diff --git a/libs/apr/.update b/libs/apr/.update
index 7558e70981..7c125ac53c 100644
--- a/libs/apr/.update
+++ b/libs/apr/.update
@@ -1 +1 @@
-Thu Mar 19 21:08:11 CDT 2009
+Tue May 19 13:49:44 EDT 2009
diff --git a/libs/apr/build/apr_threads.m4 b/libs/apr/build/apr_threads.m4
index 0c9fa33fb8..e111ff0212 100644
--- a/libs/apr/build/apr_threads.m4
+++ b/libs/apr/build/apr_threads.m4
@@ -224,7 +224,7 @@ AC_DEFUN(APR_CHECK_SIGWAIT_ONE_ARG,[
 dnl Check for recursive mutex support (per SUSv3).
 AC_DEFUN([APR_CHECK_PTHREAD_RECURSIVE_MUTEX], [
   AC_CACHE_CHECK([for recursive mutex support], [apr_cv_mutex_recursive],
-[AC_TRY_RUN([#define _XOPEN_SOURCE=600
+[AC_TRY_RUN([#define _XOPEN_SOURCE 600
 #include <sys/types.h>
 #include <pthread.h>
 #include <stdlib.h>
diff --git a/libs/apr/include/arch/unix/apr_arch_proc_mutex.h b/libs/apr/include/arch/unix/apr_arch_proc_mutex.h
index de7ea511da..b836829ecc 100644
--- a/libs/apr/include/arch/unix/apr_arch_proc_mutex.h
+++ b/libs/apr/include/arch/unix/apr_arch_proc_mutex.h
@@ -18,7 +18,7 @@
 #define PROC_MUTEX_H
 
 #ifndef _XOPEN_SOURCE
-#define _XOPEN_SOURCE=600
+#define _XOPEN_SOURCE 600
 #endif
 
 #include "apr.h"
diff --git a/libs/apr/include/arch/unix/apr_arch_thread_mutex.h b/libs/apr/include/arch/unix/apr_arch_thread_mutex.h
index 0db62715bb..08ea248ea8 100644
--- a/libs/apr/include/arch/unix/apr_arch_thread_mutex.h
+++ b/libs/apr/include/arch/unix/apr_arch_thread_mutex.h
@@ -18,7 +18,7 @@
 #define THREAD_MUTEX_H
 
 #ifndef _XOPEN_SOURCE
-#define _XOPEN_SOURCE=600
+#define _XOPEN_SOURCE 600
 #endif
 
 #include "apr.h"