--- base/mutex.h.orig	2012-05-29 15:36:59.661959825 +0900
+++ base/mutex.h	2012-05-01 12:46:18.966692632 +0900
@@ -93,11 +93,11 @@
     // PTHREAD_MUTEX_RECURSIVE_NP and PTHREAD_MUTEX_RECURSIVE seem to be
     // variants.  For example, Mac OS X 10.4 had
     // PTHREAD_MUTEX_RECURSIVE_NP but Mac OS X 10.5 does not
-#ifdef OS_MACOSX
+#if defined(OS_MACOSX) || defined(__FreeBSD__)
 #define PTHREAD_MUTEX_RECURSIVE_VALUE PTHREAD_MUTEX_RECURSIVE
 #endif
 
-#ifdef OS_LINUX
+#if defined(OS_LINUX) && !defined(__FreeBSD__)
 #define PTHREAD_MUTEX_RECURSIVE_VALUE PTHREAD_MUTEX_RECURSIVE_NP
 #endif