Initially reported by: NiLuJe
URL: https://github.com/NiLuJe/crosstool-ng

Comment:
PocketBook
i.MX5 & up. Based on the awfully old original SDK, hence the oldies.
Possibly prefer the new, upstream Clang SDKs if possible:
https://github.com/pocketbook/SDK_6.3.0
it's for i.MX6 & up, a BR GCC 6.3.0 + Clang 7 TC, on glibc 2.23 / Linux 3.0.35

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WARNING! This sample may enable experimental features.
         Please be sure to review the configuration prior
         to building and using your toolchain!
Now, you have been warned!

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Now configured for "arm-pocketbook-linux-gnueabi"
  IN    config.gen/arch.in
  IN    config.gen/kernel.in
  IN    config.gen/cc.in
  IN    config.gen/binutils.in
  IN    config.gen/libc.in
  CONF  config/config.in
make: *** No rule to make target 'upgradeconfig'.  Stop.
The command '/bin/sh -c ./build_pb_tc.sh' returned a non-zero code: 2
make: *** [Makefile:6: build] Error 2