pip在Mac OS X小牛上引发stdio.h未找到错误（10.9）

Question

在这一点上，我已经尝试了无数的解决方案，但似乎没有任何效果。我正在尝试安装mysql python，但是numpy和其他需要gcc的包也会出现这种情况：

building '_mysql' extension

gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -isysroot /Developer/SDKs/MacOSX10.6.sdk -g -O2 -DNDEBUG -g -O3 -Dversion_info=(1,2,5,'final',1) -D__version__=1.2.5 -I/usr/local/mysql/include -I/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c _mysql.c -o build/temp.macosx-10.6-intel-2.7/_mysql.o -Os -g -fno-strict-aliasing -arch x86_64

In file included from _mysql.c:29:

/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7/Python.h:33:10: fatal error: 'stdio.h' file not found

#include <stdio.h>

         ^

1 error generated.

error: command 'gcc-4.2' failed with exit status 1

指向：

我已经安装了命令行工具

添加了从/usr/bin/gcc到/usr/bin/gcc-4.2的符号链接

gcc-4.2 --version
Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
Target: x86_64-apple-darwin13.1.0
Thread model: posix

创建了一个虚拟的c文件，成功地编译并运行了它，所以gcc本身是很好的

$ cat a.c
#include <stdio.h>

main()
{
    printf("hello\n");
}

$ gcc-4.2 a.c
a.c:3:1: warning: type specifier missing, defaults to 'int' [-Wimplicit-int]
main()
^~~~
1 warning generated.

$ ./a.out
hello

从好的角度来看

$ xcode-select -p
/Library/Developer/CommandLineTools

怎么回事？！

编辑-忘记包含python版本

$ python
Python 2.7.2 (v2.7.2:8527427914a2, Jun 11 2011, 15:22:34)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin

编辑-令人兴奋的发展。设置这些变量会取得一些进展：

$ export CFLAGS="-arch i386 -arch x86_64"
$ export FFLAGS="-m32 -m64"
$ export LDFLAGS="-Wall -undefined dynamic_lookup -bundle -arch i386 -arch x86_64"
$ export CC=gcc-4.2
$ export CXX="g++ -arch i386 -arch x86_64"

但是它又失败了

gcc-4.2 -bundle -undefined dynamic_lookup -isysroot /Developer/SDKs/MacOSX10.6.sdk -isysroot /Developer/SDKs/MacOSX10.6.sdk -g -Wall -undefined dynamic_lookup -bundle build/temp.macosx-10.6-intel-2.7/_mysql.o -L/usr/local/mysql/lib -lmysqlclient_r -o build/lib.macosx-10.6-intel-2.7/_mysql.so -arch x86_64

ld: library not found for -lSystem

clang: error: linker command failed with exit code 1 (use -v to see invocation)

error: command 'gcc-4.2' failed with exit status 1

我怀疑这和命令工具有类似的错误。另外，为什么要使用“/Developer/SDKs/MacOSX10.6.sdk”？（请原谅noob问题，我正试图从vim/unix迁移到pycharm/mac，但到目前为止进展并不顺利：（）

Answer 1

这对我有效

xcode-select --install

Answer 2

从Mojave开始xcode-select --install是不够的，您还应该安装可以在/Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg找到的包。来源：https://forums.developer.apple.com/thread/104296

Answer 3

正如@wegry上面提到的——

brew install python

确认

$ which python
/usr/local/homebrew/bin/python

只是让它完全消失了。用pip成功安装了numpy和mysql python！