json_spirit requires the following formulae to be installed:
boost 1.66.0 Collection of portable C++ source libraries
cmake 3.10.3 Cross-platform make

Recent formula history

Viktor Szakats json_spirit: use secure homepage and follow redirect
Nikolaus Wittenstein Add descriptions to all remaining homebrew packages
Mike McQuaid formulae: don't use GitHub zip files.
Francisco Facioni json_spirit dylib generation + static
Francisco Facioni json_spirit 4.07

Formula code at GitHub