1 files changed, 1 insertions, 9 deletions
diff --git a/ext/ripper/extconf.rb b/ext/ripper/extconf.rb
index fd9370c337..adf02cb3e4 100644
--- a/ext/ripper/extconf.rb
+++ b/ext/ripper/extconf.rb
@@ -4,7 +4,7 @@ require 'mkmf'
 require 'rbconfig'
 
 def main
-  unless have_command('bison')
+  unless find_executable('bison')
     unless File.exist?('ripper.c') or File.exist?("#{$srcdir}/ripper.c")
       $stderr.puts 'missing bison; abort'
       exit 1
@@ -17,12 +17,4 @@ def main
   create_makefile 'ripper'
 end
 
-def have_command(cmd)
-  checking_for(cmd) {
-    ENV['PATH'].split(File::PATH_SEPARATOR).any? {|path|
-      File.executable?("#{path}/#{cmd}#{Config::CONFIG['EXEEXT']}")
-    }
-  }
-end
-
 main