diff --git a/contrib/crossrpms/mkspec.am b/contrib/crossrpms/mkspec.am
new file mode 100644
index 0000000000..91689cfdb3
--- /dev/null
+++ b/contrib/crossrpms/mkspec.am
@@ -0,0 +1,5 @@
+MKSPEC = sed \
+	  -e "s,[@]rpmprefix[@],$(rpmprefix),g" \
+	  -e "s,[@]_prefix[@],$(prefix),g" \
+	  -e "s/[@]tool_target[@]/$(TARGET)/g" \
+	  -e "/[@]PATCH/d"