Black Mesa no longer opens under the RadeonSI Mesa stack

I am on Manjaro linux, Kernel 4.9.22, Mesa 17.0.3-1. Whever I try to start bms.sh this is what happens

manjaro-pc Black Mesa]$ ./bms.sh libGL libGL error: unable to load driver: radeonsi_dri.so libGL error: driver pointer missing libGL error: failed to load driver: radeonsi libGL error: unable to load driver: radeonsi_dri.so libGL error: driver pointer missing libGL error: failed to load driver: radeonsi libGL error: unable to load driver: swrast_dri.so libGL error: failed to load driver: swrast X Error of failed request: BadValue (integer parameter out of range for operation) Major opcode of failed request: 155 (GLX) Minor opcode of failed request: 3 (X_GLXCreateContext) Value in failed request: 0x0 Serial number of failed request: 102 Current serial number in output stream: 103

If there is any other information I can give to help you solve this let me know, Thanks.

I figured it out. I had to delete /Black Mesa/bin/libstdc++.so.6 Crowbar pls fix.

Same issue. Blog post about it and finding the problem:
https://thomasvanderberg.nl/blog/fixing-black-mesa-linux/

tldr: If Black Mesa on Steam doesn’t start, and the log says something about missing radeon drivers (like libGL error: unable to load driver: radeonsi_dri.so and some extra text), remove libstdc++.so.6 in your “~/.steam/steam/steamapps/common/Black Mesa/bin/”. It should start normally now. Below is how I found out and fixed it for myself.

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.