如何修复 C error: undefined reference to MD5_Update

链接 OpenSSL 时，你可能会看到：

md5_link_error.txt

undefined reference to `MD5_Update'

undefined reference to `MD5_Update'

确保你链接正确的 OpenSSL 库，例如：

gcc_openssl_example.sh

gcc -o myprog myprog.c -lcrypto

gcc -o myprog myprog.c -lcrypto

或使用 pkg-config：

pkgconfig_openssl.sh

gcc -o myprog myprog.c $(pkg-config --cflags --libs openssl)

gcc -o myprog myprog.c $(pkg-config --cflags --libs openssl)

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