diff --git a/qse/configure.ac b/qse/configure.ac
index 0db36788..8546f705 100644
--- a/qse/configure.ac
+++ b/qse/configure.ac
@@ -1,7 +1,7 @@
 
-dnl AC_PREREQ(2.59)
+dnl AC_PREREQ([2.67])
 
-AC_INIT([qse],[0.5.5],[Chung, Hyung-Hwan (hyunghwan.chung@gmail.com)],,[http://code.abiyo.net/@qse])
+AC_INIT([qse],[0.5.5],[Chung, Hyung-Hwan (hyunghwan.chung@gmail.com)],[],[http://code.abiyo.net/@qse])
 AC_CONFIG_HEADER([include/qse/config.h])
 AC_CONFIG_AUX_DIR([ac])
 AC_CONFIG_MACRO_DIR([m4])
@@ -36,7 +36,7 @@ dnl avoid "'/bin/rm: cannot remove `libtoolT': No such file or directory"
 RM="$RM -f"
 
 dnl initialize libtool
-AC_PROG_LIBTOOL
+LT_INIT
 AC_SUBST(LIBTOOL_DEPS)
 
 dnl overrides the default CFLAGS setting
@@ -73,7 +73,7 @@ esac
 AM_CONDITIONAL(WIN32, test "${platform_win32}" = "yes" )
 
 dnl check the math library (check if -lm is needed)
-AC_CHECK_LIBM
+LT_LIB_M
 AC_SUBST(LIBM, $LIBM)
 
 dnl check header files.
@@ -166,8 +166,7 @@ AC_C_BIGENDIAN(
 	[AC_DEFINE([QSE_ENDIAN_UNKNOWN],[],[Unknown Endian])])
 
 dnl define extra options
-AC_ARG_ENABLE([wchar], [AC_HELP_STRING([--enable-wchar],
-	[use wchar_t a default charater type when enabled (default. yes)])],
+AC_ARG_ENABLE([wchar], [AS_HELP_STRING([--enable-wchar],[use wchar_t a default charater type when enabled (default. yes)])],
 	enable_wchar_is=$enableval,enable_wchar_is=yes)
 test "${ac_cv_sizeof_wchar_t}" = "0" && enable_wchar_is=no
 if test "${enable_wchar_is}" = "yes"
@@ -179,16 +178,14 @@ else
 	AC_SUBST(CHAR_MODE, "QSE_CHAR_IS_MCHAR")
 fi
 
-AC_ARG_ENABLE([syscall], [AC_HELP_STRING([--enable-syscall],
-	[use the syscall() function to call system calls (default. no)])],
+AC_ARG_ENABLE([syscall], [AS_HELP_STRING([--enable-syscall],[use the syscall() function to call system calls (default. no)])],
 	enable_syscall_is=$enableval,enable_syscall_is=no)
 if test "${enable_syscall_is}" = "yes"
 then
 	AC_DEFINE([QSE_USE_SYSCALL],[],[use the syscall() function to invoke a system call])
 fi
 
-AC_ARG_ENABLE([debug], [AC_HELP_STRING([--enable-debug],
-	[build the library in the debug mode (default. no)])],
+AC_ARG_ENABLE([debug], [AS_HELP_STRING([--enable-debug],[build the library in the debug mode (default. no)])],
 	enable_debug_is=$enableval,enable_debug_is=no)
 if test "$enable_debug_is" = "yes"
 then
@@ -201,15 +198,13 @@ else
 	AC_SUBST(BUILD_MODE, "release")
 fi
 
-AC_ARG_ENABLE([cxx], [AC_HELP_STRING([--enable-cxx],
-	[build the library for C++ if a C++ compiler is available (default. yes)])],
+AC_ARG_ENABLE([cxx], [AS_HELP_STRING([--enable-cxx],[build the library for C++ if a C++ compiler is available (default. yes)])],
 	enable_cxx_is=$enableval,enable_cxx_is=yes) 
 [test "${HAVE_CXX}" = "yes" || enable_cxx_is="no"]
 AM_CONDITIONAL(ENABLE_CXX, test "${enable_cxx_is}" = "yes" )
 
