Mac SIP prevents manpages being installed

Makefile

@@ -208,8 +208,8 @@ install:
 	install -m 0755 -d $(DESTDIR)$(prefix)/bin/
 	install -m 0755 tilemaker $(DESTDIR)$(prefix)/bin/
 	install -m 0755 tilemaker-server $(DESTDIR)$(prefix)/bin/
-	install -m 0755 -d ${DESTDIR}${MANPREFIX}/man1/
-	install docs/man/tilemaker.1 ${DESTDIR}${MANPREFIX}/man1/
+	@install -m 0755 -d ${DESTDIR}${MANPREFIX}/man1/ || true
+	@install docs/man/tilemaker.1 ${DESTDIR}${MANPREFIX}/man1/ || true
 
 clean:
 	rm -f tilemaker tilemaker-server src/*.o src/external/*.o include/*.o include/*.pb.h server/*.o test/*.o

docs/INSTALL.md

@@ -11,6 +11,8 @@ Then:
     make
     sudo make install
 
+(System Integrity Protection on macOS prevents the manpages being installed. This isn't important: ignore the two lines saying "Operation not permitted".)
+
 ### Ubuntu
 
 Start with:
@@ -22,7 +24,7 @@ Once you've installed those, then `cd` back to your Tilemaker directory and simp
     make
     sudo make install
 
-If it fails, check that the LIB and INC lines in the Makefile correspond with your system, then try again.
+If it fails, check that the LIB and INC lines in the Makefile correspond with your system, then try again. The above lines install Lua 5.1, but you can also choose any newer version.
 
 ### Fedora