Depend on files in other directories (Automake)

    Hi all.

I know this is slightly off-topic, but while I am trying to
make the sources of btparse to use automake and libtool, I ran
into the following problem:

btparse includes a test suite, whose programs depend on the
shared library itself. Therefore, when using automake and
libtool, this shared library needs to be added to LDADD:

  ## Process this file with automake to produce Makefile.in
  
  INCLUDES = @INCLUDES@ -I../src
  LDADD = ../src/libbtparse.la
  
  bin_PROGRAMS = simple_test read_test postprocess_test
  
  simple_test_SOURCES = simple_test.c testlib.c
  
  read_test_SOURCES = read_test.c testlib.c
  
  postprocess_test_SOURCES = postprocess_test.c

However, when I run make, I get an error (note that in the
toplevel Makefile, SUBDIRS = tests src):

  marco@wimsey:~/devel/debian/btparse-0.33mk % make    
  Making all in tests
  make[1]: Entering directory /usr/local/debian/btparse-0.33mk/tests'
  gcc -DHAVE_CONFIG_H -I. -I.  -I../src    -g -O2 -c simple_test.c
  gcc -DHAVE_CONFIG_H -I. -I.  -I../src    -g -O2 -c testlib.c
  make[1]: *** Keine Regel vorhanden, um das Target »../src/libbtparse.la«,
    benötigt von »simple_test«, zu erstellen.  Schluss.
  make[1]: Leaving directory /usr/local/debian/btparse-0.33mk/tests'
  make: *** [all-recursive] Fehler 1

(Which means, for the non-German-speaking among you, that make
has no rule to create ../src/libbtparse.la.)

How do I specify that the contents of the src directory (in
which libbtparse.la will eventually be generated) should be
built before trying to build test? Can I only do this by
putting SUBDIRS in the right order (i.e., putting src before
tests)?

    Marco

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