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Newer CGAL versions build into lib64, breaking current CGAL make rules.

On 64-bit systems, the system installations of boost, cgal are under lib64/. The behaviour for a ThirdParty build is mostly lib/ but this can also be changing.

  • Boost 1_62_0 and older build into 'lib/'.
  • CGAL-4.9 builds into 'lib64/', older versions into 'lib/'.

Future-proof things by using lib$WM_COMPILER_LIB_ARCH for boost and cgal build rules, and forcing these as build targets in the ThirdParty makeCGAL as well.

Cross-referenced as ThirdParty issue https://develop.openfoam.com/Development/ThirdParty-plus/issues/8