Call AC_LANG_C, if it's defined, after AC_PREPARE.

diff --git a/configure1.in b/configure1.in
index 5902aaf3ff2e3d9ff4f25a3b60a6482d1bdc00c5..2662ba1a6dbbb498342b26bb4ee0d38438dc50bf 100755 (executable)
--- a/configure1.in
+++ b/configure1.in
@@ -1071,6 +1071,7 @@ opsysfile="s/${opsys}.h"
 
 ]
 AC_PREPARE(lisp)
+ifdef([AC_LANG_C], AC_LANG_C)dnl
 AC_CONFIG_HEADER(src/config.h)
 [