require subr-x

init.el

@@ -6,7 +6,7 @@
 ;; threshold to temporarily prevent it from running, then reset it later by
 ;; enabling `gcmh-mode'. Not resetting it will cause stuttering/freezes.
 (setq gc-cons-threshold most-positive-fixnum)
-
+(require 'subr-x) ;; (string-strim) etc
 (eval-when-compile
   ;; no-load-path.el must be found in `load-path`. Fortunately this is
   ;; only needed at compile time.