configure: error: Cannot find OpenSSL's

When compiling a software package that is dependent on OpenSSL, it might happen that your compiler will give you the following error:

configure: error: Cannot find OpenSSL’s <evp.h> or <hmac.h>

in this case, the compiler wants to tell you that you haven’t the openSSL developer library installed. Do so by:

sudo apt-get install openssl-dev

on some systems, like Ubuntu Feisty, you might need to use this command:

sudo apt-get install libcurl3-openssl-dev