adaptation to the new build system + fixes

scripts/version.py

@@ -32,10 +32,10 @@ class GitVersion:
 
         branch_num = self._exec_git("rev-list --count HEAD") or "n/a"
 
-        try:
-            version = self._exec_git("describe --tags --abbrev=0 --exact-match")
-        except subprocess.CalledProcessError:
-            version = "unknown"
+        version = (
+            os.environ.get("DIST_SUFFIX", None)
+            or "unknown"
+        )
 
         return {
             "GIT_COMMIT": commit,