我正在尝试在 mac os x mojave 上安装 mysqlclient：
sudo pip3 install mysqlclient
我收到以下错误：
clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -Dversion_info=(1,3,13,'final',0) -D__version__=1.3.13 -I/usr/local/Cellar/mysql/8.0.12/include/mysql -I/usr/local/Cellar/python3/3.6.4/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c _mysql.c -o build/temp.macosx-10.13-x86_64-3.6/_mysql.o
clang -bundle -undefined dynamic_lookup build/temp.macosx-10.13-x86_64-3.6/_mysql.o -L/usr/local/Cellar/mysql/8.0.12/lib -lmysqlclient -lssl -lcrypto -o build/lib.macosx-10.13-x86_64-3.6/_mysql.cpython-36m-darwin.so
ld: library not found for -lssl
clang: error: linker command failed with exit code 1 (use -v to see invocation)
error: command 'clang' failed with exit status 1
----------------------------------------
Command "/Users//Development/apps/hid_ve/bin/python3.6 -u -c "import setuptools, tokenize;__file__='/private/tmp/pip-install-1mo7e_ok/mysqlclient/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /private/tmp/pip-record-9bwluwz6/install-record.txt --single-version-externally-managed --compile --install-headers /Users//Development/apps/hid_ve/bin/../include/site/python3.6/mysqlclient" failed with error code 1 in /private/tmp/pip-install-1mo7e_ok/mysqlclient/
升级到 mojave 后，我遇到了与您相同的错误。经过一番挖掘后，以下步骤会有所帮助：
brew info openssl
输出很有用。如果您正在使用bash or zsh，消息是：
为了让编译器找到 openssl，您可能需要设置：
export LDFLAGS="-L/usr/local/opt/openssl/lib"
export CPPFLAGS="-I/usr/local/opt/openssl/include"
执行以上命令后，一切恢复正常。????
另外，如果您正在使用fish。消息是：
为了让编译器找到 openssl，您可能需要设置：
set -gx LDFLAGS "-L/usr/local/opt/openssl/lib"
set -gx CPPFLAGS "-I/usr/local/opt/openssl/include"
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