/usr/local/bin/ruby extconf.rb 
checking for main() in -lc... yes
creating Makefile

make "DESTDIR=" clean

make "DESTDIR="
compiling parser.c
compiling thin.c
thin.c: In function ‘Thin_HttpParser_alloc’:
thin.c:242: 警告: implicit declaration of function ‘thin_http_parser_init’
thin.c: In function ‘Thin_HttpParser_finish’:
thin.c:294: 警告: implicit declaration of function ‘thin_http_parser_finish’
thin.c:296: 警告: implicit declaration of function ‘thin_http_parser_is_finished’
thin.c: In function ‘Thin_HttpParser_execute’:
thin.c:334: 警告: implicit declaration of function ‘thin_http_parser_execute’
thin.c:338: 警告: implicit declaration of function ‘thin_http_parser_has_error’
linking shared-object thin_parser.so

make "DESTDIR=" install
/usr/bin/install -c -m 0755 thin_parser.so ./.gem.20141021-32143-io0zof
installing default thin_parser libraries