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-rw-r--r--lib/mkmf.rb5
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index eabccd48eb..bb2bdc01e9 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -2034,6 +2034,11 @@ sitearch = #{CONFIG['sitearch']}
ruby_version = #{RbConfig::CONFIG['ruby_version']}
ruby = #{$ruby.sub(%r[\A#{Regexp.quote(RbConfig::CONFIG['bindir'])}(?=/|\z)]) {'$(bindir)'}}
RUBY = $(ruby#{sep})
+BUILTRUBY = #{if defined?($builtruby) && $builtruby
+ $builtruby
+ else
+ File.join('$(bindir)', CONFIG["RUBY_INSTALL_NAME"] + CONFIG['EXEEXT'])
+ end}
ruby_headers = #{headers.join(' ')}
RM = #{config_string('RM', &possible_command) || '$(RUBY) -run -e rm -- -f'}