diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b0ad01519e5..0b1b47b7476 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+Fri Oct 30 10:43:29 1998  Andreas Schwab  <schwab@issan.cs.uni-dortmund.de>
+
+	* configure.in: Ignore non-absolute value in $AS.
+
 Fri Oct 30 00:54:25 1998  Peter Jakubek <pjak@snafu.de>
 
 	* m68k.h (INDIRECTABLE_1_ADDRESS_P): Fix thinko.
diff --git a/gcc/configure.in b/gcc/configure.in
index 6bb40d37335..5fd132a43ce 100644
--- a/gcc/configure.in
+++ b/gcc/configure.in
@@ -112,14 +112,17 @@ gas_flag=no)
 AC_ARG_WITH(as,
 [  --with-as               arrange to use the specified as (full pathname).],
 AS="$with_as")
-if test x"${AS+set}" = x"set"; then
+# Ignore any non-absolute value which comes from ${GCC_FLAGS_TO_PASS}.
+case $AS in
+/*)
   if test ! -x "$AS"; then
     AC_MSG_WARN([cannot execute: $AS: check --with-as or env. var. AS])
   elif test "GNU" = `$AS -v </dev/null 2>&1 | sed '1s/^GNU.*/GNU/;q'`; then
     gas_flag=yes
   fi
   AC_DEFINE_UNQUOTED(DEFAULT_ASSEMBLER,"$AS")
-fi
+  ;;
+esac
 
 # With stabs
 AC_ARG_WITH(stabs,