--- configure.ac	2017-02-13 14:34:06.983449082 +0100
+++ configure.ac	2017-02-13 15:36:50.944653536 +0100
@@ -399,7 +399,14 @@
 
 
 # Checking for libgpg-error.
-AM_PATH_GPG_ERROR(1.17,, AC_MSG_ERROR([libgpg-error was not found]))
+if test "${GPG_ERROR_CFLAGS+set}" != "set"; then
+  AM_PATH_GPG_ERROR(1.17,, AC_MSG_ERROR([libgpg-error was not found]))
+else
+  GPG_ERROR_CFLAGS="$GPG_ERROR_CFLAGS"
+  GPG_ERROR_LIBS="$GPG_ERROR_LIBS"
+  AC_SUBST(GPG_ERROR_CFLAGS)
+  AC_SUBST(GPG_ERROR_LIBS)
+fi
 AM_CONDITIONAL(USE_GPGRT_CONFIG, [test -n "$GPGRT_CONFIG" \
                                   -a "$ac_cv_path_GPG_ERROR_CONFIG" = no])