Issue #25696: Fix installation of Python on UNIX with make -j9.

Makefile.pre.in

@@ -1110,6 +1110,10 @@ altbininstall: $(BUILDPYTHON) @FRAMEWORKPYTHONW@
 	fi
 
 bininstall: altbininstall
+	-if test ! -d $(DESTDIR)$(LIBPC); then \
+		echo "Creating directory $(LIBPC)"; \
+		$(INSTALL) -d -m $(DIRMODE) $(DESTDIR)$(LIBPC); \
+	fi
 	-if test -f $(DESTDIR)$(BINDIR)/python3$(EXE) -o -h $(DESTDIR)$(BINDIR)/python3$(EXE); \
 	then rm -f $(DESTDIR)$(BINDIR)/python3$(EXE); \
 	else true; \

Misc/NEWS

@@ -84,6 +84,8 @@ Tests
 Build
 -----
 
+- Issue #25696: Fix installation of Python on UNIX with make -j9.
+
 - Issue #25798: Update OS X 10.5 installer to use OpenSSL 1.0.2e.