--- ispell.el.orig	2015-04-02 10:23:06.000000000 +0300
+++ ispell.el	2016-09-14 22:36:58.446548500 +0300
@@ -3044,7 +3044,17 @@
 	       ispell-program-name
 	       (or ispell-local-dictionary ispell-dictionary "default"))
       (sit-for 0)
-      (setq ispell-library-directory (ispell-check-version)
+      (setq
+        ;; Why do we need to update `ispell-library-directory' on every 
+        ;; ispell process launch? If we do not change `ispell-program-name', 
+        ;; then `ispell-library-directory' should also not be changed once 
+        ;; it is set/initialized in `ispell-set-spellchecker-params'.
+        ;; Besides, this breaks custom setting `ispell-library-directory' 
+        ;; (e.g. cygwin ispell with LIBDIR relative to cygwin root, that 
+        ;; should be fixed; custom location of dictionaries), because it 
+        ;; resets `ispell-library-directory' to (possibly incorrect, 
+        ;; unwanted) ispell LIBDIR on every ispell call.
+        ;; ispell-library-directory (ispell-check-version) 
 	    ispell-process (ispell-start-process)
 	    ispell-filter nil
 	    ispell-filter-continue nil