GNU Privacy Guard: a free PGP replacement This formula is keg-only.
Formula was removed
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gnupg@2.1 requires the following formulae to be installed:
pkg-config 0.29.2 Manage compile and link flags for libraries
npth 1.5 New GNU portable threads library
gnutls 3.5.16 GNU Transport Layer Security (TLS) Library
libgpg-error 1.27 Common error values for all GnuPG components
libgcrypt 1.8.1 Cryptographic library based on the code from GnuPG
libksba 1.3.5 X.509 and CMS library
libassuan 2.5.1 Assuan IPC Library
pinentry 1.1.0 Passphrase entry dialog utilizing the Assuan protocol
gettext GNU internationalization (i18n) and localization (l10n) library
adns 1.5.1 C/C++ resolver library and DNS resolver utilities
libusb 1.0.21 Library for USB device access
readline 7.0.3_1 Library for command-line editing

Recent formula history

ilovezfs gnupg@2.1: delete
Mike McQuaid gnupg@2.1: import from homebrew/versions.

Formula code at GitHub