Do not built the chaco subdirectory _at all_. Rationale:

The anonymous CVS in Heidelberg does not contain this directory
for legal and historical reasons.  The Stuttgart svn does contain
it, however the diff tool (apparently) does not include the 
content of missing directories into patch files.  Hence a clean
checkout from Heidelberg with patches from Stuttgart will still
not contain chaco, and every reference to it from the build
system is an error.

[[Imported from SVN: r8326]]

configure.ac

@@ -239,7 +239,6 @@ AC_CONFIG_FILES([Makefile
                  parallel/ppif/MPI/Makefile
 		 parallel/ddd/Makefile
 		 parallel/dddif/Makefile
-		 parallel/chaco/Makefile
                  libug.pc
 ])
 AC_OUTPUT
@@ -253,6 +252,10 @@ dnl                  gm/gg3/netgen/geom/makefile
 dnl                  gm/gg3/netgen/linalg/makefile
 dnl                  gm/gg3/netgen/meshing/makefile
 dnl                  gm/gg3/netgen/opti/makefile
+# The chaco stuff is not built because it is not available
+# in the anonymous Heidelberg CVS and not in the set of patches
+# we provide either.  AFAIK it doesn't work anyways.
+dnl                  parallel/chaco/Makefile
 dnl                  parallel/chaco/assign/Makefile
 dnl                  parallel/chaco/bpmatch/Makefile
 dnl                  parallel/chaco/coarsen/Makefile

parallel/Makefile.am

 # $Id$
 
-SUBDIRS = dddif ddd util ppif chaco
+# Build the following subdirectories.  The chaco subdir
+# is not built because it is not available in the anonymous
+# Heidelberg CVS and not in the set of patches we provide
+# either.  AFAIK it doesn't work anyways.
+SUBDIRS = dddif ddd util ppif #chaco
 
 if PARALLEL
   PLIB = libparallel2.la libparallel3.la