If you install to a directory that doesn't exist, it copies libjson.a to the *file* lib, rather than the directory lib/
See attached build.log file, it needs to make the lib directory too.
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Also, if you enable mempool++ and libbase64++, it also needs to copy the Dependencies folder to install/include, ie:
cp -rv libjson/Dependencies/ install/include/
Otherwise you get compile errors like so:
libjson/install/include/libjson/Source/JSON_Base64.h:7 col 53: error: ../Dependencies/libbase64++/libbase64++.h: No such file or directory
Sorry, I mean,
cp -rv libjson/Dependencies/ install/include/libjson/
Thank you, I have fixed this in the next version.