diff --git a/contrib/crossrpms/acinclude.m4 b/contrib/crossrpms/acinclude.m4
new file mode 100644
index 0000000000..28ad8d504a
--- /dev/null
+++ b/contrib/crossrpms/acinclude.m4
@@ -0,0 +1,20 @@
+# RTEMS_CANONICAL_SPLIT(THING)
+# --------------------------
+# Generate the variables THING, THING_{alias cpu vendor os}.
+m4_define([RTEMS_CANONICAL_SPLIT],
+[case $ac_cv_$1 in
+*-*-*) ;;
+*) AC_MSG_ERROR([invalid value of canonical $1]);;
+esac
+ac_save_IFS=$IFS; IFS='-'
+set x $ac_cv_$1
+shift
+$1_cpu=$[1]
+$1_vendor=$[2]
+shift; shift
+[# Remember, the first character of IFS is used to create $]*,
+# except with old shells:
+$1_os=$[*]
+IFS=$ac_save_IFS
+case $$1_os in *\ *) $1_os=`echo "$$1_os" | sed 's/ /-/g'`;; esac
+])# RTEMS_CANONICAL_SPLIT