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@@ -1,5 +1,8 @@
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 #!/usr/bin/env ruby
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 require 'fileutils'
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+require 'tmpdir'
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+
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+TMP = Dir::tmpdir
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 def usage(msg = nil)
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   puts "Error: #{msg}" if msg
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@@ -18,16 +21,16 @@ def usage(msg = nil)
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   puts "    ..."
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   puts "  end"
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   puts
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-  puts "A copy of the old file will be left under /tmp/ in case this script just seriously screws up"
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+  puts "A copy of the old file will be left under #{TMP} in case\nthis script just seriously screws up"
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   puts
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   exit (msg ? 2 : 0)
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 end
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 usage("Wrong number of arguments.") unless ARGV.size == 1
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-usage("This system doesn't have a /tmp directory.  wtf?") unless File.directory?('/tmp')
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+usage("Temp directory '#{TMP}' is not valid. Set TMPDIR environment variable to a writeable directory.") unless File.directory?(TMP) && File.writable?(TMP)
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 file = ARGV.shift
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-tmpfile = "/tmp/#{File.basename(file)}"
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+tmpfile = File.join(TMP, File.basename(file))
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 usage("File '#{file}' doesn't exist") unless File.exists?(file)
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 FileUtils.cp(file, tmpfile)