Index: configure.in
===================================================================
--- configure.in	(revision 33351)
+++ configure.in	(working copy)
@@ -1793,7 +1793,7 @@
 	AC_DEFINE(_REENTRANT)
 	AC_DEFINE(_THREAD_SAFE)
 	AC_DEFINE(HAVE_LIBPTHREAD)
-	AC_CHECK_HEADERS(pthread_np.h)
+	AC_CHECK_HEADERS(pthread_np.h, [], [], [#include <pthread.h>])
 	AS_CASE([$pthread_lib],
 	[c],    [],
 	[root], [],