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-rw-r--r--lib/mkmf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index a6ec9bae5d..79bb96ba75 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -2076,6 +2076,7 @@ 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 = $(RUBY)
ruby_headers = #{headers.join(' ')}
RM = #{config_string('RM', &possible_command) || '$(RUBY) -run -e rm -- -f'}