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File: //usr/local/rvm/src/ruby-2.6.8/tool/m4/ruby_append_option.m4

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