 # configure makefiles
-AC_ARG_ENABLE([reentrant], [AC_HELP_STRING([--enable-reentrant],
-	[define _REENTRANT (default. yes)])],
+AC_ARG_ENABLE([reentrant], [AS_HELP_STRING([--enable-reentrant],[define _REENTRANT (default. yes)])],
 	enable_reentrant_is=$enableval,enable_reentrant_is=yes)
 if test "$enable_reentrant_is" = "yes"
 then
diff --git a/qse/include/qse/cmn/main.h b/qse/include/qse/cmn/main.h
index 3a43b835..6d56941c 100644
--- a/qse/include/qse/cmn/main.h
+++ b/qse/include/qse/cmn/main.h
@@ -55,6 +55,22 @@
 	typedef qse_mchar_t qse_achar_t;
 #endif
 
+/**
+ * The qse_runmain_handler_t type defines the actual function to be
+ * executed by qse_runmain(). Unlike the standard main(), it is passed
+ * arguments in the #qse_char_t type.
+ */
+typedef int (*qse_runmain_handler_t) (
+	int         argc,
+	qse_char_t* argv[]
+);
+
+typedef int (*qse_runmainwithenv_handler_t) (
+	int         argc,
+	qse_char_t* argv[],
+	qse_char_t* envp[]
+);
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -64,12 +80,25 @@ extern "C" {
  * the character mode configured for the library.
  */
 int qse_runmain (
-	int          argc, 
-	qse_achar_t* argv[],
-	int        (*mf)(int,qse_char_t*[])
+	int                   argc,
+	qse_achar_t*          argv[],
+	qse_runmain_handler_t handler
 );
 
-/* TODO - qse_runmain with env, namely, qse_runmaine */
+/**
+ * The qse_runmainwithenv() function helps to invoke a main function 
+ * independent of the character mode configured for the library providing
+ * the enviroment list.
+ */
+int qse_runmainwithenv (
+	int                          argc,
+	qse_achar_t*                 argv[],
+	qse_achar_t*                 envp[],
+	qse_runmainwithenv_handler_t handler
+);
+
+/* TODO: support more weird main functions. for example,
+ *  int main(int argc, char **argv, char **envp, char **apple) in Mac OS X */
 
 #ifdef __cplusplus
 }
diff --git a/qse/lib/cmn/main.c b/qse/lib/cmn/main.c
index 9ab61f09..b2fff962 100644
--- a/qse/lib/cmn/main.c
+++ b/qse/lib/cmn/main.c
@@ -23,84 +23,138 @@
 #include <locale.h>
 #include "mem.h"
 
-#if defined(_WIN32) && !defined(__MINGW32__)
-
-int qse_runmain (int argc, qse_achar_t* argv[], int(*mf) (int,qse_char_t*[]))
+int qse_runmain (
+	int argc, qse_achar_t* argv[], qse_runmain_handler_t handler)
 {
-	return mf (argc, argv);
-}
+	setlocale (LC_ALL, ""); /* TODO: remove dependency on setlocale */
 
