[Help-tar] Changing the tar build process

[Rasmus Storjohann]

Hi

I'm making a modified version of tar. I have added the following files:

tar/lib/foo.c
tar/lib/foo.h
tar/src/bar.h
tar/src/bar.c

as well as modifying existing tar source files. foo.h is #included in 
src/create.c and src/bar.c, and bar.h is #included in src/create.c as well.

What I would like is: lib/foo.c should be compiled into lib/foo.o; 
lib/foo.o should be included in lib/libtar.a; src/bar.c should be 
compiled into src/bar.o; src/bar.o should be included in the linking 
step to create src/tar.

I can do this manually and I get a working tar binary, but how can I get 
the tar build system to do this? I've tried to play with configure.ac, 
lib/Makefile.am and src/Makefile.am but my additional files are ignored.

Also, how to I get the build system to include an additional library 
-lbaz in the step to link src/tar.

It would seem to me that these changes should not be terribly 
complicated to implement, but I'm stuck. Any pointers are appreciated.

Thanks
Rasmus