From fe61f14d53c5b18d3c475eee23502ab1e5446291 Mon Sep 17 00:00:00 2001
From: hsbt <hsbt@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 1 Mar 2019 03:45:00 +0000
Subject: Support YACC environment variable for ripper.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67149 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ext/ripper/depend     | 1 -
 ext/ripper/extconf.rb | 6 ++++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/ext/ripper/depend b/ext/ripper/depend
index 1bd3e6532c..8b7eab0217 100644
--- a/ext/ripper/depend
+++ b/ext/ripper/depend
@@ -1,7 +1,6 @@
 GEN  = $(srcdir)/tools/generate.rb
 SRC1 = $(top_srcdir)/parse.y
 SRC2 = $(srcdir)/eventids2.c
-BISON = bison
 
 .SUFFIXES: .y
 
diff --git a/ext/ripper/extconf.rb b/ext/ripper/extconf.rb
index 89b46abcfd..6a793b8699 100644
--- a/ext/ripper/extconf.rb
+++ b/ext/ripper/extconf.rb
@@ -5,7 +5,7 @@ require 'mkmf'
 require 'rbconfig'
 
 def main
-  unless find_executable('bison')
+  unless find_executable(ENV["YACC"] || 'bison')
     unless File.exist?('ripper.c') or File.exist?("#{$srcdir}/ripper.c")
       raise 'missing bison; abort'
     end
@@ -16,7 +16,9 @@ def main
   $defs << '-DRIPPER_DEBUG' if $debug
   $VPATH << '$(topdir)' << '$(top_srcdir)'
   $INCFLAGS << ' -I$(topdir) -I$(top_srcdir)'
-  create_makefile 'ripper'
+  create_makefile 'ripper' do |conf|
+    conf << "BISON = #{ENV['YACC'] || 'bison'}"
+  end
 end
 
 main
-- 
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