-#elif defined(QSE_CHAR_IS_WCHAR)
-
-int qse_runmain (int argc, qse_achar_t* argv[], int(*mf) (int,qse_char_t*[]))
-{
-	int i, ret;
-	qse_char_t** v;
-	qse_mmgr_t* mmgr = QSE_MMGR_GETDFL ();
-
-	setlocale (LC_ALL, "");
-
-	v = (qse_char_t**) QSE_MMGR_ALLOC (
-		mmgr, argc * QSE_SIZEOF(qse_char_t*));
-	if (v == QSE_NULL) return -1;
-
-	for (i = 0; i < argc; i++) v[i] = QSE_NULL;
-
-	for (i = 0; i < argc; i++) 
+	if (QSE_SIZEOF(qse_achar_t) == QSE_SIZEOF(qse_char_t))
 	{
-		qse_size_t n, len, nlen;
-		qse_size_t mbslen;
-
-		mbslen = qse_mbslen (argv[i]);
-
-		n = qse_mbstowcslen (argv[i], &len);
-		if (n < mbslen)
-		{
-			ret = -1; goto oops;
-		}
-
-		len++; /* include the terminating null */
-
-		v[i] = (qse_char_t*) QSE_MMGR_ALLOC (
-			mmgr, len*QSE_SIZEOF(qse_char_t));
-		if (v[i] == QSE_NULL) 
-		{
-			ret = -1; goto oops;
-		}
-
-		nlen = len;
-		n = qse_mbstowcs (argv[i], v[i], &nlen);
-		if (nlen >= len)
-		{
-			/* no null-termination */
-			ret = -1; goto oops;
-		}
-		if (argv[i][n] != '\0')
-		{		
-			/* partial processing */
-			ret = -1; goto oops;
-		}
+		return handler (argc, (qse_char_t**)argv);
 	}
-
-	/* TODO: envp... */
-	//ret = mf (argc, v, QSE_NULL);
-	ret = mf (argc, v);
-
-oops:
-	for (i = 0; i < argc; i++) 
+	else
 	{
-		if (v[i] != QSE_NULL) QSE_MMGR_FREE (mmgr, v[i]);
+		int i, ret;
+		qse_char_t** v;
+		qse_mmgr_t* mmgr = QSE_MMGR_GETDFL ();
+
+		v = (qse_char_t**) QSE_MMGR_ALLOC (
+			mmgr, (argc + 1) * QSE_SIZEOF(qse_char_t*));
+		if (v == QSE_NULL) return -1;
+
+		for (i = 0; i < argc + 1; i++) v[i] = QSE_NULL;
+
+		for (i = 0; i < argc; i++)
+		{
+			qse_size_t n, len, nlen;
+			qse_size_t mbslen;
+
+			mbslen = qse_mbslen (argv[i]);
+
+			n = qse_mbstowcslen (argv[i], &len);
+			if (n < mbslen)	{ ret = -1; goto oops; }
+
+			len++; /* include the terminating null */
+
+			v[i] = (qse_char_t*) QSE_MMGR_ALLOC (
+				mmgr, len*QSE_SIZEOF(qse_char_t));
+			if (v[i] == QSE_NULL) { ret = -1; goto oops; }
+
+			nlen = len;
+			n = qse_mbstowcs (argv[i], v[i], &nlen);
+			if (nlen >= len)
+			{
+				/* no null-termination */
+				ret = -1; goto oops;
+			}
+			if (argv[i][n] != '\0')
+			{
+				/* partial processing */
+				ret = -1; goto oops;
+			}
+		}
+
+		ret = handler (argc, v);
+
+	oops:
+		for (i = 0; i < argc + 1; i++)
+		{
+			if (v[i] != QSE_NULL) QSE_MMGR_FREE (mmgr, v[i]);
+		}
+		QSE_MMGR_FREE (mmgr, v);
+
+		return ret;
 	}
-	QSE_MMGR_FREE (mmgr, v);
-
-	return ret;
 }
 
-#else
-
-int qse_runmain (int argc, qse_achar_t* argv[], int(*mf) (int,qse_char_t*[]))
+int qse_runmainwithenv (
+	int argc, qse_achar_t* argv[], 
+	qse_achar_t* envp[], qse_runmainwithenv_handler_t handler)
 {
-	return mf (argc, argv);
-}
+	setlocale (LC_ALL, ""); /* TODO: remove dependency on setlocale */
 
