Eu estou vendo um bug muito chato que eu realmente não sei como lidar. Parece ser bastante comum, e eu tentei quase todas as soluções que encontrei sem sucesso.

Estou tentando instalar bibliotecas usando pip. Esse problema foi encontrado com gevent, com psycopg2 e com greenlet. O problema parece ser que o meu computador não pode encontrar um compilador C em particular que deve vir com o XCode 4: gcc-4.2. Aqui está um exemplo (embora também tenham sido feitas tentativas em um virtualenv).

Last login: Sun Jul 29 23:35:54 on ttys000
*******s-MacBook-Pro:~ ******$ pip install gevent
Downloading/unpacking gevent
  Downloading gevent-0.13.7.tar.gz (288Kb): 288Kb downloaded
  Running setup.py egg_info for package gevent

Downloading/unpacking greenlet (from gevent)
  Downloading greenlet-0.4.0.zip (72Kb): 72Kb downloaded
  Running setup.py egg_info for package greenlet

Installing collected packages: gevent, greenlet
  Running setup.py install for gevent
    building 'gevent.core' extension
    gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -isysroot /Developer/SDKs/MacOSX10.6.sdk -arch i386 -arch x86_64 -g -O2 -DNDEBUG -g -O3 -I/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c gevent/core.c -o build/temp.macosx-10.6-intel-2.7/gevent/core.o
In file included from /Library/Frameworks/Python.framework/Versions/2.7/include/python2.7/unicodeobject.h:4,
                 from /Library/Frameworks/Python.framework/Versions/2.7/include/python2.7/Python.h:85,
                 from gevent/core.c:4:
/Developer/SDKs/MacOSX10.6.sdk/usr/include/stdarg.h:4:25: error: stdarg.h: No such file or directory
In file included from gevent/core.c:225:
gevent/libevent.h:9:19: error: event.h: No such file or directory
gevent/libevent.h:38:20: error: evhttp.h: No such file or directory
gevent/libevent.h:39:19: error: evdns.h: No such file or directory
gevent/core.c:361: error: field ‘ev’ has incomplete type
gevent/core.c:741: warning: parameter names (without types) in function declaration

....more like this but i'll skip it for now....

copying gevent/wsgi.py -> build/lib.macosx-10.6-intel-2.7/gevent

running build_ext

building 'gevent.core' extension

creating build/temp.macosx-10.6-intel-2.7

creating build/temp.macosx-10.6-intel-2.7/gevent

gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -isysroot /Developer/SDKs/MacOSX10.6.sdk -arch i386 -arch x86_64 -g -O2 -DNDEBUG -g -O3 -I/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c    gevent/core.c -o build/temp.macosx-10.6-intel-2.7/gevent/core.o

In file included from /Library/Frameworks/Python.framework/Versions/2.7/include/python2.7/unicodeobject.h:4,

             from /Library/Frameworks/Python.framework/Versions/2.7/include/python2.7/Python.h:85,

             from gevent/core.c:4:

/Developer/SDKs/MacOSX10.6.sdk/usr/include/stdarg.h:4:25: error: stdarg.h: No such file or directory

In file included from gevent/core.c:225:

gevent/libevent.h:9:19: error: event.h: No such file or directory

gevent/libevent.h:38:20: error: evhttp.h: No such file or directory

gevent/libevent.h:39:19: error: evdns.h: No such file or directory

....more like this as well....

gevent/core.c:15559: warning: assignment makes pointer from integer without a cast

gevent/core.c: At top level:

gevent/core.c:21272: error: expected ‘)’ before ‘val’

lipo: can't figure out the architecture type of:    /var/folders/xc/f2mg5kn96kqdr3tj19pgyhs00000gn/T//cckLxkJ2.out

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

Command /Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python -c        "import setuptools;__file__='/Users/******/build/gevent/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --single-version-externally-managed --record   /var/folders/xc/f2mg5kn96kqdr3tj19pgyhs00000gn/T/pip-yA5oWR-record/install-record.txt failed with error code 1 in /Users/******/build/gevent
Storing complete log in /Users/******/.pip/pip.log
***********s-MacBook-Pro:~ ******$ 

Coisas que você pode perguntar:

1) Você tentou usar um virtualenv?

Sim. E eu tentei ligar um gcc preexistente (que está presente no diretório / usr / bin /) assim:

ln -s /usr/bin/gcc gcc-4.2
ln -s /usr/bin/gcc-4.2 gcc-4.2
ln -s /usr/bin/gcc gcc

Nenhum dos quais funcionou.

2) Você tentou reinstalar o XCode?

Sim.

3) Você instalou as ferramentas de linha de comando do XCode?

Sim.

4) Você tem certeza que tem o gcc?

**********s-MacBook-Pro:~ sanjay$ gcc
i686-apple-darwin11-llvm-gcc-4.2: no input files

5) Instalação do Python?

************s-MacBook-Pro:~ ******$ python
Python 2.7.3 (v2.7.3:70274d53c1dd, Apr  9 2012, 20:52:43) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.

Alguma idéia do que pode estar errado e como corrigi-lo?

Eu também tentei instalar isso:https://github.com/kennethreitz/osx-gcc-installer . Eu não tenho ideia do que mais tentar. Eu sou um pouco novo no bloco quando se trata deste código unix-y / coisas de instalação, por isso, se há algo que eu estou fazendo muito mal, por favor, aponte.

Obrigado!