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Our Devstack also failed due to this pycparser error. We just downgraded pycparser to 2.13 in require.txt / upper_requirement.txt and turned off the "tempest" service (this service will install cryptography and pycparser) in local.conf. After that, our Devstack installation was successful.
NOTE. Comment out the line 'RECLONE = yes' in the local.conf file.
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