-#endif
+	if (QSE_SIZEOF(qse_achar_t) == QSE_SIZEOF(qse_char_t))
+	{
+		return handler (argc, (qse_char_t**)argv, (qse_char_t**)envp);
+	}
+	else
+	{
+		int i, ret, envc;
+		qse_char_t** v;
+		qse_mmgr_t* mmgr = QSE_MMGR_GETDFL ();
+
+		for (envc = 0; envp[envc]; envc++) ; /* count the number of env items */
+
+		v = (qse_char_t**) QSE_MMGR_ALLOC (
+			mmgr, (argc + 1 + envc + 1) * QSE_SIZEOF(qse_char_t*));
+		if (v == QSE_NULL) return -1;
+
+		for (i = 0; i < argc + 1 + envc + 1; i++) v[i] = QSE_NULL;
+
+		for (i = 0; i < argc + 1 + envc; i++)
+		{
+			qse_size_t n, len, nlen;
+			qse_size_t mbslen;
+			qse_achar_t* x;
+
+			if (i < argc) x = argv[i];
+			else if (i == argc) continue;
+			else x = envp[i - argc - 1];
+		
+			mbslen = qse_mbslen (x);
+
+			n = qse_mbstowcslen (x, &len);
+			if (n < mbslen) { ret = -1; goto oops; }
+
+			len++; /* include the terminating null */
+
+			v[i] = (qse_char_t*) QSE_MMGR_ALLOC (
+				mmgr, len*QSE_SIZEOF(qse_char_t));
+			if (v[i] == QSE_NULL) { ret = -1; goto oops; }
+
+			nlen = len;
+			n = qse_mbstowcs (x, v[i], &nlen);
+			if (nlen >= len)
+			{
+				/* no null-termination */
+				ret = -1; goto oops;
+			}
+			if (x[n] != '\0')
+			{
+				/* partial processing */
+				ret = -1; goto oops;
+			}
+		}
+
+		ret = handler (argc, v, &v[argc + 1]);
+
+	oops:
+		for (i = 0; i < argc + 1 + envc + 1; i++)
+		{
+			if (v[i] != QSE_NULL) QSE_MMGR_FREE (mmgr, v[i]);
+		}
+		QSE_MMGR_FREE (mmgr, v);
+
+		return ret;
+	}
+}
diff --git a/qse/samples/cmn/Makefile.am b/qse/samples/cmn/Makefile.am
index ffaacf32..fa2f34e7 100644
--- a/qse/samples/cmn/Makefile.am
+++ b/qse/samples/cmn/Makefile.am
@@ -6,7 +6,7 @@ AM_CPPFLAGS = \
 	-I$(includedir)
 
 
-bin_PROGRAMS = xma fma chr str sll dll lda oht htb rbt fio pio sio time main rex01 
+bin_PROGRAMS = xma fma chr str sll dll lda oht htb rbt fio pio sio time main main2 rex01 
 
 LDFLAGS = -L../../lib/cmn 
 LDADD = -lqsecmn 
@@ -26,6 +26,7 @@ pio_SOURCES = pio.c
 sio_SOURCES = sio.c
 time_SOURCES = time.c
 main_SOURCES = main.c
+main2_SOURCES = main2.c
 rex01_SOURCES = rex01.c
 
