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Order of the travis builds matters because of conda's "build:, host:" section dependencies (run-time dependencies .  These do not affect this order).  We believe pure-python packages should go in the first wave. These are the waves of builds that can be launched in parallel:

• libnl, libnl3, roentdek, amityping, prometheus-cpp, libusdusb4, psmon, networkfox, rogue, epix, lcls2_timetool, cameralink-gateway, lcls2-pgp-pcie-apps, xtcdata, ami
• rmda-core (depends on libnl), psalg (depends on xtcdata)
• fabric (depends rmda-core), psana (depends on psalg)
• psana/psdaq (depend on psalg, fabric)ami (depends on psana)

If a package is built for python build matrix tells it to build for the officially supported conda-forge versions (3.6,3.7,3.8).

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