support _BSD_SOURCE feature test macro

[musl] / include / sys / mman.h

diff --git a/include/sys/mman.h b/include/sys/mman.h
index a48c2b4..a45f11d 100644 (file)
--- a/include/sys/mman.h
+++ b/include/sys/mman.h
@@ -27,6 +27,9 @@ int munlockall (void);
 
 #ifdef _GNU_SOURCE
 void *mremap (void *, size_t, size_t, int, ...);
+#endif
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 int madvise (void *, size_t, int);
 #endif