diff --git a/Makefile.in b/Makefile.in
index 80c25ce..572b30e 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -272,6 +272,7 @@ LIBTOOL = @LIBTOOL@
 LIBTOOL_DEPS = @LIBTOOL_DEPS@
 LIPO = @LIPO@
 LN_S = @LN_S@
+LTDL_LIBS = @LTDL_LIBS@
 LTLIBOBJS = @LTLIBOBJS@
 LT_SYS_LIBRARY_PATH = @LT_SYS_LIBRARY_PATH@
 MAKEINFO = @MAKEINFO@
diff --git a/configure b/configure
index 6372c63..eb391fb 100755
--- a/configure
+++ b/configure
@@ -651,6 +651,8 @@ HCL_SIZEOF_LONG_LONG
 HCL_SIZEOF_CHAR32_T
 HCL_SIZEOF_CHAR16_T
 HCL_SIZEOF_WCHAR_T
+ENABLE_LIBLTDL_FALSE
+ENABLE_LIBLTDL_TRUE
 ENABLE_STATIC_MODULE_FALSE
 ENABLE_STATIC_MODULE_TRUE
 ENABLE_DYNAMIC_MODULE_FALSE
@@ -663,6 +665,7 @@ PACKAGE_VERSION_MINOR
 PACKAGE_VERSION_MAJOR
 QUADMATH_LIBS
 UNICOWS_LIBS
+LTDL_LIBS
 DL_LIBS
 LIBM
 WIN32_FALSE
@@ -807,6 +810,7 @@ enable_unicode
 enable_cxx
 enable_dynamic_module
 enable_static_module
+enable_libltdl
 '
       ac_precious_vars='build_alias
 host_alias
@@ -1460,6 +1464,7 @@ Optional Features:
   --enable-dynamic-module enable dynamic module capability(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]
@@ -17528,7 +17533,7 @@ fi
 
 done
 
-for ac_header in dlfcn.h sys/mman.h
+for ac_header in dlfcn.h ltdl.h sys/mman.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
@@ -17683,6 +17688,72 @@ fi
 LIBS="$save_LIBS"
 
 
+save_LIBS="$LIBS"
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing lt_dlopen" >&5
+$as_echo_n "checking for library containing lt_dlopen... " >&6; }
+if ${ac_cv_search_lt_dlopen+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_func_search_save_LIBS=$LIBS
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char lt_dlopen ();
+int
+main ()
+{
+return lt_dlopen ();
+  ;
+  return 0;
+}
+_ACEOF
+for ac_lib in '' ltdl; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_search_lt_dlopen=$ac_res
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext
+  if ${ac_cv_search_lt_dlopen+:} false; then :
+  break
+fi
+done
+if ${ac_cv_search_lt_dlopen+:} false; then :
+
+else
+  ac_cv_search_lt_dlopen=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_lt_dlopen" >&5
+$as_echo "$ac_cv_search_lt_dlopen" >&6; }
+ac_res=$ac_cv_search_lt_dlopen
+if test "$ac_res" != no; then :
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
+
+	LTDL_LIBS="$ac_cv_search_lt_dlopen"
+	if test "x${LTDL_LIBS}" = "xnone required"
+	then
+		LTDL_LIBS=""
+	fi
+
+fi
+
+LIBS="$save_LIBS"
+
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lunicows" >&5
 $as_echo_n "checking for main in -lunicows... " >&6; }
 if ${ac_cv_lib_unicows_main+:} false; then :
@@ -19543,6 +19614,34 @@ 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
+	if test "${ac_cv_header_ltdl_h}" = "yes"  -a "${LTDL_LIBS}" != ""
+	then
+
+$as_echo "#define HCL_ENABLE_LIBLTDL /**/" >>confdefs.h
+
+	else
+		enable_libltdl_is="no"
+	fi
+fi
+ if test "${enable_libltdl_is}" = "yes"; then
+  ENABLE_LIBLTDL_TRUE=
+  ENABLE_LIBLTDL_FALSE='#'
+else
+  ENABLE_LIBLTDL_TRUE='#'
+  ENABLE_LIBLTDL_FALSE=
+fi
+
+
 HCL_SIZEOF_WCHAR_T=$ac_cv_sizeof_wchar_t
 
