Fix to acinclude.m4 -- please check.

[Rob Browning]

Here's the fix I added to acinclude.m4.  I wasn't absolutely sure
about it, but it seemed correct.  The problem is that AC_LANG is not a
variable.  I don't know whether it was just coincidence before, or if
they changed the behavior, but checking for CXX seemed like it might
be a suitable alternative, and I didn't find anything better in the
info docs or by looking at configure.

diff -u -r1.12 acinclude.m4
--- acinclude.m4        2001/05/15 00:54:08     1.12
+++ acinclude.m4        2001/06/02 04:59:34
@@ -76,7 +76,7 @@
     which can conflict with char $1(); below.  */
 #include <assert.h>
 /* Override any gcc2 internal prototype to avoid an error.  */
-]ifelse(AC_LANG, CPLUSPLUS, [#ifdef __cplusplus
+]ifdef(CXX, [#ifdef __cplusplus
 extern "C"
 #endif
 ])dnl


-- 
Rob Browning <address@hidden> PGP=E80E0D04F521A094 532B97F5D64E3930