Macos安装报错 ld: library not found for -lssl

首先，我通过:

pip install mysqlclient==1.3.13

然后报错

/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/dist.py:261: UserWarning: Unknown distribution option: 'long_description_content_type'
  warnings.warn(msg)
running install
running bdist_egg
running egg_info
creating mysqlclient.egg-info
writing mysqlclient.egg-info/PKG-INFO
writing dependency_links to mysqlclient.egg-info/dependency_links.txt
writing top-level names to mysqlclient.egg-info/top_level.txt
writing manifest file 'mysqlclient.egg-info/SOURCES.txt'
reading manifest file 'mysqlclient.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'mysqlclient.egg-info/SOURCES.txt'
installing library code to build/bdist.macosx-10.9-x86_64/egg
running install_lib
running build_py
creating build
creating build/lib.macosx-10.9-x86_64-3.6
copying _mysql_exceptions.py -> build/lib.macosx-10.9-x86_64-3.6
creating build/lib.macosx-10.9-x86_64-3.6/MySQLdb
copying MySQLdb/__init__.py -> build/lib.macosx-10.9-x86_64-3.6/MySQLdb
copying MySQLdb/compat.py -> build/lib.macosx-10.9-x86_64-3.6/MySQLdb
copying MySQLdb/connections.py -> build/lib.macosx-10.9-x86_64-3.6/MySQLdb
copying MySQLdb/converters.py -> build/lib.macosx-10.9-x86_64-3.6/MySQLdb
copying MySQLdb/cursors.py -> build/lib.macosx-10.9-x86_64-3.6/MySQLdb
copying MySQLdb/release.py -> build/lib.macosx-10.9-x86_64-3.6/MySQLdb
copying MySQLdb/times.py -> build/lib.macosx-10.9-x86_64-3.6/MySQLdb
creating build/lib.macosx-10.9-x86_64-3.6/MySQLdb/constants
copying MySQLdb/constants/__init__.py -> build/lib.macosx-10.9-x86_64-3.6/MySQLdb/constants
copying MySQLdb/constants/CLIENT.py -> build/lib.macosx-10.9-x86_64-3.6/MySQLdb/constants
copying MySQLdb/constants/CR.py -> build/lib.macosx-10.9-x86_64-3.6/MySQLdb/constants
copying MySQLdb/constants/ER.py -> build/lib.macosx-10.9-x86_64-3.6/MySQLdb/constants
copying MySQLdb/constants/FIELD_TYPE.py -> build/lib.macosx-10.9-x86_64-3.6/MySQLdb/constants
copying MySQLdb/constants/FLAG.py -> build/lib.macosx-10.9-x86_64-3.6/MySQLdb/constants
copying MySQLdb/constants/REFRESH.py -> build/lib.macosx-10.9-x86_64-3.6/MySQLdb/constants
running build_ext
building '_mysql' extension
creating build/temp.macosx-10.9-x86_64-3.6
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -I/usr/local/opt/zlib/include -Dversion_info=(1,3,13,'final',0) -D__version__=1.3.13 -I/usr/local/Cellar/mysql-connector-c/6.1.11/include -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c _mysql.c -o build/temp.macosx-10.9-x86_64-3.6/_mysql.o
gcc -bundle -undefined dynamic_lookup -arch x86_64 -g -L/usr/local/opt/zlib/lib -I/usr/local/opt/zlib/include build/temp.macosx-10.9-x86_64-3.6/_mysql.o -L/usr/local/Cellar/mysql-connector-c/6.1.11/lib -lmysqlclient -lssl -lcrypto -o build/lib.macosx-10.9-x86_64-3.6/_mysql.cpython-36m-darwin.so
ld: library not found for -lssl

其中，主要报错:

ld: library not found for -lssl

原因分析:

安装过程中，无法找到openssl文件

由于苹果公司已经放弃openssl加密转而使用自家的加密方式，导致mac上面是没有oepnssl的，所以需要

# 安装openssl
brew install openssl
# 如果已经安装
brew upgrade openssl
# 如果还不行
xcode-select --install

如果还不行（例如我），那么直接在pip的时候链接brew的openssl，记得用上不使用缓存模式

env LDFLAGS="-I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib" pip --no-cache install mysqlclient==1.3.13

ok!

结果如下:

 env LDFLAGS="-I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib" pip --no-cache install mysqlclient==1.3.13
Collecting mysqlclient==1.3.13
  Downloading https://files.pythonhosted.org/packages/ec/fd/83329b9d3e14f7344d1cb31f128e6dbba70c5975c9e57896815dbb1988ad/mysqlclient-1.3.13.tar.gz (90kB)
    100% |████████████████████████████████| 92kB 105kB/s 
Installing collected packages: mysqlclient
  Running setup.py install for mysqlclient ... done
Successfully installed mysqlclient-1.3.13