build fails: No rule to make target '/.../build/gdbserver/sim/riscv/libsim.a'

[hirooih]

How to reproduce:

sudo apt install verilator binutils-dev

git clone https://github.com/embecosm/riscv-toolchain.git
cd riscv-toolchain/
./clone-all.sh 
./checkout-all.sh 
./build-targets.sh 
./build-tools.sh --gdbserver-only --with-arch c

Fails as follows:

...
make[2]: *** No rule to make target '/home/hiroo/Work/GitHub/Embecosm/build/gdbserver/sim/riscv/libsim.a', needed by 'riscv32-gdbserver'.  Stop.
...

I took a look at build/gdbserver/server/Makefile. Certainly it has no rule for libsim.a.
(FYI It may not be relevant, but .../build/gdbserver/targets/gdbsim/.libs/libgdbsim.a, instead of libsim.a, is generated during the build process.)

The attached is the full log file from build-tool.sh.
build-2022-05-06-1803-FtEm.log

How can I build riscv-gdbserver?

Thanks.