* lisp/Makefile.in (check-defun-dups): Avoid POSIX command
substitutions.
## This finds a lot of duplicates between foo.el and obsolete/foo.el.
check-defun-dups:
sed -n -e '/^(defun /s/\(.\)(.*/\1/p' \
- $$(find . -name '*.el' ! -name '.*' -print | \
- grep -Ev '(loaddefs|ldefs-boot)\.el|obsolete') | sort | uniq -d
+ `find . -name '*.el' ! -name '.*' -print | \
+ grep -Ev '(loaddefs|ldefs-boot)\.el|obsolete'` | sort | uniq -d
# Dependencies