master a5d142e8301 1/2: Fix portability problem in toplevel Makefile

[Po Lu]

branch: master
commit a5d142e8301c3dfb193e89eda9caf50ee2a92d28
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    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.
---
 Makefile.in | 6 +++---
 1 file 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.