From aa21a775a652098d7c27ab86e365d205314685fd Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Fri, 19 Jun 2020 14:42:26 +0900
Subject: [PATCH] Configure only directories having extconf.rb

---
 template/configure-ext.mk.tmpl | 1 +
 1 file changed, 1 insertion(+)

diff --git a/template/configure-ext.mk.tmpl b/template/configure-ext.mk.tmpl
index 630e4a10dc..9921e2225b 100644
--- a/template/configure-ext.mk.tmpl
+++ b/template/configure-ext.mk.tmpl
@@ -32,6 +32,7 @@ gems:
 
 % exts.each do |t, (o, dirs)|
 %   dirs.each do |d|
+%     next if Dir.glob("#{srcdir}/#{d}/**/extconf.rb").empty?
 <%=t%>: <%=d%>/exts.mk
 <%=d%>/exts.mk: FORCE
 	$(Q)$(MINIRUBY) $(srcdir)/ext/extmk.rb --make='$(MAKE)' \