Validate breaks on MacOS 10.5

[Manuel M T Chakravarty]

../compiler/ghc-inplace -optc-Werror -optc-Wall -optc-W -optc-Wstrict- 
prototypes -optc-Wmissing-prototypes -optc-Wmissing-declarations -optc- 
Winline -optc-Waggregate-return -optc-I../includes -optc-I. -optc- 
Iparallel -optc-Ism -optc-DCOMPILING_RTS -optc-fomit-frame-pointer - 
optc-I../gmp/gmpbuild -optc-I../libffi/build/include -optc-fno-strict- 
aliasing -Werror -H64m -O0 -fasm -optc-O2 -I../includes -I. -Iparallel  
-Ism -DCOMPILING_RTS -package-name rts -fvia-C -static  -I../gmp/ 
gmpbuild -I../libffi/build/include -I. -dcmm-lint     -c sm/GCUtils.c - 
o sm/GCUtils.o
cc1: warnings being treated as errors
sm/GCUtils.c: In function 'todo_block_full':

sm/GCUtils.c:182:0:
      warning: format '%ld' expects type 'long int', but argument 4  
has type 'int'
make[1]: *** [sm/GCUtils.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [stage1] Error 1
EthicsGradient-2 chak 17 (.../Code/ghc-test):