fix build with system gpgme

Change-Id: I00e6d6ce476adbd22bcfb4eb55d4db4194f4bc92

config_host/config_gpgme.h.in

+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/* Configuration for gpgme++.
+ */
+
+// Defined if gpgme supports exporting minimal key.
+#define GPGME_CAN_EXPORT_MINIMAL_KEY 0
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

configure.ac

@@ -10242,6 +10242,7 @@ if test "$_os" = "Linux"; then
     else
         AC_MSG_RESULT([internal])
         BUILD_TYPE="$BUILD_TYPE LIBGPGERROR LIBASSUAN GPGMEPP"
+        AC_DEFINE([GPGME_CAN_EXPORT_MINIMAL_KEY])
 
         GPG_ERROR_CFLAGS="-I${WORKDIR}/UnpackedTarball/libgpg-error/src"
         GPG_ERROR_LIBS="-L${WORKDIR}/UnpackedTarball/libgpg-error/src/.libs -lgpg-error"
@@ -12353,6 +12354,7 @@ AC_CONFIG_HEADERS([config_host/config_firebird.h])
 AC_CONFIG_HEADERS([config_host/config_folders.h])
 AC_CONFIG_HEADERS([config_host/config_gio.h])
 AC_CONFIG_HEADERS([config_host/config_global.h])
+AC_CONFIG_HEADERS([config_host/config_gpgme.h])
 AC_CONFIG_HEADERS([config_host/config_java.h])
 AC_CONFIG_HEADERS([config_host/config_lgpl.h])
 AC_CONFIG_HEADERS([config_host/config_libepubgen.h])

xmlsecurity/source/gpg/CertificateImpl.cxx

@@ -7,6 +7,8 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
+#include <config_gpgme.h>
+
 #include "CertificateImpl.hxx"
 
 #include <comphelper/servicehelper.hxx>
@@ -215,8 +217,11 @@ void CertificateImpl::setCertificate(GpgME::Context* ctx, const GpgME::Key& key)
     ctx->setArmor(false); // caller will base64-encode anyway
     GpgME::Error err = ctx->exportPublicKeys(
         key.primaryFingerprint(),
-        data_out,
-        officecfg::Office::Common::Security::OpenPGP::MinimalKeyExport::get());
+        data_out
+#if GPGME_CAN_EXPORT_MINIMAL_KEY
+        , officecfg::Office::Common::Security::OpenPGP::MinimalKeyExport::get()
+#endif
+    );
 
     if (err)
         throw RuntimeException("The GpgME library failed to retrieve the public key");