$NetBSD$

--- Makefile.orig	2020-01-24 22:02:03.000000000 +0000
+++ Makefile
@@ -48,7 +48,7 @@
 # !! FIND_SKIP_DIRS section of dev/doc/build-system.dev.txt         !!
 # "-not -name ." to avoid skipping everything since we "find ."
 # "-type d" to be able to find .merlin.in files
-FIND_SKIP_DIRS:=-not -name . '(' \
+FIND_SKIP_DIRS:=! -name . '(' \
   -name '{arch}' -o \
   -name '.*' -type d -o \
   -name '_darcs' -o \
