There are just better and more accurate ways to emulate psx games, mess/mame will probably never be one of those and there are many problems with mame such as compiling it which is tedious. The beetle-psx-libretro core is currently the best way (No argument) to emulate psx games (Or pcsx-rearmed if you're using an arm device). It is ported from mednafen to the libretro API, but without mednafen's terrible non-functional frontend and with many additional features such as OpenGL rendering which is admittedly still immature. The software renderer is quite accurate though.
Don't use higan either, its maintainer (byuu) asked everyone's permission to make it public domain (Where some contributors clearly did not agree) and then instead decided to sell proprietary licenses to hyperkin who is well documented at violating free software licenses. Please don't support them. Anyways its future is gone as pretty much everyone who contributed to it have been alienated by byuu's antisocial antics and have moved onto greener pastures such as libretro.
http://www.libretro.com/index.php/re...se-violations/
http://www.libretro.com/index.php/hy...sing-problems/
https://byuu.org/emulation/higan/licensing
If you want to use bsnes you can still use bsnes-libretro, bsnes-mercury or beetle-bsnes-libretro. The first two allow using the balanced performance profile which no longer exists in upstream higan and may work better for some people. The accuracy profile is only really needed for a few games that aren't very good.
https://slackbuilds.org/repository/1...snes-libretro/
https://slackbuilds.org/repository/1...bsnes-mercury/
https://slackbuilds.org/repository/1...snes-libretro/
Most emulators are just best run with retroarch/libretro. They have put a lot of work into the libetro API and into their frontend which shows greatly. This allows emulating almost all useful retro emulators (~50 are available at SBo) while having a fully functional frontend and no required dependencies that are not included in a full Slackware install. Additionally the upcoming 1.3.7 release should have many improvements over the 1.3.6 release in SBo. Give it a try.
If you want to try a more up to date version of the RetroArch or the libretro cores you can use my slackbuilds which will clone from the git masters, however do not expect them to always be stable.
https://notabug.org/orbea/SlackBuild...ames/RetroArch
https://notabug.org/orbea/SlackBuild...games/libretro