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.

1 files changed, 3 insertions, 3 deletions

diff --git a/Makefile.in b/Makefile.in
index 0b7c9680fe5..729cd4140e5 100644
--- 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.