extern "C" {
#endif
+#include <features.h>
+
#define __NEED_size_t
#define __NEED_gid_t
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);