implement legacy function herror

[musl] / include / sys / socket.h

diff --git a/include/sys/socket.h b/include/sys/socket.h
index 9e0b9a3..82edd6f 100644 (file)
--- a/include/sys/socket.h
+++ b/include/sys/socket.h
@@ -19,12 +19,14 @@ extern "C" {
 
 #include <bits/socket.h>
 
+#ifdef _GNU_SOURCE
 struct ucred
 {
        pid_t pid;
        uid_t uid;
        gid_t gid;
 };
+#endif
 
 struct linger
 {