Building application problem: custom Makefile

[s_buschmann@xxxxxx (Stefan Buschmann)]

Just a quick guess. I usually don't work with Makefiles directly, so I 
may be wrong:
In your Makefile, 'all' depends on 'voip-app.c', for which no rule is 
given. Shouldn't it be
  all: void-app
rather than
  all: void-app.c
instead?

Stefan