https://bugs.gentoo.org/865321
https://lists.freedesktop.org/archives/libreoffice/2022-August/089261.html
https://github.com/LibreOffice/core/commit/aa0b2b756c17d43d2e8c828a909ee2815e332377

From: Rene Engelhard <rene@debian.org>
Date: Wed, 24 Aug 2022 09:55:33 +0200
Subject: [PATCH] Make configure work with gpgme >= 1.18
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Sam James wrote:
> gpgme-1.18.0 dropped a bunch of internal symbols,
> including progress_callback (see e.g. callbacks.h
> which has a comment at the top saying it's internal).

Plausibly the workaround to not link against older KDE-specific distro
packages is not needed anymore.

Check for main as a workaround as we do for other C++ libraries, too.

Change-Id: I57065a5b5b23b9eadb73b01e4f3a289552c3bde4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/138667
Tested-by: Jenkins
Reviewed-by: Sam James <sam@gentoo.org>
Reviewed-by: René Engelhard <rene@debian.org>
(cherry picked from commit b4a94d681a99a6a3eeb6aaa4d2f4dfab8f7c000b)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/138553
Tested-by: René Engelhard <rene@debian.org>
--- a/configure.ac
+++ b/configure.ac
@@ -12537,12 +12537,11 @@ elif test \( \( "$_os" = "Linux" -o "$_os" = "Darwin" \) -a "$ENABLE_NSS" = TRUE
         # C++ library doesn't come with fancy gpgmepp-config, check for headers the old-fashioned way
         AC_CHECK_HEADER(gpgme++/gpgmepp_version.h, [ GPGMEPP_CFLAGS=-I/usr/include/gpgme++ ],
             [AC_MSG_ERROR([gpgmepp headers not found, install gpgmepp >= 1.14 development package])], [])
-        # progress_callback is the only func with plain C linkage
-        # checking for it also filters out older, KDE-dependent libgpgmepp versions
-        AC_CHECK_LIB(gpgmepp, progress_callback, [ GPGMEPP_LIBS=-lgpgmepp ],
-            [AC_MSG_ERROR(gpgmepp not found or not functional)], [])
         AC_CHECK_HEADER(gpgme.h, [],
             [AC_MSG_ERROR([gpgme headers not found, install gpgme development package])], [])
+        AC_CHECK_LIB(gpgmepp, main, [],
+            [AC_MSG_ERROR(gpgmepp not found or not functional)], [])
+	GPGMEPP_LIBS=-lgpgmepp
     else
         AC_MSG_RESULT([internal])
         BUILD_TYPE="$BUILD_TYPE LIBGPGERROR LIBASSUAN GPGMEPP"