This[1] is already merged so I don't understand your point.

-- 
Денис В. Шеломовский...

...but it did build on my machine.

[1] https://github.com/DigitalMars/optlink/pull/2

...is in optdll.mak and should be:

OPTLINK: $(DIRS)
	cd ..\OS2LINK
	$(DM)\bin\link $(OBJ...

Dear Walter Bright,
could you please test Optlink to be buildable not only with your...

It's there now.

...but even with
https://github.com/DigitalMars/optlink/pull/5
there are still make errors...

...DigitalMars/optlink/pull/4


So, everything works now!
No, it's a joke. )))
Optlink is...

If someone wants to do a pull req to remove the dependence on scio.h...

Sorry, accidentally Ctrl+Enter sent the main post malformed. The last link is a proof...

...build Optlink.
2. C++ compiler is not open-source.
3. You can not build Optlink...