diff --git a/runtime/GCCLibraries/libpthread/Makefile b/runtime/GCCLibraries/libpthread/Makefile
new file mode 100644
index 00000000000..b3de4284076
--- /dev/null
+++ b/runtime/GCCLibraries/libpthread/Makefile
@@ -0,0 +1,14 @@
+##===- runtime/GCCLibraries/libpthread/Makefile ------------*- Makefile -*-===##
+# 
+#                     The LLVM Compiler Infrastructure
+#
+# This file was developed by the LLVM research group and is distributed under
+# the University of Illinois Open Source License. See LICENSE.TXT for details.
+# 
+##===----------------------------------------------------------------------===##
+LEVEL = ../../..
+BYTECODE_LIBRARY=1
+DONT_BUILD_RELINKED=1
+LIBRARYNAME=pthread
+
+include $(LEVEL)/Makefile.common
diff --git a/runtime/GCCLibraries/libpthread/pthread.c b/runtime/GCCLibraries/libpthread/pthread.c
new file mode 100644
index 00000000000..cb5818ccc2f
--- /dev/null
+++ b/runtime/GCCLibraries/libpthread/pthread.c
@@ -0,0 +1,8 @@
+#include <pthread.h>
+
+int
+pthread_once (pthread_once_t * control, void (*func) (void))
+{
+  return 0;
+}
+