setuptools-scm's raison d'être is to extract the version from a .git/.hg subdirectory, which is incompatible with reproducible builds as those directories are not reproducible in the slightest, and is hence usually removed. It does, however, let you override the version with a hardcoded value too, albeit it's implementation thereof is rather poor.

Ergo, setuptools-scm sans the “scm” gives you an over-engineered package that mutates a singular variable: one that releases much too frequently, and of—to put it mildly—questionable quality; this stub's purpose is simply to reduce the maintenance burden on packagers who have to deal with setuptools-scm for zero reason.

How?

Simply install this package to the virtual environment in question, set the SETUPTOOLS_SCM_PRETEND_VERSION environment variable to the version you want to use during the build, and it should just work. This package does, however, assume that you're using a single virtual environment to build a single package, as it does not support setting the hardcoded version for a specific named package.