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Linux/LINUXSDK-AM35X: bitbake-layers command broken

Part Number: LINUXSDK-AM35X

Tool/software: Linux

I have built the latest SDK from source per the website instructions, and I am able to successfully build the arago-base-tisdk-image.  However, as a next step I wish to customize my image, and as part of that process I have tried to use the bitbake-layers command, but I get the following errors:

~/tisdk/build$ bitbake-layers show-layers

OTE: Starting bitbake server...
ERROR: Unable to start bitbake server
ERROR: Last 10 lines of server log for this session (/home/nextmove/tisdk/build/bitbake-cookerdaemon.log):
    self.databuilder.parseBaseConfiguration()
  File "/home/nextmove/tisdk/sources/bitbake/lib/bb/cookerdata.py", line 316, in parseBaseConfiguration
    raise bb.BBHandledException
bb.BBHandledException
ERROR: Failed to obtain external Linaro toolchain version: Execution of '/opt/gcc-linaro-7.2.1-ti2018.00-armv5-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-gcc -v' failed: command not found
ERROR: Failed to obtain external Linaro toolchain version: Execution of '/opt/gcc-linaro-7.2.1-ti2018.00-armv5-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-gcc -v' failed: command not found
ERROR: Failed to obtain external Linaro toolchain version: Execution of '/opt/gcc-linaro-7.2.1-ti2018.00-armv5-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-gcc -v' failed: command not found
ERROR: Failed to obtain external Linaro toolchain version: Execution of '/opt/gcc-linaro-7.2.1-ti2018.00-armv5-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-gcc -v' failed: command not found
ERROR: Error: EXTERNAL_TOOLCHAIN path '/opt/gcc-linaro-7.2.1-ti2018.00-armv5-x86_64_arm-linux-gnueabi' does not exist
ERROR: Error: EXTERNAL_TOOLCHAIN path '/opt/gcc-linaro-7.2.1-ti2018.00-armv5-x86_64_arm-linux-gnueabi' does not exist

ERROR: Unable to start bitbake server
ERROR: Last 10 lines of server log for this session (/home/nextmove/tisdk/build/bitbake-cookerdaemon.log):
    self.databuilder.parseBaseConfiguration()
  File "/home/nextmove/tisdk/sources/bitbake/lib/bb/cookerdata.py", line 316, in parseBaseConfiguration
    raise bb.BBHandledException
bb.BBHandledException
ERROR: Failed to obtain external Linaro toolchain version: Execution of '/opt/gcc-linaro-7.2.1-ti2018.00-armv5-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-gcc -v' failed: command not found
ERROR: Failed to obtain external Linaro toolchain version: Execution of '/opt/gcc-linaro-7.2.1-ti2018.00-armv5-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-gcc -v' failed: command not found
ERROR: Failed to obtain external Linaro toolchain version: Execution of '/opt/gcc-linaro-7.2.1-ti2018.00-armv5-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-gcc -v' failed: command not found
ERROR: Failed to obtain external Linaro toolchain version: Execution of '/opt/gcc-linaro-7.2.1-ti2018.00-armv5-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-gcc -v' failed: command not found
ERROR: Error: EXTERNAL_TOOLCHAIN path '/opt/gcc-linaro-7.2.1-ti2018.00-armv5-x86_64_arm-linux-gnueabi' does not exist
ERROR: Error: EXTERNAL_TOOLCHAIN path '/opt/gcc-linaro-7.2.1-ti2018.00-armv5-x86_64_arm-linux-gnueabi' does not exist

The processor SDK website instructs the user to get the linaro toolchain with the following command:

wget https://releases.linaro.org/components/toolchain/binaries/7.2-2017.11/arm-linux-gnueabihf/gcc-linaro-7.2.1-2017.11-x86_64_arm-linux-gnueabihf.tar.xz

I don't even see the missing toolchain available on the Linaro site.