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ruby--ruby/tool/m4/ruby_prepend_option.m4
shyouhei 5839396028 Emacs friendliness [ci skip]
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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61983 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2018-01-20 07:14:59 +00:00

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# -*- Autoconf -*-
AC_DEFUN([RUBY_PREPEND_OPTION],
[# RUBY_PREPEND_OPTION($1)
AS_CASE([" [$]{$1-} "],
[*" $2 "*], [], [' '], [ $1="$2"], [ $1="$2 [$]$1"])])dnl