$ curl -O https://www.openssl.org/source/openssl-VERSION.tar.gz
   $ tar xzf openssl-VERSION
   $ pushd openssl-VERSION
   $ ./config \
        --prefix=/usr/local/custom-openssl \
        --libdir=lib \
        --openssldir=/etc/ssl
   $ make -j1 depend
   $ make -j8
   $ make install_sw
   $ popd