File xorn-enable-guile-2.2.patch of Package geda-gaf
diff -up geda-gaf-1.10.0/xorn/configure.ac.ssss geda-gaf-1.10.0/xorn/configure.ac
--- geda-gaf-1.10.0/xorn/configure.ac.ssss 2019-10-10 15:53:03.000000000 +0200
+++ geda-gaf-1.10.0/xorn/configure.ac 2019-10-10 15:53:23.000000000 +0200
@@ -30,7 +30,7 @@ AC_PROG_CXX
AM_PATH_PYTHON([2.7])
PKG_CHECK_MODULES([PYTHON], [python2 >= 2.7])
-PKG_CHECK_MODULES([GUILE], [guile-2.0 >= 2.0.10])
+PKG_CHECK_MODULES([GUILE], [guile-2.2 >= 2.0.10])
AM_GNU_GETTEXT([external])
AM_GNU_GETTEXT_VERSION([0.18.2])