Issue #5680 has been reported by Martin Dürst. ---------------------------------------- Bug #5680: IPPROTO_GGP undeclared when compiling ext/socket/constants.c http://redmine.ruby-lang.org/issues/5680 Author: Martin Dürst Status: Open Priority: Normal Assignee: Category: ext Target version: ruby -v: ruby 1.8.7 (2008-08-11 patchlevel 72) [i386-cygwin] On Cygwin, with an unmodified checkout of trunk, I get an error when compiling ext/socket/constants.c, as below. I'm attaching the constdefs.c file, because this seems relevant, and is autogenerated. make[2]: Entering directory `/cygdrive/c/Data/ruby-public/ext/socket' compiling constants.c In file included from constants.c:15:0: constdefs.c: In function ???init_constants???: constdefs.c:747:48: error: ???IPPROTO_GGP??? undeclared (first use in this function) constdefs.c:747:48: note: each undeclared identifier is reported only once for each function it appears in In file included from constants.c:15:0: constdefs.c: In function ???rsock_ipproto_to_int???: constdefs.c:4202:51: error: ???IPPROTO_GGP??? undeclared (first use in this function) constdefs.c: In function ???rsock_ip_level_to_int???: constdefs.c:4432:51: error: ???IPPROTO_GGP??? undeclared (first use in this function) make[2]: *** [constants.o] Error 1 make[2]: Leaving directory `/cygdrive/c/Data/ruby-public/ext/socket' make[1]: *** [ext/socket/all] Error 2 make[1]: Leaving directory `/cygdrive/c/Data/ruby-public' make: *** [build-ext] Error 2 -- http://redmine.ruby-lang.org