[QUESTION] Unknown CMake command "GET_VERSION_TAG"?

[meltingscales]

# Question

I'm trying to dockerize this app so that it's easier to install.

I'm compiling from master, the latest commit.

See https://github.com/meltingscales/ARRCON/blob/feature-docker/Dockerfile

I have a question about C++ compilation - What does it mean when I see the error below and how might I fix it?

melty@ubuntu-slimdragon:~/Git/ARRCON$ docker build ./
[+] Building 0.7s (10/12)                                        docker:default
 => [internal] load build definition from Dockerfile                       0.0s
 => => transferring dockerfile: 485B                                       0.0s
 => [internal] load metadata for docker.io/library/ubuntu:22.04            0.3s
 => [internal] load .dockerignore                                          0.0s
 => => transferring context: 2B                                            0.0s
 => [1/8] FROM docker.io/library/ubuntu:22.04@sha256:67cadaff1dca187079fc  0.0s
 => [internal] load build context                                          0.0s
 => => transferring context: 20.40kB                                       0.0s
 => CACHED [2/8] RUN apt update                                            0.0s
 => CACHED [3/8] RUN apt-get install -y gcc-10 cmake ninja-build           0.0s
 => [4/8] ADD . /app                                                       0.1s
 => [5/8] WORKDIR /app                                                     0.0s
 => ERROR [6/8] RUN cmake -B build -DCMAKE_BUILD_TYPE=Release -G Ninja     0.2s
------                                                                          
 > [6/8] RUN cmake -B build -DCMAKE_BUILD_TYPE=Release -G Ninja:                
0.159 CMake Error at CMakeLists.txt:6 (include):                                
0.159   include could not find requested file:
0.159 
0.159     VersionTag
0.159 
0.159 
0.159 CMake Error at CMakeLists.txt:9 (GET_VERSION_TAG):
0.159   Unknown CMake command "GET_VERSION_TAG".
0.159 
0.159 
0.159 -- Configuring incomplete, errors occurred!
------
Dockerfile:16
--------------------
  14 |     ENV CC=gcc-10
  15 |     ENV CXX=g++-10
  16 | >>> RUN cmake -B build -DCMAKE_BUILD_TYPE=Release -G Ninja
  17 |     RUN cmake --build build --config Release
  18 |     
--------------------
ERROR: failed to solve: process "/bin/sh -c cmake -B build -DCMAKE_BUILD_TYPE=Release -G Ninja" did not complete successfully: exit code: 1

[radj307]

You're missing a CMake library included in 307lib
Make sure you get all the submodules when you clone the repository with --recurse-submodules

Should be something like git clone https://github.com/radj307/ARRCON --recurse-submodules.