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< import os
---
> import os, subprocess
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> if env.get('CC'):
> m4env['CC'] = env['CC']
> if env.get('CXX'):
> m4env['CXX'] = env['CXX']
> # If we have gm4 use it
> if subprocess.Popen("gm4 --version", shell=True, stdout=subprocess.PIPE,
> stderr=subprocess.STDOUT, close_fds=True).communicate()[0].find('GNU') >= 0:
> m4env['M4'] = 'gm4'
>
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>