This happens on systems where /usr/include/linux is not a symbolic link to /usr/src/linux/include/linux. The complete error message is:
lidsadm.c:30: linux/lidsext.h: No such file or directory make: *** [lidsadm.o] Error 1
To fix this problem, edit the Makefile in the lidsadm source directory and add -I/usr/src/linux/include to the CFLAGS option.
At this point, you should be able to compile lidsadm normally.