Hi,
I checked out l4linux-2.6-env, and typed make config, and selected a DROPS_DIR of /home/cburgess/drops I then typed make and it eventually failed to find l4/sys/types.h trying to build log-server
The build order seems to be broken. I managed to build l4linux-2.6-env by descending to l4/pkg/ and build some subdirs there first. That will also generate the missing header files.
Hope that helps. But this is a bug and the makefile should be fixed of course.
Stefan