wodz@skatol:~/rockbox/build$ make clean
Cleaning build directory
wodz@skatol:~/rockbox/build$ make
Generating dependencies
CC firmware/common/ctype.c
PP features.txt
CC lang_core.c
make: *** No rule to make target `/home/wodz/rockbox/build/viewport.h', needed by `/home/wodz/rockbox/build/apps/action.o'.  Stop.