When installing openssl, an error occurs: openssl: symbol lookup error: openssl: undefined symbol: EVP_mdc2, version OPENSSL_1_

After installing openssl from the source code, when executing the openssl version command to view the version information, the following error is reported:

root@BZD25521:/etc/ld.so.conf.d# openssl version
openssl: symbol lookup error: openssl: undefined symbol: EVP_mdc2, version OPENSSL_1_1_0

Reason for error

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Missing dynamic library

Solution

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Option One:

Use the -fPIC parameter to link the dynamic library when specifying the installation path

# 将 /usr/local/openssl 替换为你自己的 openssl 安装路径
./config --prefix=/usr/local/openssl -fPIC

Option II:

1) Manually link dynamic libraries

cd /etc/ld.so.conf.d/
vim openssl-1.1.1w.conf

# 文件中添加库路径，将 /usr/local/openssl/lib 替换为你自己的 openssl 安装路径
/usr/local/openssl/lib

# 保存退出

2) Reload dynamic links

ldconfig -v

Check version information again

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root@BZD25521:/etc/ld.so.conf.d# openssl version
OpenSSL 1.1.1w  11 Sep 2023

For openssl installation tutorial, see:Ubuntu (WSL) uninstalling and installing the specified version of openssl-CSDN blog