In order to build the 240p Test for Genesis download the
SGDK 1.11 branck from 2014 located at: 

https://github.com/ArtemioUrbina/SGDK_1_11_Suite

Please change the sgdk.bat file to point to your installation
and run the compile_genesis.bat file from the 240p test suite
folder

For Sega CD, you should update the SCD_LOADER path in the
sgdk.bat file to point to the suitable folder (included in the
240p test suite for Genesis) and then run the compile_segaCD.bat
file from the 240p test suite folder

If the PCM sub program for the Sega CD is changed, run
buildscdpcmcheck.bat from the utilities folder and update
resources.res so that it is linked.