The OS X buildbots fail to compile posixmodule.c:

gcc -fno-strict-aliasing -g -O0 -Wall -Wstrict-prototypes    -I. -I./Include    -DPy_BUILD_CORE  -c ./Modules/posixmodule.c -o Modules/posixmodule.o
./Modules/posixmodule.c: In function ‘try_getxattr’:
./Modules/posixmodule.c:10045: error: ‘XATTR_SIZE_MAX’ undeclared (first use in this function)
./Modules/posixmodule.c:10045: error: (Each undeclared identifier is reported only once
./Modules/posixmodule.c:10045: error: for each function it appears in.)
./Modules/posixmodule.c: In function ‘getxattr_common’:
./Modules/posixmodule.c:10083: error: ‘XATTR_SIZE_MAX’ undeclared (first use in this function)
./Modules/posixmodule.c: In function ‘posix_getxattr’:
./Modules/posixmodule.c:10101: warning: passing argument 3 of ‘getxattr_common’ from incompatible pointer type
./Modules/posixmodule.c: In function ‘posix_lgetxattr’:
./Modules/posixmodule.c:10119: error: ‘lgetxattr’ undeclared (first use in this function)
./Modules/posixmodule.c: In function ‘wrap_fgetxattr’:
./Modules/posixmodule.c:10129: error: too few arguments to function ‘fgetxattr’
./Modules/posixmodule.c:10130: warning: control reaches end of non-void function
./Modules/posixmodule.c: In function ‘posix_setxattr’:
./Modules/posixmodule.c:10165: error: too few arguments to function ‘setxattr’
./Modules/posixmodule.c: In function ‘posix_lsetxattr’:
./Modules/posixmodule.c:10190: warning: implicit declaration of function ‘lsetxattr’
./Modules/posixmodule.c: In function ‘posix_fsetxattr’:
./Modules/posixmodule.c:10216: error: too few arguments to function ‘fsetxattr’
./Modules/posixmodule.c: In function ‘posix_removexattr’:
./Modules/posixmodule.c:10239: error: too few arguments to function ‘removexattr’
./Modules/posixmodule.c: In function ‘posix_lremovexattr’:
./Modules/posixmodule.c:10262: warning: implicit declaration of function ‘lremovexattr’
./Modules/posixmodule.c: In function ‘posix_fremovexattr’:
./Modules/posixmodule.c:10285: error: too few arguments to function ‘fremovexattr’
./Modules/posixmodule.c: In function ‘listxattr_common’:
./Modules/posixmodule.c:10327: error: ‘XATTR_LIST_MAX’ undeclared (first use in this function)
./Modules/posixmodule.c: In function ‘posix_listxattr’:
./Modules/posixmodule.c:10369: warning: passing argument 2 of ‘listxattr_common’ from incompatible pointer type
./Modules/posixmodule.c: In function ‘posix_llistxattr’:
./Modules/posixmodule.c:10385: error: ‘llistxattr’ undeclared (first use in this function)
./Modules/posixmodule.c: In function ‘wrap_flistxattr’:
./Modules/posixmodule.c:10394: error: too few arguments to function ‘flistxattr’
./Modules/posixmodule.c:10395: warning: control reaches end of non-void function
./Modules/posixmodule.c: In function ‘all_ins’:
./Modules/posixmodule.c:11342: error: ‘XATTR_SIZE_MAX’ undeclared (first use in this function)
make: *** [Modules/posixmodule.o] Error 1
program finished with exit code 2
elapsedTime=20.601350