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-rw-r--r--sysdeps/mach/configure4
1 files changed, 2 insertions, 2 deletions
diff --git a/sysdeps/mach/configure b/sysdeps/mach/configure
index fb1d8b0979..dafdac5abb 100644
--- a/sysdeps/mach/configure
+++ b/sysdeps/mach/configure
@@ -5,8 +5,8 @@
 ac_help="$ac_help
   --with-mach=DIRECTORY   find Mach kernel source code in DIRECTORY [../mach]"
 # Check whether --with-mach or --without-mach was given.
-withval="$with_mach"
-if test -n "$withval"; then
+if test "${with_mach+set}" = set; then
+  withval="$with_mach"
   case z"$with_mach" in
 z | zno | zyes) ;; # Not specified, or specified with no value.
 z*) config_vars="$config_vars