Test report by @zao
FAILED
Build succeeded for 0 out of 2 (2 easyconfigs in total)
eb-u2004 - Linux Ubuntu 20.04, x86_64, Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz, Python 3.8.5
See https://gist.github.com/5b7258cdbfa635a1e4985fb7a601c157 for a full test report.

• A build dependency on CMake is needed.
• Is the tar dance with the sources necessary, can't it be handled with filename and/or download_filename?
• Normally sources_urls is separate from the sources list unless there's a need to avoid collisions.

Test report by @zao
SUCCESS
Build succeeded for 2 out of 2 (2 easyconfigs in total)
eb-u2004 - Linux Ubuntu 20.04, x86_64, Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz, Python 3.8.5
See https://gist.github.com/71a1f38194c7b56ab3f8df99560a1d0c for a full test report.

Test report by @lexming
SUCCESS
Build succeeded for 2 out of 2 (2 easyconfigs in total)
node354.hydra.os - Linux centos linux 7.9.2009, x86_64, Intel(R) Xeon(R) Gold 6148 CPU @ 2.40GHz, Python 2.7.5
See https://gist.github.com/19f691531823416295fb84f59bd55347 for a full test report.

Going in, thanks @alinelena !