编译c语言程序扩展ruby

//C++头文件目录

CPLUS_INCLUDE_PATH=%MINGW_PATH%/include/c++/4.8.1;%MINGW_PATH%/include/c++/4.8.1/mingw32;%MINGW_PATH%/include/c++/4.8.1/backward

d:/RailsInstaller/Ruby2.2.0/include/ruby-2.2.0/ruby/win32.h:319:44: warning:'st
 extern int clock_gettime(clockid_t, struct timespec *);
                                            ^
d:/RailsInstaller/Ruby2.2.0/include/ruby-2.2.0/ruby/win32.h:320:43: warning: 'st
 externint clock_getres(clockid_t,struct timespec *);

process_begin:CreateProcess(NULL, rm -f mytest.so,...) failed.
make (e=2):Makefile:271: recipe for target 'mytest.so' fail