From 742c6f32e038c90967e15f4740fcdacda1ad0f1f Mon Sep 17 00:00:00 2001
From: Matthias Benkard <code@mail.matthias.benkard.de>
Date: Thu, 7 Feb 2008 23:11:34 +0100
Subject: Objective-C layer: Implement locking using semaphores.

darcs-hash:3a1f9d1f6597b32c20efcd7ab2cf2721c1bdfe43
---
 configure.ac | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 9ea32af..1a2b245 100644
--- a/configure.ac
+++ b/configure.ac
@@ -31,6 +31,8 @@ if test x$HAVE_LIBFFI = x1; then
   AC_CHECK_HEADERS([ffi.h ffi/ffi.h], [HAVE_ANY_FFI_H=1; break])
 fi
 
+AC_CHECK_HEADERS([sys/sem.h])
+
 AC_SUBST(HAVE_ANY_FFI_H)
 AC_SUBST(HAVE_LIBFFI)
 AC_CONFIG_HEADERS([config.h])
-- 
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