on use of SUBDIR vs. just adding path to _SOURCES variable...

[cs]

If source directory has some subdirectories, we
can just add SUBDIRS line to Makefile.am and then take care of /that/
(sub)directory with *another* Makefile.am /in that subdirectory/.

What would the Makefile.am look like for the *subdirectory*????

There would be no executable there.
Therefore, there would not be a bin_PROGRAMS line right?  Because there
is no bin_PROGRAMS line, it is not clear what xxx_SOURCES line sets
the "xxx" equal to....

So Makefile.am for subdir of source is possibly *just* a xxx_SOURCES line???

Chris