macOS Mojave - installing jasonnnet fails

[dcfidalgo]

On macOS Mojave, the jsonnet install fails:

  1 warning generated.
  clang: warning: libstdc++ is deprecated; move to libc++ with a minimum deployment target of OS X 10.9 [-Wdeprecated]
  ld: library not found for -lstdc++
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  error: Setup script exited with error: command 'g++' failed with exit status 1
  make: *** [dev] Error 1 

A working solution can be found here: google/jsonnet#573 (comment)

It's basically

$ xcode-select --install
$ open /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg

[dcfidalgo]

@ignacioct just encountered this issue when he tried to install biome.text. Our solution was to install jsonnet via conda:
conda install jsonnet -c conda-forge.