Upgrading the kernel to 2.6.31(couldn get 2.6.33 to work at all) on Etch, I
stumbled over this:
> cc -m32 -Wall -Wmissing-declarations -Wmissing-prototypes -O3 -I../../include
-I../../arch/x86/include -U_FORTIFY_SOURCE lguest.c -o lguest
lguest.c:21:25: error: sys/eventfd.h: No