From 544605f0a361a2867c1aa23fea3e14a512cede4d Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 2 Apr 2018 04:44:35 +0000
Subject: Improve mkmf error message

* lib/mkmf.rb: Improve the error message when ruby.h is missing,
  to suggest installing separate packages.  [Feature #14656]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63061 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/mkmf.rb | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'lib/mkmf.rb')

diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 773cf9b7e7..63cb6182e2 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -241,7 +241,12 @@ module MakeMakefile
     $topdir ||= RbConfig::CONFIG["topdir"]
     $arch_hdrdir = "$(extout)/include/$(arch)"
   else
-    abort "mkmf.rb can't find header files for ruby at #{$hdrdir}/ruby.h"
+    abort <<MESSAGE
+mkmf.rb can't find header files for ruby at #{$hdrdir}/ruby.h
+
+You might have to install separate package for the ruby development
+environment, ruby-dev or ruby-devel for example.
+MESSAGE
   end
 
   CONFTEST = "conftest".freeze
-- 
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