What to do when the tools I am supposed to compare my work with are no longer maintained and functional? Recently I got a review asking me to compare my work with a few more works in the same domain. Now in my work, I developed a tool, and have made it publicly available. I have been asked by the reviewers to compare my tool with a few other tools available. While trying to compare I found none of the tools are maintained publicly. I have mailed them for the codes of these tools but no one replied. The executables are also not available. I mailed them for these executables only. But no one replied. What should I do?

Note: There were 2 reviewers. One said either compare properly or remove this section totally, other asked me to compare the works. Apart from this comment, all other comments have been addressed.
I see a few ways on handling that:


write to the editor that the tools are unavailable and let him decide what to do with your paper.
add a passage in your comparison section stating that due to unavailability of those tools the comparison was not carried out.
ok, the authors don't reply. But if the reviewers want the comparison that probably means that at least someone is still using the tools in question. Maybe you can get in touch with some other laboratory that has the executables and run the necessary tests on-site there?