When building the current master branch, I get an error when building the Sheepdog block driver: /Users/cwbetts/makestuff/qemu/block/sheepdog.c: In function ‘set_cork’: /Users/cwbetts/makestuff/qemu/block/sheepdog.c:903: error: ‘SOL_TCP’ undeclared (first use in this function) /Users/cwbetts/makestuff/qemu/block/sheepdog.c:903: error: (Each undeclared identifier is reported only once /Users/cwbetts/makestuff/qemu/block/sheepdog.c:903: error: for each function it appears in.) /Users/cwbetts/makestuff/qemu/block/sheepdog.c:903: error: ‘TCP_CORK’ undeclared (first use in this function) make: *** [block/sheepdog.o] Error 1 Any suggestions to fix them?