我使用rubyinstaller安装了Ruby 1.9.3。
我执行：gem install scrapi
我得到以下内容：
Gem files will remain installed in C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.0.1
1 for inspection.
Results logged to C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.0.11/ext/ffi_c/gem_m
ake.out
gem_make.out文件包含以下荒谬信息：
C:/Ruby193/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_native_thread_p()... yes
checking for rb_thread_call_with_gvl()... yes
creating extconf.h
creating Makefile
make
libffi.gnu.mk:24: *** target pattern contains no `%'. Stop.
有什么想法吗？