# Pastebin 7xOr4I1Q
readline.c: In function ‘Init_readline’:
readline.c:1977:26: error: ‘Function’ undeclared (first use in this function)
     rl_pre_input_hook = (Function *)readline_pre_input_hook;
                          ^
readline.c:1977:26: note: each undeclared identifier is reported only once for each function it appears in
readline.c:1977:36: error: expected expression before ‘)’ token
     rl_pre_input_hook = (Function *)readline_pre_input_hook;
                                    ^
readline.c: At top level:
readline.c:634:1: warning: ‘readline_pre_input_hook’ defined but not used [-Wunused-function]
 readline_pre_input_hook(void)
 ^
make[2]: *** [readline.o] Error 1
make[1]: *** [ext/readline/all] Error 2
make: *** [build-ext] Error 2
!!! Compiling ruby 2.1.1 failed!