安装psycopg2时出错，找不到-lssl的库

我运行“sudo pip install psycopg2”，我得到了一堆类似的输出

cc -DNDEBUG -g -fwrapv -Os ..... ..... cc -DNDEBUG -g -fwrapv -Os ..... ..... 

最后它说：

 ld: library not found for -lssl clang: error: linker command failed with exit code 1 (use -v to see invocation) error: command 'cc' failed with exit status 1 ---------------------------------------- Cleaning up... Command /usr/bin/python -c "import setuptools, tokenize;__file__='/private/var/folders/bz/pvj1g9xj16d10pjjgbrfl3fw0000gn/T/pip_build_root/psycopg2/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/bz/pvj1g9xj16d10pjjgbrfl3fw0000gn/T/pip-uE3thn-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /private/var/folders/bz/pvj1g9xj16d10pjjgbrfl3fw0000gn/T/pip_build_root/psycopg2 Storing debug log for failure in /Users/Tyler/Library/Logs/pip.log 

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运行easy_install或者从源代码运行，最后都会给我提供相同的错误（关于-lssl找不到库的部分）。

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运行brew安装（或升级）openssl会产生下面的结果

 $ brew upgrade openssl Error: openssl-1.0.1h already installed 

谁能帮我吗？

Answer 1

对于任何在macOS Sierra 10.12上寻找解决scheme的人：我通过安装命令行工具来解决这个问题：

 xcode-select --install 

之后， pip install psycopg2应该可以工作。

如果没有，你也可以尝试链接brew的openssl：

 env LDFLAGS="-I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib" pip install psycopg2 

通过brew安装openssl。 请注意， brew link openssl --force不再工作：

 $ brew link openssl --force 17.5s Warning: Refusing to link: openssl Linking keg-only openssl means you may end up linking against the insecure, deprecated system OpenSSL while using the headers from Homebrew's openssl. Instead, pass the full include/library paths to your compiler eg: -I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib 

正如@macho指出的，如果这仍然不起作用，您可能需要使用pip的--no-cache选项，例如

 env LDFLAGS="-I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib" pip --no-cache install psycopg2 

Answer 2

当运行brew link openssl我得到以下消息：

 $ brew link openssl Warning: Refusing to link: openssl Linking keg-only openssl means you may end up linking against the insecure, deprecated system OpenSSL while using the headers from Homebrew's openssl. Instead, pass the full include/library paths to your compiler eg: -I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib 

遵循这个build议，你需要使用pip命令：

 $ pip install -r requirements.txt --global-option=build_ext --global-option="-I/usr/local/opt/openssl/include" --global-option="-L/usr/local/opt/openssl/lib" 

Answer 3

我已经设法解决它通过使用：

 brew unlink openssl && brew link openssl --force 

我不确定这与我之前尝试过的在OpenSSL上进行的brew卸载/升级有什么不同。 我的假设是，这些操作留下了一些“错误的”共享库，这阻止了这个工作。 请注意，这也解决了安装python密码模块的问题。