--- a/fix_options.c
+++ b/fix_options.c
@@ -38,7 +38,12 @@ struct request_info *request;
 #ifdef IP_OPTIONS
     unsigned char optbuf[BUFFER_SIZE / 3], *cp;
     char    lbuf[BUFFER_SIZE], *lp;
+#ifdef __GLIBC__
+    socklen_t optsize = sizeof(optbuf);
+    int     ipproto;
+#else
     int     optsize = sizeof(optbuf), ipproto;
+#endif
     struct protoent *ip;
     int     fd = request->fd;
     unsigned int opt;
--- a/socket.c
+++ b/socket.c
@@ -95,7 +95,11 @@ struct request_info *request;
     static struct sockaddr_in client;
     static struct sockaddr_in server;
 #endif
+#ifdef __GLIBC__
+    socklen_t  len;
+#else
     int     len;
+#endif
     char    buf[BUFSIZ];
     int     fd = request->fd;
 
@@ -426,7 +430,11 @@ int     fd;
 #else
     struct sockaddr_in sin;
 #endif
+#ifdef __GLIBC__
+    socklen_t  size = sizeof(sin);
+#else
     int     size = sizeof(sin);
+#endif
 
     /*
      * Eat up the not-yet received datagram. Some systems insist on a
