I was not able to find where the NoDbgRegParms flag is set (Perhaps somebody's dev env or in Jenkins) but setting it empty in the mvm on the CFLAGS line works.

 CFLAGS="$OPT -msse2 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -DCOGMTVM=0 -DNoDbgRegParms= " \

Having solved the 'compile using the old build system on my boxen' problem I will be returning to the Squeak coding tomorrow.

cheers.

tty