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

Makefile.pre.in

@@ -914,6 +914,10 @@ $(DESTSHARED):
 #  $(PYTHON) -> python2 -> python$(VERSION))
 # Also create equivalent chains for other installed files
 bininstall:	altbininstall
+	-if test ! -d $(DESTDIR)$(LIBPC); then \
+		echo "Creating directory $(LIBPC)"; \
+		$(INSTALL) -d -m $(DIRMODE) $(DESTDIR)$(LIBPC); \
+	fi
 	-if test -f $(DESTDIR)$(BINDIR)/$(PYTHON) -o -h $(DESTDIR)$(BINDIR)/$(PYTHON); \
 	then rm -f $(DESTDIR)$(BINDIR)/$(PYTHON); \
 	else true; \

Misc/NEWS

@@ -56,6 +56,8 @@ Tests
 Build
 -----
 
+- Issue #25696: Fix installation of Python on UNIX with make -j9.
+
 - Issue #25798: Update OS X 10.5+ 32-bit-only installer to build
   and link with OpenSSL 1.0.2e.