Specify Boost location

[ms609]

Gets things running on Windows without edits to CMakeLists.txt

[bredelings]

Cool. Does this work without setting BOOST_LIBRARYDIR? If so, perhaps we should just set BOOST_ROOT.

[ms609]

I want to double-check that the issue I thought I'd solved by adding BOOST_LIBRARYDIR was not in fact related to needing to recompile Boost. I'm next on the affected machine on Monday so will mark this as draft until I can verify.

[bredelings]

Ah... I think if you compile boost and install it, then setting BOOST_ROOT to the installed location (not the build directory) is sufficient. However, if you set BOOST_ROOT to the build directory, then you may also need to set BOOST_LIBRARYDIR, because the library directory is in the wrong place relative to the root.

[bredelings]

See https://revbayes.github.io/compile-linux for an example setting the installed location.

Hmm.... boost-1.74 is no longer new...