diff --git a/ChangeLog b/ChangeLog
index abf8612847..1f347c30e2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Thu May  2 00:30:00 2013  Tanaka Akira  <akr@fsij.org>
+
+	* thread_pthread.c (ruby_init_stack): Add STACK_GROW_DIR_DETECTION.
+	  This fixes a compilation failure while cross-compiling for Tensilica
+	  Xtensa Processor.
+
 Thu May  2 00:19:46 2013  Tanaka Akira  <akr@fsij.org>
 
 	* dir.c (dir_set_pos): Fix a compilation error when seekdir() is not
diff --git a/thread_pthread.c b/thread_pthread.c
index 46a8652192..e08f3decb8 100644
--- a/thread_pthread.c
+++ b/thread_pthread.c
@@ -669,6 +669,7 @@ ruby_init_stack(volatile VALUE *addr
 #elif defined(HAVE_GETRLIMIT)
 	int pagesize = getpagesize();
 	struct rlimit rlim;
+        STACK_GROW_DIR_DETECTION;
 	if (getrlimit(RLIMIT_STACK, &rlim) == 0) {
 	    size = (size_t)rlim.rlim_cur;
 	}
diff --git a/version.h b/version.h
index ab3142f0ce..6b3657109f 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.0.0"
 #define RUBY_RELEASE_DATE "2013-05-02"
-#define RUBY_PATCHLEVEL 179
+#define RUBY_PATCHLEVEL 180
 
 #define RUBY_RELEASE_YEAR 2013
 #define RUBY_RELEASE_MONTH 5