Making a release tag - acl2/acl2 GitHub Wiki
Here is how Rager created a tag for 8.3:
cd <any acl2 clone>
git checkout 4f18d3bb3fd89b45f1789f4f13c39f4db2551c28
git tag -a 8.3 -m "ACL2 Version 8.3 release tag"
Check my work
git tag
Push result
git push origin 8.3
Here is how Rager created a tag for v7.2:
cd <clean acl2 clone>
Checkout the checksum associated with the release
git checkout a12f619371efea2a64684d0432f1eff6b1afb7ef
build it and make sure the experimental note isn't there
<make acl2>; bash; ACL2_CUSTOMIZATION=NONE ./ccl-saved_acl2
git tag -a v7.2 -m "ACL2 Version 7.2 release tag"
check my work
git show v7.2
git push origin v7.2