
`cmake @3.16.3` is the version provided by Ubuntu 20.04. Adding this version here avoids the warning ``` ==> Warning: Missing a source id for cmake@3.16.3 ``` when using the system `cmake`.
`cmake @3.16.3` is the version provided by Ubuntu 20.04. Adding this version here avoids the warning ``` ==> Warning: Missing a source id for cmake@3.16.3 ``` when using the system `cmake`.