Updated pthread m4.

diff --git a/m4/ax_pthread.m4 b/m4/ax_pthread.m4
index 007f6276a42ba81c531a0d581eb768d2d0843f37..180557910c4181685ceb555ca3ef84640f394a7a 100644 (file)
--- a/m4/ax_pthread.m4
+++ b/m4/ax_pthread.m4
@@ -82,11 +82,12 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 22
+#serial 23
 
 AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
 AC_DEFUN([AX_PTHREAD], [
 AC_REQUIRE([AC_CANONICAL_HOST])
+AC_LANG_PUSH([C])
 ax_pthread_ok=no
 
 # We used to check for pthread.h first, but this fails if pthread.h
@@ -327,4 +328,5 @@ else
         ax_pthread_ok=no
         $2
 fi
+AC_LANG_POP
 ])dnl AX_PTHREAD