我一直在尝试通过以下方式在 OSX 10.8 上安装 ffi
gem install ffi -v '1.1.5'
结果
ERROR: Error installing ffi:
ERROR: Failed to build gem native extension.
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb
checking for ffi.h... no
checking for ffi.h in /usr/local/include,/usr/include/ffi... no
checking for rb_thread_blocking_region()... no
checking for ruby_native_thread_p()... no
checking for rb_thread_call_with_gvl()... no
creating extconf.h
creating Makefile
make
mkdir -p "/Library/Ruby/Gems/1.8/gems/ffi-1.1.5/ext/ffi_c"/libffi-i386; (if [ ! -f "/Library/Ruby/Gems/1.8/gems/ffi-1.1.5/ext/ffi_c"/libffi-i386/Makefile ]; then echo "Configuring libffi for i386"; cd "/Library/Ruby/Gems/1.8/gems/ffi-1.1.5/ext/ffi_c"/libffi-i386 && env CC=" xcrun cc" CFLAGS="-arch i386 " LDFLAGS="-arch i386" "/Library/Ruby/Gems/1.8/gems/ffi-1.1.5/ext/ffi_c/libffi"/configure --disable-static --with-pic=yes --disable-dependency-tracking --host=i386-apple-darwin > /dev/null; fi); env MACOSX_DEPLOYMENT_TARGET=10.4 make -C "/Library/Ruby/Gems/1.8/gems/ffi-1.1.5/ext/ffi_c"/libffi-i386
Configuring libffi for i386
configure: WARNING: if you wanted to set the --build type, don't use --host.
If a cross compiler is detected then cross compile mode will be used
configure: error: in `/Library/Ruby/Gems/1.8/gems/ffi-1.1.5/ext/ffi_c/libffi-i386':
configure: error: C compiler cannot create executables
See `config.log' for more details
make[1]: *** No targets specified and no makefile found. Stop.
make: *** ["/Library/Ruby/Gems/1.8/gems/ffi-1.1.5/ext/ffi_c"/libffi- i386/.libs/libffi_convenience.a] Error 2
Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/ffi-1.1.5 for inspection.
Results logged to /Library/Ruby/Gems/1.8/gems/ffi-1.1.5/ext/ffi_c/gem_make.out
我曾尝试遵循
安装ffi(1.1.2)时出错，Bundler无法继续 https://stackoverflow.com/questions/11725577/an-error-occured-while-installing-ffi-1-1-2-and-bundler-cannot-continue
and
山狮升级后无法安装某些宝石 https://stackoverflow.com/questions/11682429/not-able-to-install-some-gems-after-mountain-lion-upgrade
没有任何运气。
我的 ffi 安装失败，并出现非常相似的错误消息：
mkdir -p "/Library/Ruby/Gems/1.8/gems/ffi-1.9.0/ext/ffi_c"/libffi-i386; (if [ ! -f "/Library/Ruby/Gems/1.8/gems/ffi-1.9.0/ext/ffi_c"/libffi-i386/Makefile ]; then echo "Configuring libffi for i386"; cd "/Library/Ruby/Gems/1.8/gems/ffi-1.9.0/ext/ffi_c"/libffi-i386 && env CC=" xcrun cc" CFLAGS="-arch i386 " LDFLAGS="-arch i386" "/Library/Ruby/Gems/1.8/gems/ffi-1.9.0/ext/ffi_c/libffi"/configure --disable-static --with-pic=yes --disable-dependency-tracking --host=i386-apple-darwin > /dev/null; fi); env MACOSX_DEPLOYMENT_TARGET=10.4 make -C "/Library/Ruby/Gems/1.8/gems/ffi-1.9.0/ext/ffi_c"/libffi-i386
Configuring libffi for i386
configure: WARNING: if you wanted to set the --build type, don't use --host.
If a cross compiler is detected then cross compile mode will be used
configure: error: in `/Library/Ruby/Gems/1.8/gems/ffi-1.9.0/ext/ffi_c/libffi-i386':
configure: error: C compiler cannot create executables
我在命令中发现了 xcrun cc ，并尝试手动运行它，苹果给了我一条消息，说我没有同意 XCode 命令行工具的许可协议。 sudo xcrun cc后安装成功。
$ xcrun cc
Agreeing to the Xcode/iOS license requires admin privileges, please re-run as root via sudo.
$ sudo xcrun cc
You have not agreed to the Xcode license agreements. You must agree to both license agreements below in order to use Xcode.
Hit the Enter key to view the license agreements at '/Applications/Xcode.app/Contents/Resources/English.lproj/License.rtf'
...
```
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