RE: "No rule to make target" in a BUILT_SOURCES, non-recursive, multi-directory project

[Daily, Jeff A]

> Weird.  I cannot reproduce your issue with that make version on
> GNU/Linux.
> 
> Which file system does this happen on, maybe a case-insensitive one and
> there is another file in the source or the build tree matching the name
> (or parts of the dirname) case-insensitively?

Great tip!  I forgot this particular system is case-insensitive.  I had the 
files wapi.py, wapi.c, and wapi.h.  I renamed wapi.py to wapigen.py and it now 
works for the VPATH build.  Nice.

> On this system, does the build succeed if you don't use a VPATH, i.e.,
> in-tree ./configure && make?

Yep, it always worked without VPATH.