但是查看已经安装了相关openssl软件，最后源码配置编译解决了问题：
当然执行如下命令能解决问题最好

yum -y install openssl openssl-devel pcre pcre-devel zlib zlib-devel

执行以上操作依然报错，我才用了源码安装

步骤如下：
我的系统是centos7.2,需安装版本为：

Step 1: Install Development Tools

1.安装依赖 Development Tools

#<font color="#0000dd">On CentOS, RHEL & Fedora</font><br />

# yum group install ‘Development Tools‘ && yum install perl-core libtemplate-perl zlib-devel

‘On Ubuntu & Debian‘

$ sudo apt update && apt install build-essential checkinstall zlib1g-dev libtemplate-perl

Step 2: Compile OpenSSL from Sources

2.下载Openssl并解压

wget -c https://www.openssl.org/source/openssl-1.0.2p.tar.gz
tar -xzvf openssl-1.0.2p.tar.gz

3.编译安装

cd openssl-1.0.2k/
./config

make

出现如下字样，表示编译成功

make test

出现如下字样，表示编译测试成功

make install

出现如下字样，表示编译安装成功

4.查看已安装完成的Openssl

cd /usr/local/ssl

对以上文件进行解释：
bin – contains the openssl binary and some utility scripts.
include/openssl – contains the header files needed for building your own programs that use libcrypto or libssl.
lib -contains the OpenSSL library files.
lib/engines – contains the OpenSSL dynamically loadable engines.
man – contains the OpenSSL man-pages.
share/doc/openssl/html – contains HTML rendition of the man-pages.
certs – the default location for certificate files.
private – the default location for private key files.

5.检查Openssl版本信息

/usr/local/ssl/bin/openssl version
OpenSSL 1.0.2k  26 Jan 2017

6. 添加 /usr/local/ssl/bin/ 到环境变量

vim ~/.bashrc

在最后添加：

export PATH="/usr/local/ssl/bin:${PATH}"

保存文件，并使环境变量生效

source .bashrc

7. 查看环境变量是否添加成功

whereis openssl
openssl: /usr/bin/openssl /usr/lib64/openssl /usr/include/openssl /usr/local/ssl/bin/openssl /usr/share/man/man1/openssl.1ssl.gz

openssl version
OpenSSL 1.0.2k  26 Jan 2017

安装编译完成可以去编译nginx支持ssl模块了

openssl源码安装

原文：http://blog.51cto.com/13363488/2307995