configure.ac: Don't try to dump Lisps which we couldn't find.

diff --git a/configure.ac b/configure.ac
index ac42a38..19f91ae 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -61,8 +61,9 @@ AC_ARG_ENABLE([imagedump],
 AC_DEFUN([mdw_CHECK_LISP],
 [AC_CHECK_PROGS([$1], [$2])
 AC_ARG_VAR([$1], [Path to the $1 Lisp system.])
-case ,$enable_imagedump, in
-  ,yes, | *,$2,*) dump=t ;;
+case $[]$1:,$enable_imagedump, in
+  :*) dump=nil ;;
+  *:,yes, | *:*,$2,*) dump=t ;;
   *) dump=nil ;;
 esac
 AM_CONDITIONAL([DUMP_$1], [test $dump = t])])