diff --git a/configure.in b/configure.in
index 771cd09..6e27d4e 100644
--- a/configure.in
+++ b/configure.in
@@ -70,6 +70,11 @@ AC_FUNC_STAT
 AC_FUNC_VPRINTF
 AC_CHECK_FUNCS([bzero floor getcwd gethostbyname getmntent getpagesize gettimeofday memmove memset mkdir munmap pow putenv select socket sqrt strcasecmp strchr strdup strerror strrchr strstr])
 
+AS="$CC"
+ASFLAGS="\$(DEFS) \$(CFLAGS) \$(CPPFLAGS) \$(DEFAULT_INCLUDES) \$(INCLUDES)"
+AC_SUBST(AS)
+AC_SUBST(ASFLAGS)
+
 AC_CONFIG_FILES([Makefile
 				 src/Makefile
 				 src/baseq2/Makefile