Buildbot notes for Linux

export EXTERNAL_BUILD_FLAGS="MAKEJOBS=-j3  SDKVERSION=10.7 HOST_CC=clang HOST_YACC=yacc \
HOST_BISON=bison HOST_FLEX=flex HOST_CODESIGN=/bin/true BUILD_NO_DEBUG=1 \
DEPLOYMENT_TARGET_FLAGS=  RC_CFLAGS=\"-D__arm__ -DARM\" MIG=/usr/bin/mig CC=clang \
CXX=clang++ RC_CFLAGS=\"-target arm-apple-darwin11\"      RC_LDFLAGS=\"-target arm-apple-darwin11" \
/usr/lib/libclang_rt.cc_kext.a\"     STRIP=\"arm-apple-darwin11-strip\""; ./xnu-build

Use that command.