Builing HEAD fails under OSX 10.9/Xcode5/clang at OSMem.c

Recent changes to OSMem.c brings a build failure on OS X 10.9

/dist/build/autogen -Irts/dist/build -Irts/dist/build/autogen           -O2    -c rts/posix/OSMem.c -o rts/dist/build/posix/OSMem.o

rts/posix/OSMem.c:274:23:
     error: use of undeclared identifier '_SC_PHYS_PAGES'
            ret = sysconf(_SC_PHYS_PAGES);
                          ^
1 error generated.
make[1]: *** [rts/dist/build/posix/OSMem.o] Error 1
make: *** [all] Error 2

looking at man sysconf:

These values also exist, but may not be standard:

     _SC_PHYS_PAGES
             The number of pages of physical memory.  Note that it is possible that the product of this value and the value of _SC_PAGESIZE
             will overflow a long in some configurations on a 32bit machine.

I bootstrapped with a homebrew ghc compiled with a homebrew gcc 4.8

Trac metadata

Trac field	Value
Version	7.6.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture