makefile edits
The original goal was to build outside source tree. That wasn't too difficult. There's enough Gnu-make conformance changes here I hope it will be accepted.
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'make install' (in/out tree) works from un-built tree
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'make dist' (in/out tree) works from un-built tree
...
To build outside tree:
make -f path_to_RS/Makefile TARGET
The docker targets haven't been tested but I'm not getting in to that today.