--- ntp-4.2.4p7-orig/configure.ac 2009-06-18 14:48:12.151346763 +0200 +++ ntp-4.2.4p7/configure.ac 2009-06-18 14:50:07.054692531 +0200 @@ -4456,6 +4456,7 @@ [ AC_LANG_PROGRAM( [ + #define _GNU_SOURCE #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h>