lock: work around pthread recursive mutexes bug in Mac OS X 10.6

[gnulib.git] / m4 / lock.m4

diff --git a/m4/lock.m4 b/m4/lock.m4
index d3fc1ef..aae1701 100644 (file)
--- a/m4/lock.m4
+++ b/m4/lock.m4
@@ -24,6 +24,9 @@ AC_DEFUN([gl_LOCK],
         [[
 #if __FreeBSD__ == 4
 error "No, in FreeBSD 4.0 recursive mutexes actually don't work."
+#elif (defined __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ \
+       && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1070)
+error "No, in Mac OS X < 10.7 recursive mutexes actually don't work."
 #else
 int x = (int)PTHREAD_MUTEX_RECURSIVE;
 return !x;