在mac上的django项目中安装mysqlclient时出现如下的报错：

ld: library not found for -lssl

这个问题可能是两个原因导致的：

1、没有安装openssl，可以使用如下的方式安装：

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$ brew install openssl
$ pip install mysqlclient

2、pip寻找依赖机制问题，需要指定openssl库：

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$ LDFLAGS=-L/usr/local/opt/openssl/lib pip install mysqlclient

还有一种可能是报这种错误：

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In file included from MySQLdb/_mysql.c:29:
    In file included from /usr/local/opt/mysql-client/include/mysql/mysql.h:45:
    In file included from /Library/Developer/CommandLineTools/usr/lib/clang/12.0.0/include/stdint.h:52:
    In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/stdint.h:53:
    In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_types/_intptr_t.h:30:
    /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/machine/types.h:37:2: error: architecture not supported
    #error architecture not supported

原因是xcode 12编译了 ARM64 版本的二进制文档导致了异常的抛出，使用下面方式解决：

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$ ARCHFLAGS="-arch x86_64"   pip install mysqlclient