diff --git a/dtool/src/parser-inc/semaphore.h b/dtool/src/parser-inc/semaphore.h
new file mode 100644
index 0000000000..3df5f02b93
--- /dev/null
+++ b/dtool/src/parser-inc/semaphore.h
@@ -0,0 +1,6 @@
+
+typedef union {
+  char __size[];
+  long int __align;
+} sem_t;
+