base-hw rpi: compiling UART driver fails

[Nobody III]

When I try to compile the genode UART driver for the raspberry pi, I get
the following output:

  Program drivers/uart/pl011/uart_drv
    COMPILE  main.o
/home/kingtux/Downloads/genode-master/repos/os/src/drivers/uart/pl011/main.cc:17:24:
fatal error: pl011_defs.h: No such file or directory
compilation terminated.
/home/kingtux/Downloads/genode-master/repos/base/mk/generic.mk:56: recipe
for target 'main.o' failed
make[2]: *** [main.o] Error 1
var/libdeps:1771: recipe for target 'uart_drv.prg' failed
make[1]: *** [uart_drv.prg] Error 2
Makefile:209: recipe for target 'gen_deps_and_build_targets' failed
make: *** [gen_deps_and_build_targets] Error 2

Can anyone fix this or help me understand what's going on?
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