C extensions are enabled

backtrace:

gem install glib2 (1.1.9)

rbglib_messages.c: In function ‘rbglib_log_handler’:
rbglib_messages.c:66:37: error: ‘ruby_sourcefile’ undeclared (first use in this function)
rbglib_messages.c:66:37: note: each undeclared identifier is reported only once for each function it appears in
rbglib_messages.c:66:54: error: ‘ruby_sourceline’ undeclared (first use in this function)
make: *** [rbglib_messages.o] Error 1