DEBUGGER=gdb steam
STEAM_RUNTIME is disabled automatically on arch
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Reading symbols from /home/xpander/.local/share/Steam/ubuntu12_32/steam...(no debugging symbols found)...done.
(gdb) quit

[xpander@arch ~]$ export STEAM_RUNTIME=1
[xpander@arch ~]$ DEBUGGER=gdb steam
STEAM_RUNTIME is enabled by the user
/home/xpander/.local/share/Steam/steam.sh: line 403: 31002 Segmentation fault      (core dumped) $STEAM_DEBUGGER -x "$ARGSFILE" "$STEAMROOT/$PLATFORM/$STEAMEXE" "$@"
/home/xpander/.local/share/Steam/steam.sh: line 403: 31004 Segmentation fault      (core dumped) rm "$ARGSFILE"