1 files changed, 6 insertions, 0 deletions
diff --git a/include/grp.h b/include/grp.h
index d4a3526a..51851851 100644
--- a/include/grp.h
+++ b/include/grp.h
@@ -28,6 +28,12 @@ struct group  *getgrent(void);
 void           endgrent(void);
 void           setgrent(void);
 
+#ifdef _GNU_SOURCE
+int getgrouplist(const char *, gid_t, gid_t *, int *);
+int setgroups(size_t, const gid_t *);
+int initgroups(const char *, gid_t);
+#endif
+
 #ifdef __cplusplus
 }
 #endif