Hi, Having updated to CVS HEAD, I get the following error when compiling the lisp kernel: ../xlbt.c: In function ‘plbt_sp’: ../xlbt.c:138: error: invalid operands to binary >> make: *** [xlbt.o] Error 1 Using: gcc (GCC) 4.0.2 20050808 (prerelease) (Ubuntu 4.0.1-4ubuntu9) I added a cast to unsigned long and it built. James