It seems app-office/sc (spreadsheet calculator) was last updated upstream about 20 years ago. At this point it's safe to say the project is no longer in development.
There is a currently maintained fork called sc-im (spreadsheet calculator - improved) which has been in continuous development for about 6 years at this point. It does not exist in the main Gentoo repository but app-office/sc-im is present in GURU. The app-office/sc-im ebuild appears to be maintained by someone named Dex Conner. I'm new at this, but it looks to me like the ebuild is in good shape. The only thing that jumps out at me is the fact that the package manifest needs some TLC. My thought is unless some serious deficiency is present in app-office/sc-im it should be moved to Gentoo's main ebuild repository and the last rites process should be started for app-office/sc. Does anyone else have thoughts or comments on this? Jeff Gazso