* doc/automake.texi (Top level): Rename as ... (Directories): ... this, and split into ... (Subdirectories, Conditional Subdirectories): ... these. (Conditional Subdirectories): Describe SUBDIRS and DIST_SUBDIRS before the example. Append a discussion about non-configured conditional directories. (Alternative): Move as a child of Directories. (Subpackages): New section. (Dist): Adjust links to Subdirectories, a Subpackages. (Third-Party Makefiles): Link to Conditional Subdirectories.