> I also would prefer filter by target name, but this is more complicated
> since the target name might be different than the directory name.

That problem is handled by `libsrc/Makefile`, starting at line 121.
The patch will be done to lines 176 and 180.  They can be changed to:

* `ifneq (,${filter $(TARGET),$(MKINC)})`
* `ifneq (,${filter $(TARGET),$(TARGETUTIL)})`

The include lines below them still will point to the proper paths.