diff -Nadurp ngspice-23.orig//configure.ac ngspice-23/configure.ac
--- ngspice-23.orig//configure.ac	2011-05-30 12:47:05.000000000 -0600
+++ ngspice-23/configure.ac	2011-07-14 10:47:14.668378976 -0600
@@ -203,10 +203,10 @@ dnl the above AC_PROG_CC may set CFLAGS
 if test "$enable_debug" = "no"; then
 	if test "x$GCC" = "xyes"; then
 		AC_MSG_WARN(Removing debugging option!)
-		CFLAGS="$ext_CFLAGS -O2 -Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes -Wimplicit-function-declaration -Wnested-externs -Wold-style-definition -Wredundant-decls -s"
+		CFLAGS="$ext_CFLAGS -Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes -Wimplicit-function-declaration -Wnested-externs -Wold-style-definition -Wredundant-decls"
 	else
 		AC_MSG_WARN(Removing debugging option!)
-		CFLAGS="$ext_CFLAGS -O2"
+		CFLAGS="$ext_CFLAGS"
 	fi
 else
     AC_DEFINE(NGDEBUG,1,[Compile with debug info])
diff -Nadurp ngspice-23.orig//src/xspice/icm/makedefs.in ngspice-23/src/xspice/icm/makedefs.in
--- ngspice-23.orig//src/xspice/icm/makedefs.in	2011-01-25 11:34:11.000000000 -0700
+++ ngspice-23/src/xspice/icm/makedefs.in	2011-07-14 10:58:25.521002437 -0600
@@ -41,16 +41,16 @@ endif
 CMPP = $(top_builddir)/src/xspice/cmpp/cmpp
 
 # Flags to use when linking shared library
-LDFLAGS = -shared
+LDFLAGS += -shared
 ifeq ($(ISMINGW), 1)
-  LDFLAGS = -shared @LDFLAGS@
+  LDFLAGS += -shared @LDFLAGS@
 endif
 ifeq "$(strip $(uname))" "Darwin"
-  LDFLAGS = -bundle -flat_namespace -undefined suppress
+  LDFLAGS += -bundle -flat_namespace -undefined suppress
 endif
 ifeq "$(strip $(uname))" "SunOS"
   ifneq "$(CC)" "gcc"
-    LDFLAGS = -G
+    LDFLAGS += -G
   endif
 endif