 if ENABLE_CXX
diff --git a/qse/samples/cmn/Makefile.in b/qse/samples/cmn/Makefile.in
index b479ad87..c41df617 100644
--- a/qse/samples/cmn/Makefile.in
+++ b/qse/samples/cmn/Makefile.in
@@ -37,7 +37,8 @@ host_triplet = @host@
 bin_PROGRAMS = xma$(EXEEXT) fma$(EXEEXT) chr$(EXEEXT) str$(EXEEXT) \
 	sll$(EXEEXT) dll$(EXEEXT) lda$(EXEEXT) oht$(EXEEXT) \
 	htb$(EXEEXT) rbt$(EXEEXT) fio$(EXEEXT) pio$(EXEEXT) \
-	sio$(EXEEXT) time$(EXEEXT) main$(EXEEXT) rex01$(EXEEXT)
+	sio$(EXEEXT) time$(EXEEXT) main$(EXEEXT) main2$(EXEEXT) \
+	rex01$(EXEEXT)
 subdir = samples/cmn
 DIST_COMMON = $(srcdir)/Makefile.am $(srcdir)/Makefile.in
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
@@ -81,6 +82,10 @@ am_main_OBJECTS = main.$(OBJEXT)
 main_OBJECTS = $(am_main_OBJECTS)
 main_LDADD = $(LDADD)
 main_DEPENDENCIES =
+am_main2_OBJECTS = main2.$(OBJEXT)
+main2_OBJECTS = $(am_main2_OBJECTS)
+main2_LDADD = $(LDADD)
+main2_DEPENDENCIES =
 am_oht_OBJECTS = oht.$(OBJEXT)
 oht_OBJECTS = $(am_oht_OBJECTS)
 oht_LDADD = $(LDADD)
@@ -131,14 +136,15 @@ LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
 	--mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) \
 	$(LDFLAGS) -o $@
 SOURCES = $(chr_SOURCES) $(dll_SOURCES) $(fio_SOURCES) $(fma_SOURCES) \
-	$(htb_SOURCES) $(lda_SOURCES) $(main_SOURCES) $(oht_SOURCES) \
-	$(pio_SOURCES) $(rbt_SOURCES) $(rex01_SOURCES) $(sio_SOURCES) \
-	$(sll_SOURCES) $(str_SOURCES) $(time_SOURCES) $(xma_SOURCES)
-DIST_SOURCES = $(chr_SOURCES) $(dll_SOURCES) $(fio_SOURCES) \
-	$(fma_SOURCES) $(htb_SOURCES) $(lda_SOURCES) $(main_SOURCES) \
+	$(htb_SOURCES) $(lda_SOURCES) $(main_SOURCES) $(main2_SOURCES) \
 	$(oht_SOURCES) $(pio_SOURCES) $(rbt_SOURCES) $(rex01_SOURCES) \
 	$(sio_SOURCES) $(sll_SOURCES) $(str_SOURCES) $(time_SOURCES) \
 	$(xma_SOURCES)
+DIST_SOURCES = $(chr_SOURCES) $(dll_SOURCES) $(fio_SOURCES) \
+	$(fma_SOURCES) $(htb_SOURCES) $(lda_SOURCES) $(main_SOURCES) \
+	$(main2_SOURCES) $(oht_SOURCES) $(pio_SOURCES) $(rbt_SOURCES) \
+	$(rex01_SOURCES) $(sio_SOURCES) $(sll_SOURCES) $(str_SOURCES) \
+	$(time_SOURCES) $(xma_SOURCES)
 ETAGS = etags
 CTAGS = ctags
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
@@ -301,6 +307,7 @@ pio_SOURCES = pio.c
 sio_SOURCES = sio.c
 time_SOURCES = time.c
 main_SOURCES = main.c
+main2_SOURCES = main2.c
 rex01_SOURCES = rex01.c
 all: all-am
 
@@ -400,6 +407,9 @@ lda$(EXEEXT): $(lda_OBJECTS) $(lda_DEPENDENCIES)
 main$(EXEEXT): $(main_OBJECTS) $(main_DEPENDENCIES) 
 	@rm -f main$(EXEEXT)
 	$(LINK) $(main_OBJECTS) $(main_LDADD) $(LIBS)
+main2$(EXEEXT): $(main2_OBJECTS) $(main2_DEPENDENCIES) 
+	@rm -f main2$(EXEEXT)
+	$(LINK) $(main2_OBJECTS) $(main2_LDADD) $(LIBS)
 oht$(EXEEXT): $(oht_OBJECTS) $(oht_DEPENDENCIES) 
 	@rm -f oht$(EXEEXT)
 	$(LINK) $(oht_OBJECTS) $(oht_LDADD) $(LIBS)
@@ -441,6 +451,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/htb.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/lda.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/main.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/main2.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/oht.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pio.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/rbt.Po@am__quote@
diff --git a/qse/samples/cmn/main2.c b/qse/samples/cmn/main2.c
new file mode 100644
index 00000000..397fe02e
--- /dev/null
+++ b/qse/samples/cmn/main2.c
@@ -0,0 +1,25 @@
+#include <qse/cmn/main.h>
+#include <qse/cmn/stdio.h>
+
+static int test_main (int argc, qse_char_t* argv[], qse_char_t* envp[])
+{
+	int i;
+
+	for (i = 0; i < argc; i++)
+	{
+		qse_printf (QSE_T("%d => [%s]\n"), i, argv[i]);
+	}
+
+	for (i = 0; envp[i]; i++)
+	{
+		qse_printf (QSE_T("%d => [%s]\n"), i, envp[i]);
+	}
+
+	return 0;
+}
+
+int qse_main (int argc, qse_achar_t* argv[], qse_achar_t* envp[])
+{
+	return qse_runmainwithenv (argc, argv, envp, test_main);
+}
+