Thanks for your report.
Something has probably gone wrong with a previous install.
You can solve this by running the following command:
sudo apt-get install --reinstall libgl1-mesa-dev
Let us known if this fixes your problem.
** Changed in: mesa (Ubuntu)
Status: New => Incomplete
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package libgl1-mesa-dev 7.0.3~rc2-1ubuntu3 failed to install/upgrade:
https://bugs.launchpad.net/bugs/298130
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