Support older MacOS than 12

[kgoba]

Hi, for those of us still running older hardware perfectly capable of running BrewTarget, yet not supporting the newer MacOS, is there a reason to be limited to v2.3.0?

I was able to build BrewTarget v3.0.7 on MacOS 10.13. My steps:

1. Install MacPorts
2. Run sudo port install clang-16 xalanc xercesc3 boost179 qt513
3. Clone the brewtarget repository and create a build folder
4. Run CC=clang-mp-16 CXX=clang++-mp-16 cmake <path_to_repo> -DBoost_INCLUDE_DIR=/opt/local/libexec/boost/1.79/include
5. Run make -j4 or something similar.

Note that I might be missing some other dependencies I had installed prior via MacPorts. I guess cmake could be one of them.

[matty0ung]

Glad you got it working. If you are feeling adventurous, have a look at https://github.com/Brewtarget/brewtarget/blob/develop/bt

The intention is that, once you have Python installed, you can get everything else installed automatically by running ./bt setup all. I have not tried this on an older version of MacOS, but it's used on the nightly GitHub builds.