Libassuan is the IPC library used by GnuPG version 2
Libassuan is the IPC library used by gpg2 (GnuPG version 2)
gpgme also uses libassuan to communicate with a libassuan-enabled GnuPG
v2 server, but it uses it's own copy of libassuan.
As of libassuan-1.0.1 and libassuan-1.0.2, there only exists static
libassuan, so libassuan-devel is the package with the library.