有人在win7下折腾jekyll吗？

ruby 2.0.0p195 (2013-05-14) [x64-mingw32] 环境以及搭建好了
运行gem install jekyll 报错，无法继续往下
porter_wrap.c:27:16: warning: cast to pointer from integer of different size
porter_wrap.c:27:16: warning: cast to pointer from integer of different size
porter_wrap.c:27:16: warning: cast to pointer from integer of different size
porter_wrap.c:27:34: warning: cast to pointer from integer of different size
porter_wrap.c:27:34: warning: cast to pointer from integer of different size
porter_wrap.c:27:34: warning: cast to pointer from integer of different size
porter_wrap.c:28:7: warning: cast to pointer from integer of different size
porter_wrap.c:28:7: warning: cast to pointer from integer of different size
porter_wrap.c:28:7: warning: cast to pointer from integer of different size
porter_wrap.c:20:17: warning: unused variable 'i'
make: *** [porter_wrap.o] Error 1

Gem files will remain installed in C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/fast-
stemmer-1.0.2 for inspection.
Results logged to C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/fast-stemmer-1.0.2/ext
/gem_make.out

检测了mkmf.log

"x86_64-w64-mingw32-gcc -o conftest.exe -IC:/Ruby200-x64/include/ruby-2.0.0/x64-mingw32 -IC:/Ruby200-x64/include/ruby-2.0.0/ruby/backward -IC:/Ruby200-x64/include/ruby-2.0.0 -I. -DFD_SETSIZE=2048 -D_WIN32_WINNT=0x0501 -D_FILE_OFFSET_BITS=64 -O3 -fno-omit-frame-pointer -fno-fast-math -g -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -march=native conftest.c -L. -LC:/Ruby200-x64/lib -L. -lx64-msvcrt-ruby200 -lshell32 -lws2_32 -limagehlp -lshlwapi "
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: #include <winsock2.h>
4: #include <windows.h>
5: int main(int argc, char **argv)
6: {
7: return 0;
8: }
/* end */
求大神解决，百度google都无解，因为不太懂ruby。不知如何是好！！！