$ gcc --version gcc (Debian 4.9.1-19) 4.9.1 Copyright (C) 2014 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. $ gcc oscp.c oscp.c: In function ‘show_help’: oscp.c:112:13: error: ‘BUILD’ undeclared (first use in this function) ", VERSION, BUILD, MD5, confname, progname); ^ oscp.c:112:13: note: each undeclared identifier is reported only once for each function it appears in oscp.c:112:20: error: ‘MD5’ undeclared (first use in this function) ", VERSION, BUILD, MD5, confname, progname); ^ oscp.c: In function ‘get_ch’: oscp.c:1634:14: warning: overflow in implicit constant conversion [-Woverflow] } else ch = (chtype) ERR; ^