问题
I'm on Mac OSX 10.8 (Mountain Lion) and have just installed Python 3.2.3.
When installing pycrypto from a virtual environment using that version of python:
$ virtualenv --no-site-packages -p /usr/local/bin/python3.2-32 venv
$ source venv/bin/activate
$ pip install pycrypto
I get the error:
gcc-4.2 not found, using clang instead
building 'Crypto.Hash._MD2' extension
warning: GMP or MPIR library not found; Not building Crypto.PublicKey._fastmath.
Compiling with an SDK that doesn't seem to exist: /Developer/SDKs/MacOSX10.6.sdk
Please check your Xcode installation
clang -fno-strict-aliasing -fno-common -dynamic -isysroot /Developer/SDKs/MacOSX10.6.sdk -arch i386 -arch x86_64 -isysroot /Developer/SDKs/MacOSX10.6.sdk -std=c99 -O3 -fomit-frame-pointer -Isrc/ -I/Library/Frameworks/Python.framework/Versions/3.2/include/python3.2m -c src/MD2.c -o build/temp.macosx-10.6-intel-3.2/src/MD2.o
src/MD2.c:30:10: fatal error: 'string.h' file not found
#include <string.h>
^
1 error generated.
error: command 'clang' failed with exit status 1
Similar thing happens when attempting to install cryptacular.
As of version 2.4, Pycrypto says it supports python 3.
I'ved added a symlink to the xcode developer folder:
$ sudo ln -s /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer /Developer
but all that exists in that folder are MacOSX10.7.sdk MacOSX10.8.sdk (not MacOSX10.6.sdk as needed above).
Am I missing anything in my system? How can I tell it to use one of the other SDKs?
回答1:
Got it to work by doing the following:
As in the comment above, made sure the Command Line Tools are installed, which also installs the system headers:
Start Xcode, open Xcode -> Preferences... and go to the Downloads tab. Under Components make sure the Command Line Tools are installed; this will also install system headers in system folders.
As instructed in this answer, create a symbolic link to the developer folder:
sudo ln -s /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer /Developer
However, still go the error message:
Compiling with an SDK that doesn't seem to exist: /Developer/SDKs/MacOSX10.6.sdk
This relates to an issue that Python 3.2 assumes you are using Mac OSX 10.6
I fixed, this by faking the OSX 10.6 environment by creating a symbolic link from it to the OSX 10.8 environment:
sudo ln -s /Developer/SDKs/MacOSX10.8.sdk MacOSX10.6.sdk
Package successfully installs now.
来源：https://stackoverflow.com/questions/13588518/fatal-error-string-h-file-not-found-after-upgrading-to-python-3-2-and-install