Help needed: Building for RTEMS #925

I'm trying to build the OSAL for RTEMS and it seems like there's a piece of the cmake system that isn't part of the repo I've checked out. Here's the steps I've taken:

git clone https://github.com/nasa/osal.git

I've created an osal/cmake/toolchain-rtems.cmake file with information about my RTEMS setup.

I run cmake -DOSAL_SYSTEM_BSPTYPE=generic-rtems -DCMAKE_TOOLCHAIN_FILE=cmake/toolchain-rtems.cmake .. and I get the following.

-- BSP Selection: generic-rtems at //home/jeff/osal/src/bsp/generic-rtems
CMake Error at src/bsp/generic-rtems/CMakeLists.txt:81 (generate_config_includefile):
  Unknown CMake command "generate_config_includefile".


-- Configuring incomplete, errors occurred!
See also "//home/jeff/osal/build/CMakeFiles/CMakeOutput.log".
See also "//home/jeff/osal/build/CMakeFiles/CMakeError.log".

looking in the nasa/cFS repo I see generate_config_includefile defined in cFE/cmake/global_functions.cmake

Am I misconfiguring something that us causing generate_config_includefile to be called when it shouldn't be?

I'm building on a linux machinee.

Thanks for any help!