support _BSD_SOURCE feature test macro

[musl] / include / grp.h

diff --git a/include/grp.h b/include/grp.h
index 5185185..0a55c62 100644 (file)
--- a/include/grp.h
+++ b/include/grp.h
@@ -28,7 +28,7 @@ struct group  *getgrent(void);
 void           endgrent(void);
 void           setgrent(void);
 
-#ifdef _GNU_SOURCE
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 int getgrouplist(const char *, gid_t, gid_t *, int *);
 int setgroups(size_t, const gid_t *);
 int initgroups(const char *, gid_t);