 HCL_SIZEOF_CHAR16_T=$ac_cv_sizeof_char16_t
@@ -19737,6 +19836,10 @@ if test -z "${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/configure.ac b/configure.ac
index d61275c..e56cf83 100644
--- a/configure.ac
+++ b/configure.ac
@@ -117,7 +117,7 @@ dnl check header files.
 AC_HEADER_STDC
 AC_CHECK_HEADERS([stddef.h wchar.h wctype.h errno.h signal.h fcntl.h dirent.h])
 AC_CHECK_HEADERS([time.h sys/time.h utime.h spawn.h execinfo.h ucontext.h])
-AC_CHECK_HEADERS([dlfcn.h sys/mman.h])
+AC_CHECK_HEADERS([dlfcn.h ltdl.h sys/mman.h])
 
 dnl check data types
 dnl AC_CHECK_TYPE([wchar_t], 
@@ -146,6 +146,17 @@ AC_SEARCH_LIBS([dlopen], [dl dld], [
 LIBS="$save_LIBS"
 AC_SUBST(DL_LIBS)
 
+save_LIBS="$LIBS"
+AC_SEARCH_LIBS([lt_dlopen], [ltdl], [
+	LTDL_LIBS="$ac_cv_search_lt_dlopen"
+	if test "x${LTDL_LIBS}" = "xnone required"
+	then
+		LTDL_LIBS=""
+	fi
+])
+LIBS="$save_LIBS"
+AC_SUBST(LTDL_LIBS)
+
 dnl check is the import library for unicows.dll exists
 dnl this check doesn't look for a particular symbol
 dnl but for the symbol 'main' since i want to check 
@@ -479,6 +490,23 @@ 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
+	if test "${ac_cv_header_ltdl_h}" = "yes"  -a "${LTDL_LIBS}" != ""
+	then
+		AC_DEFINE([HCL_ENABLE_LIBLTDL],[],[use libltdl when loading a dynamic module])
+	else
+		enable_libltdl_is="no"
+	fi
+fi
+AM_CONDITIONAL(ENABLE_LIBLTDL, test "${enable_libltdl_is}" = "yes")
+
 AC_SUBST(HCL_SIZEOF_WCHAR_T, $ac_cv_sizeof_wchar_t)
 AC_SUBST(HCL_SIZEOF_CHAR16_T, $ac_cv_sizeof_char16_t)
 AC_SUBST(HCL_SIZEOF_CHAR32_T, $ac_cv_sizeof_char32_t)
diff --git a/lib/Makefile.am b/lib/Makefile.am
index b638113..9af14d6 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -20,12 +20,12 @@ CPPFLAGS_LIB_COMMON = $(CPPFLAGS_ALL_COMMON)
 LDFLAGS_LIB_COMMON = $(LDFLAGS_ALL_COMMON) -version-info 1:0:0 -no-undefined
 LIBADD_LIB_COMMON = $(LIBM)
 
-#if ENABLE_LIBLTDL
-#CPPFLAGS_LIB_COMMON += $(LTDLINCL)
-#LIBADD_LIB_COMMON += $(LIBLTDL)
-#else
+if ENABLE_LIBLTDL
+LIBADD_LIB_COMMON += $(LTDL_LIBS)
+else
 LIBADD_LIB_COMMON += $(DL_LIBS)
-#endif
+endif
+
 
