Earlier fix forgot to include the mconfig file, meaning that DESTDIR/MANDIR were not defined unless set on build command line.
@@ -1,3 +1,5 @@
+include ../../mconfig
+
install:
mkdir -p "$(DESTDIR)$(MANDIR)/man8"
install dinit.8 dinitctl.8 "$(DESTDIR)$(MANDIR)/man8"