I have ported SRFI-1 to gambit and put it in its own "srfi1#" namespace. It was pretty trivial to do. I think this might be of interest to other people so I figured I would offer it the community.
For those interested, I have also ported Yasos to gambit. The main thing I did was convert the hygienic macros to un-hygienic macros so that it wouldn't depend on syntax-case.scm and error line numbers would be a little more accurate. In the future I intend to extend it with method-missing and perform functionality.
Neither of these are extremely well tested at this point. I am in the process of finding and porting a unit test framework but I have not finished yet. Once I do I will add unit tests for the above two to the package.
It may be that someone else has already made these available for gambit, if so just ignore this and I apologize for the noise.