "${enable_static_module_is}" = "yes"
@@ -425,6 +426,19 @@ then
 fi
 AM_CONDITIONAL(ENABLE_STATIC_MODULE, test "${enable_static_module_is}" = "yes")
 
+
+dnl ===== enable-libltdl =====
+AC_ARG_ENABLE([libltdl],
+	[AS_HELP_STRING([--enable-libltdl],[use libltdl(default. yes)])],
+	enable_libltdl_is=$enableval,
+	enable_libltdl_is=yes
+)
+if test "${enable_libltdl_is}" = "yes"
+then
+	AC_DEFINE([MOO_ENABLE_LIBLTDL],[],[use libltdl])
+fi
+AM_CONDITIONAL(ENABLE_LIBLTDL, test "${enable_libltdl_is}" = "yes")
+
 AC_SUBST(MOO_SIZEOF_WCHAR_T, $ac_cv_sizeof_wchar_t)
 AC_SUBST(MOO_SIZEOF_LONG_LONG, $ac_cv_sizeof_long_long)
 AC_SUBST(MOO_SIZEOF_LONG, $ac_cv_sizeof_long)
diff --git a/moo/lib/comp.c b/moo/lib/comp.c
index 0e2f340..e358d7c 100644
--- a/moo/lib/comp.c
+++ b/moo/lib/comp.c
@@ -5039,11 +5039,11 @@ static int compile_while_expression (moo_t* moo)
 	}
 	else if (prebbpos < postbbpos)
 	{
-		/* emit code to pop the value pushed by the braced block */
+		/* emit an instruction to pop the value pushed by the braced block */
 		if (emit_byte_instruction (moo, BCODE_POP_STACKTOP) <= -1) goto oops;
 	}
 
-	/* emit code to jump back to the condition */
+	/* emit an instruction to jump back to the condition */
 	if (emit_backward_jump_instruction (moo, BCODE_JUMP_BACKWARD_0, moo->c->mth.code.len - precondpos) <= -1) 
 	{
 		if (moo->errnum == MOO_ERANGE) 
diff --git a/moo/lib/main.c b/moo/lib/main.c
index de4019a..3e0d5d3 100644
--- a/moo/lib/main.c
+++ b/moo/lib/main.c
@@ -36,7 +36,7 @@
 #if defined(_WIN32)
 #	include <windows.h>
 #	include <tchar.h>
-#	if defined(MOO_HAVE_CFG_H)
+#	if defined(MOO_HAVE_CFG_H) && defined(MOO_ENABLE_LIBLTDL)
 #		include <ltdl.h>
 #		define USE_LTDL
 #	endif
@@ -53,8 +53,13 @@
 #	include <Timer.h>
 #else
 #	include <unistd.h>
-#	include <ltdl.h>
-#	define USE_LTDL
+#	if defined(MOO_ENABLE_LIBLTDL)
+#		include <ltdl.h>
+#		define USE_LTDL
+#	else
+#		include <dlfcn.h>
+#		error NOT IMPLEMENTED
+#	endif
 
 #	if defined(HAVE_TIME_H)
 #		include <time.h>
diff --git a/moo/lib/moo-cfg.h.in b/moo/lib/moo-cfg.h.in
index e54e8a8..68778bb 100644
--- a/moo/lib/moo-cfg.h.in
+++ b/moo/lib/moo-cfg.h.in
@@ -323,6 +323,9 @@
 /* Define to the shared archive member specification, say "(shr.o)". */
 #undef LT_SHARED_LIB_MEMBER
 
+/* use libltdl */
+#undef MOO_ENABLE_LIBLTDL
+
 /* link modules statically into the main library */
 #undef MOO_ENABLE_STATIC_MODULE