Simon, I'm getting this error when validating HEAD on 64 bit Linux: =================== "inplace/bin/ghc-stage1" -optc-fno-stack-protector -optc-Werror -optc-Wall -optc-Wall -optc-Wextra -optc-Wstrict-prototypes -optc-Wmissi ng-prototypes -optc-Wmissing-declarations -optc-Winline -optc-Waggregate-return -optc-Wpointer-arith -optc-Wmissing-noreturn -optc-Wnest ed-externs -optc-Wredundant-decls -optc-Iincludes -optc-Iincludes/dist -optc-Iincludes/dist-derivedconstants/header -optc-Iincludes/dist -ghcconstants/header -optc-Irts -optc-Irts/dist/build -optc-DCOMPILING_RTS -optc-fno-strict-aliasing -optc-fno-common -optc-O2 -optc-fom it-frame-pointer -optc-DRtsWay=\"rts_thr\" -static -optc-DTHREADED_RTS -H32m -O -Werror -Wall -H64m -O0 -Iincludes -Iincludes/dist -Iin cludes/dist-derivedconstants/header -Iincludes/dist-ghcconstants/header -Irts -Irts/dist/build -DCOMPILING_RTS -this-package-key rts -dcmm-lint -i -irts -irts/dist/build -irts/dist/build/autogen -Irts/dist/build -Irts/dist/build/autogen -O2 -c rts/posix/OSThreads.c -o rts/dist/build/posix/OSThreads.thr_o cc1: warnings being treated as errors rts/posix/OSThreads.c: In function ‘createOSThread’: rts/posix/OSThreads.c:132:40: error: unused parameter ‘name’ gmake[1]: *** [rts/dist/build/posix/OSThreads.thr_o] Error 1 =================== I believe this might be a result of your commit 674c631ea111233daa929ef63500d75ba0db8858 from Friday. Janek