https://bugs.gentoo.org/473970

already sent upstream

patch by Jungshik Shin

--- ragel-6.7/configure.in
+++ ragel-6.7/configure.in
@@ -27,9 +27,9 @@
 
 dnl Choose defaults for the build_parsers and build_manual vars. If the dist
 dnl file is present in the root then default to no, otherwise go for it.
-AC_CHECK_FILES( $srcdir/DIST, 
-	[ . $srcdir/DIST; ], 
-	[ build_parsers=yes; build_manual=yes; ] )
+
+AS_IF([test -r $srcdir/DIST], [. $srcdir/DIST], [build_parsers=yes;
+       build_manual=yes])
 
 dnl
 dnl Enable arg to explicitly control the building of the manual