--- autogen-5.18.16/agen5/guile-iface.h.orig	2020-11-28 10:36:31.397903848 +0000
+++ autogen-5.18.16/agen5/guile-iface.h	2020-11-28 10:36:45.329662872 +0000
@@ -9,16 +9,12 @@
 # error AutoGen does not work with this version of Guile
   choke me.
 
-#elif GUILE_VERSION < 203000
+#else
 # define AG_SCM_IS_PROC(_p)           scm_is_true( scm_procedure_p(_p))
 # define AG_SCM_LIST_P(_l)            scm_is_true( scm_list_p(_l))
 # define AG_SCM_PAIR_P(_p)            scm_is_true( scm_pair_p(_p))
 # define AG_SCM_TO_LONG(_v)           scm_to_long(_v)
 # define AG_SCM_TO_ULONG(_v)          ((unsigned long)scm_to_ulong(_v))
-
-#else
-# error unknown GUILE_VERSION
-  choke me.
 #endif
 
 #endif /* MUTATING_GUILE_IFACE_H_GUARD */