ubuntu error: SSL modules require the OpenSSL library.

 + ngx_http_echo_module was configured

checking for PCRE library ... found

checking for PCRE JIT support ... not found

checking for OpenSSL library ... not found

./configure: error: SSL modules require the OpenSSL library.

You can either do not enable the modules, or install the OpenSSL library

into the system, or build the OpenSSL library statically from the source

with nginx by using --with-openssl=<path> option.

 解决办法：

   sudo apt-get install openssl libssl-dev