 pkgincludedir = $(includedir)
 pkglibdir = $(libdir)
diff --git a/lib/Makefile.in b/lib/Makefile.in
index 7950239..173e60e 100644
--- a/lib/Makefile.in
+++ b/lib/Makefile.in
@@ -88,13 +88,15 @@ PRE_UNINSTALL = :
 POST_UNINSTALL = :
 build_triplet = @build@
 host_triplet = @host@
-@ENABLE_STATIC_MODULE_TRUE@am__append_1 = -lhcl-arr -lhcl-dic \
+@ENABLE_LIBLTDL_TRUE@am__append_1 = $(LTDL_LIBS)
+@ENABLE_LIBLTDL_FALSE@am__append_2 = $(DL_LIBS)
+@ENABLE_STATIC_MODULE_TRUE@am__append_3 = -lhcl-arr -lhcl-dic \
 @ENABLE_STATIC_MODULE_TRUE@	-lhcl-str
-@ENABLE_STATIC_MODULE_TRUE@am__append_2 = $(abs_builddir)/../mod/libhcl-arr.la \
+@ENABLE_STATIC_MODULE_TRUE@am__append_4 = $(abs_builddir)/../mod/libhcl-arr.la \
 @ENABLE_STATIC_MODULE_TRUE@	$(abs_builddir)/../mod/libhcl-dic.la \
 @ENABLE_STATIC_MODULE_TRUE@	$(abs_builddir)/../mod/libhcl-str.la
 bin_PROGRAMS = hcl$(EXEEXT)
-@ENABLE_STATIC_MODULE_FALSE@hcl_DEPENDENCIES = $(am__DEPENDENCIES_2)
+@ENABLE_STATIC_MODULE_FALSE@hcl_DEPENDENCIES = $(am__DEPENDENCIES_4)
 subdir = lib
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/m4/ax_cxx_namespace.m4 \
@@ -141,7 +143,10 @@ am__installdirs = "$(DESTDIR)$(pkglibdir)" "$(DESTDIR)$(bindir)" \
 	"$(DESTDIR)$(pkgincludedir)"
 LTLIBRARIES = $(pkglib_LTLIBRARIES)
 am__DEPENDENCIES_1 =
-am__DEPENDENCIES_2 = $(am__DEPENDENCIES_1) $(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)
 am_libhcl_la_OBJECTS = libhcl_la-bigint.lo libhcl_la-comp.lo \
 	libhcl_la-debug.lo libhcl_la-decode.lo libhcl_la-dic.lo \
 	libhcl_la-err.lo libhcl_la-exec.lo libhcl_la-gc.lo \
@@ -228,7 +233,6 @@ CTAGS = ctags
 am__DIST_COMMON = $(srcdir)/Makefile.in $(srcdir)/hcl-cfg.h.in \
 	$(top_srcdir)/ac/depcomp
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
-#endif
 pkgincludedir = $(includedir)
 pkglibdir = $(libdir)
 ACLOCAL = @ACLOCAL@
@@ -294,6 +298,7 @@ LIBTOOL = @LIBTOOL@
 LIBTOOL_DEPS = @LIBTOOL_DEPS@
 LIPO = @LIPO@
 LN_S = @LN_S@
+LTDL_LIBS = @LTDL_LIBS@
 LTLIBOBJS = @LTLIBOBJS@
 LT_SYS_LIBRARY_PATH = @LT_SYS_LIBRARY_PATH@
 MAKEINFO = @MAKEINFO@
@@ -391,12 +396,7 @@ CPPFLAGS_ALL_COMMON = \
 ##################################################
 CPPFLAGS_LIB_COMMON = $(CPPFLAGS_ALL_COMMON)
 LDFLAGS_LIB_COMMON = $(LDFLAGS_ALL_COMMON) -version-info 1:0:0 -no-undefined
-
-#if ENABLE_LIBLTDL
-#CPPFLAGS_LIB_COMMON += $(LTDLINCL)
-#LIBADD_LIB_COMMON += $(LIBLTDL)
-#else
-LIBADD_LIB_COMMON = $(LIBM) $(DL_LIBS)
+LIBADD_LIB_COMMON = $(LIBM) $(am__append_1) $(am__append_2)
 pkginclude_HEADERS = \
 	hcl-cfg.h \
 	hcl-cmn.h \
@@ -432,8 +432,8 @@ libhcl_la_SOURCES = \
 
 libhcl_la_CPPFLAGS = $(CPPFLAGS_LIB_COMMON)
 libhcl_la_LDFLAGS = $(LDFLAGS_LIB_COMMON)
-libhcl_la_LIBADD = $(LIBADD_LIB_COMMON) $(am__append_1)
-libhcl_la_DEPENDENCIES = $(am__append_2)
+libhcl_la_LIBADD = $(LIBADD_LIB_COMMON) $(am__append_3)
+libhcl_la_DEPENDENCIES = $(am__append_4)
 hcl_SOURCES = main.c
 hcl_CPPFLAGS = $(CPPFLAGS_LIB_COMMON)
 hcl_LDFLAGS = $(LDFLAGS_LIB_COMMON)
diff --git a/lib/hcl-cfg.h.in b/lib/hcl-cfg.h.in
index 9390fe6..78cc570 100644
--- a/lib/hcl-cfg.h.in
+++ b/lib/hcl-cfg.h.in
@@ -87,6 +87,9 @@
 /* Define to 1 if you have the `logq' function. */
 #undef HAVE_LOGQ
 
+/* Define to 1 if you have the <ltdl.h> header file. */
+#undef HAVE_LTDL_H
+
 /* Define to 1 if you have the `makecontext' function. */
 #undef HAVE_MAKECONTEXT
 
@@ -234,6 +237,9 @@
 /* enable dynamic module capability */
 #undef HCL_ENABLE_DYNAMIC_MODULE
 
+/* use libltdl when loading a dynamic module */
+#undef HCL_ENABLE_LIBLTDL
+
 /* link modules statically into the main library */
 #undef HCL_ENABLE_STATIC_MODULE
 
diff --git a/mod/Makefile.in b/mod/Makefile.in
index 4937a76..79f3629 100644
--- a/mod/Makefile.in
+++ b/mod/Makefile.in
@@ -295,6 +295,7 @@ LIBTOOL = @LIBTOOL@
 LIBTOOL_DEPS = @LIBTOOL_DEPS@
 LIPO = @LIPO@
 LN_S = @LN_S@
+LTDL_LIBS = @LTDL_LIBS@
 LTLIBOBJS = @LTLIBOBJS@
 LT_SYS_LIBRARY_PATH = @LT_SYS_LIBRARY_PATH@
 MAKEINFO = @MAKEINFO@