安装了DevKit并重新运行ffi install ....作为输出:
C:\Documents and Settings\******>gem install ffi
Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a while...
ERROR: Error installing ffi:
ERROR: Failed to build gem native extension.
C:/Ruby192/bin/ruby.exe extconf.rb
checking for ffi.h... no
checking for ffi.h in /usr/local/include... no
checking for rb_thread_blocking_region()... yes
checking for ruby_thread_has_gvl_p()... yes
checking for ruby_native_thread_p()... yes
checking for rb_thread_call_with_gvl()... yes
creating extconf.h
creating Makefile
make
C:/Ruby192/bin/ruby -e "puts 'EXPORTS', 'Init_ffi_c'" > ffi_c-i386-mingw32.def
gcc -I. -IC:/Ruby192/include/ruby-1.9.1/i386-mingw32 -I/C/Ruby192/include/ruby-1
.9.1/ruby/backward -I/C/Ruby192/include/ruby-1.9.1 -I. …