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Anthony Mallet authored
Selecting among ros versions does not make much sense anymore, so drop the corresponding package alternative and use whatever system version is there (see comments in issue #391). System packages are searched in /opt/ros/{noetic,melodic} only, in this order, but this can be tuned in user configuration if needed. Individual DEPEND_ABI.* can still be used for packages that have specific requirements. They have be set to match any ros version more recent than 'lunar' by default.
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