libgpg-error was added in 2017 (commit 76c8741060, Michael Biebl) to
gate HAVE_GCRYPT on its presence because src/resolve referenced
libgpg-error directly at the time. That usage is long gone — no source
file references any gpg-error API today — so the dependency only served
to fail HAVE_GCRYPT detection when gpg-error-dev wasn't installed.
libgcrypt's pkg-config Requires already pulls in the gpg-error headers
(via the transitive #include <gpg-error.h> in <gcrypt.h>), so dropping
the dep doesn't break compilation.
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