diff --git a/ChangeLog b/ChangeLog
index ec5415179..9a42b3fd1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2008-09-13 Holger Vogt
+ * configure.in: add AC_LIBTOOL_WIN32_DLL
+ * src/makefile.am correct typo
+
 2008-09-13 Holger Vogt
  * configure.in: add /mingw as search path for tcl
  * tclspice.c: replace sigsetjump and sigjmp_buf with macros from macros.h
diff --git a/configure.in b/configure.in
index 84675a852..6b8a0490f 100644
--- a/configure.in
+++ b/configure.in
@@ -206,6 +206,8 @@ AM_MAINTAINER_MODE
 dnl Compiler checks
 dnl ---------------
 
+ext_CFLAGS="$CFLAGS"
+
 AC_PROG_CC
 
 dnl Work on compiler options according to system:
@@ -215,16 +217,16 @@ dnl the above AC_PROG_CC may set CFLAGS to "-O2 -g"
 if test "$enable_debug" = "no"; then
 	if test "x$GCC" = "xyes"; then
 		AC_MSG_WARN(Removing debugging option!)
-		CFLAGS="$CFLAGS -O2 -Wall"
+		CFLAGS="$ext_CFLAGS -O2 -Wall -s"
 	else
 		AC_MSG_WARN(Removing debugging option!)
-		CFLAGS="$CFLAGS"
+		CFLAGS="$ext_CFLAGS -O2"
 	fi
 else
 	if test "x$GCC" = "xyes"; then
-		CFLAGS="$CFLAGS -g -O0 -Wall"
+		CFLAGS="$ext_CFLAGS -g -O0 -Wall"
 	else
-		CFLAGS="$CFLAGS -g"
+		CFLAGS="$ext_CFLAGS -g"
 	fi
 fi
 
@@ -268,6 +270,7 @@ AC_CANONICAL_HOST
 
 
 dnl Checks for programs
+AC_LIBTOOL_WIN32_DLL
 AC_LIBTOOL_DLOPEN
 AM_PROG_LIBTOOL
 AC_PROG_LIBTOOL
diff --git a/src/Makefile.am b/src/Makefile.am
index b7482f340..e9d0df67b 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -267,7 +267,7 @@ libspice_la_LIBADD = ngspice.lo conf.lo \
 	misc/libmisc.la \
 	tclspice.lo $(LIBS) 
 libspice_la_CFLAGS = $(AM_CFLAGS)
-libspice_la_LDFALGS =  -shared -Wl,--version-script=tclspice.map
+libspice_la_LDFLAGS =  -shared -Wl,--version-script=tclspice.map -no-undefined
 
 CLEANFILES = pkgIndex.tcl libspice.so