Fix portability problem in toplevel Makefile

* Makefile.in (sanity-check, preferred-branch-is-current): Avoid
POSIX command substitution, to make Makefile work with the SVR4
shell.

diff --git a/Makefile.in b/Makefile.in
index 0b7c9680fe5e2119c018664617c16bdffc2a3fd3..729cd4140e541d23544c27940cd16d6e78745846 100644 (file)
--- a/Makefile.in
+++ b/Makefile.in
@@ -417,9 +417,9 @@ advice-on-failure:
 
 sanity-check:
        @[ -f .no-advice-on-failure ] && exit 0; true
-       @v=$$(src/emacs${EXEEXT} --batch --eval \
+       @v=`src/emacs${EXEEXT} --batch --eval \
          '(progn (defun f (n) (if (= 0 n) 1 (* n (f (- n 1))))) (princ (f 10)))' \
-         2> /dev/null); \
+         2> /dev/null`; \
        [ "X$$v" = "X3628800" ] && exit 0; \
        echo >&2 '***'; \
        echo >&2 '*** '"\"make ${make-target}\" succeeded, but Emacs is not functional."; \
@@ -1287,7 +1287,7 @@ PREFERRED_BRANCH = emacs-28
 preferred-branch-is-current:
        git branch | grep -q '^\* $(PREFERRED_BRANCH)$$'
 unchanged-history-files:
-       x=$$(git diff-files --name-only $(CHANGELOG_N) $(emacslog)) && \
+       x=`git diff-files --name-only $(CHANGELOG_N) $(emacslog)` && \
          test -z "$$x"
 
 # Regular expression that matches the newest commit covered by a ChangeLog.