Linux build

A few fixes to readme #1450

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Run time

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Job	Run time
Linux -> Pre-checks	23s
Linux -> GCC-x64, Debug	12m 46s
Linux -> GCC-x64, Release	11m 3s
Linux -> Clang-x64, Debug	13m 16s
Linux -> Clang-x64, Release	12m 37s
	50m 5s