I attempted to rebase my fix for #11487, but I can no longer validate. The culprit is 6c7760b2. I am seeing the errors below under linux, building with 7.10.3. Herbert, I hope there is a quick fix? Thanks, Geoff libraries/unix/System/Posix/IO/Common.hsc:316:61: error: • Couldn't match type ‘()’ with ‘Base.CFLock’ Expected type: Ptr Base.CFLock Actual type: Ptr CFLock • In the third argument of ‘Base.c_fcntl_lock’, namely ‘p_flock’ In the second argument of ‘throwErrnoIfMinus1_’, namely ‘(Base.c_fcntl_lock fd (5) p_flock)’ In a stmt of a 'do' block: throwErrnoIfMinus1_ "getLock" (Base.c_fcntl_lock fd (5) p_flock) libraries/unix/System/Posix/IO/Common.hsc:364:61: error: • Couldn't match type ‘()’ with ‘Base.CFLock’ Expected type: Ptr Base.CFLock Actual type: Ptr CFLock • In the third argument of ‘Base.c_fcntl_lock’, namely ‘p_flock’ In the second argument of ‘throwErrnoIfMinus1_’, namely ‘(Base.c_fcntl_lock fd (6) p_flock)’ In the expression: throwErrnoIfMinus1_ "setLock" (Base.c_fcntl_lock fd (6) p_flock) libraries/unix/System/Posix/IO/Common.hsc:371:35: error: • Couldn't match type ‘()’ with ‘Base.CFLock’ Expected type: Ptr Base.CFLock Actual type: Ptr CFLock • In the third argument of ‘Base.c_fcntl_lock’, namely ‘p_flock’ In the second argument of ‘throwErrnoIfMinus1_’, namely ‘(Base.c_fcntl_lock fd (7) p_flock)’ In the expression: throwErrnoIfMinus1_ "waitToSetLock" (Base.c_fcntl_lock fd (7) p_flock)