GPGME (GnuPG Made Easy) is a C language library that allows to add
support for cryptography to a program. It is designed to make access
to public key crypto engines like GnuPG or GpgSM easier for
applications. GPGME provides a high-level crypto API for encryption,
decryption, signing, signature verification and key management.

Required dep: libgpg-error, available at slackbuilds.org