Build it using general C development environment with bash, gcc (3 or 4 series), make, etc on a linux machine.
Building pre-requirements are:
1. openssl binaries; 2. openssl development package with include files (on debian package libssl-dev);
OpenSSL binaries are provided by package
openssl. It "contains the openssl binary and related tools" (from openssl package description).
OpenSSL development package is
libssl-dev. "SSL development libraries, header files and documentation" (from libssl-dev package description).