Startup hang following Manjaro update

[Phil Hudson]

I've just updated Manjaro and stumpwm no longer starts for me. This is
what gets written to my log file:

---------

; compiling file
"/home/phil/quicklisp/dists/quicklisp/software/stumpwm-20220707-git/ioloop.lisp"
(written 21 JUL 2022 09:22:13 AM):
;
; caught ERROR:
;   READ error during COMPILE-FILE:
;
;     Symbol "UNIX-SELECT" not found in the SB-UNIX package.
;
;       Line: 273, Column: 43, File-Position: 13683
;
;       Stream: #<SB-INT:FORM-TRACKING-STREAM for "file
/home/phil/quicklisp/dists/quicklisp/software/stumpw
m-20220707-git/ioloop.lisp" {1004175B83}>

; compilation aborted after 0:00:00.006
ASDF could not load stumpwm because
COMPILE-FILE-ERROR while compiling #<CL-SOURCE-FILE "stumpwm" "ioloop">.
While evaluating the form starting at line 1, column 0
  of #P"/home/phil/bin/stumpwm-utils/startstump.lisp":

debugger invoked on a UIOP/LISP-BUILD:COMPILE-FILE-ERROR in thread
#<THREAD "main thread" RUNNING {10048F01B3}>:
  COMPILE-FILE-ERROR while compiling #<CL-SOURCE-FILE "stumpwm" "ioloop">

------------

I have no clue what to do.