Cloned the git repo onto a blank OS X install of OS X 10.13.6.
installed Qt 5.15.0, opened the project, tried to build.
FLAC/stream_decoder.h not found is the first error reported when trying to compile samplereaderflac.cpp
It seems your build system requirements for OS X are missing instructions to include:
the FLAC library and subsequent header files.
the PortAudio library and subsequent header files
the Vorbis library and subsequent header files
the OGG library and subsequent header files
Each of these libraries' source code repositories need to be cloned, and then their include folder that contains the missing header files needs to be copied to lib_mac/include
once these header files are added, the project will compile and run on OS X.
I'm going to guess that these header files are not included because of licensing issues.
Cloned the git repo onto a blank OS X install of OS X 10.13.6. installed Qt 5.15.0, opened the project, tried to build.
FLAC/stream_decoder.h
not found is the first error reported when trying to compilesamplereaderflac.cpp
It seems your build system requirements for OS X are missing instructions to include:
Each of these libraries' source code repositories need to be cloned, and then their
include
folder that contains the missing header files needs to be copied tolib_mac/include
once these header files are added, the project will compile and run on OS X.
I'm going to guess that these header files are not included because of licensing issues.