installations whose pg_config program does not appear first in the PATH.
Per gripe from Eddie Stanley and subsequent discussions with Fabien Coelho
and others.

to avoid useless multiple executions of pg_config.

tutorial to be used without necessarily having a configured source tree.

$Header: -> $PostgreSQL Changes ...

Eliminate the mysterious games that the Cygwin build plays with the linker
flag variables.  DLLLIBS is gone, use SHLIB_LINK like everyone else.
Detect cygipc in configure, after the linker flags are set up, otherwise
configure might not work at all.

Make sure everything is covered by make clean.

Fix the build of the new conversion procedure modules.

Add new DLLIMPORT markers where required.

Finally, the compiler complains if we use an explicit
-I/usr/local/include, so don't do that.  Curiously, -L/usr/local/lib is
still necessary.

source directory.  This involves mostly makefiles using $(srcdir) when they
might have used ".".  (Regression tests don't work with this, yet.)

Sort out usage of CPPFLAGS, CFLAGS (and CXXFLAGS).  Add "override" keyword
in most places, to preserve necessary flags even when the user overrode the
flags.

to one another. Sort out builddir vs srcdir variable namings. Remove some
now obsoleted make variables.

the src/include tree, so that -I backend is no longer necessary anywhere.
Also, clean up some bit rot in contrib tree.

1. Make 'all' works without complaint.  Don't have to add the .exp
   files to the files list.  They are made automagically when
   making the respective shared lib file.

   Only port that actually uses EXPSUFF (from makefiles/Makefile.*)
   is Aix, so if this breaks anybody else, let me know, asap.

2. Make 'clean' actually cleans up correctly.  Previously, it would
   leave the .o files in C-code directory.

3. Changed references to reflect new location of .c files.

4. Added DELETE statements to complex.source so that it tidies up
   when done.  Previously, it would leave things in pg_amop,
   pg_amproc and pg_opclass.  Only possible to do this with the
   new SUBSELECT code in 6.3.  Nice work, fellas...

   Not deleting the index entries would cause a non-fatal error if
   complex.sql was run again on the same database.  Much tidier now.

5. Corrected the README.  obj directory hasn't existed since Bryan
   redid the make way back when.  Also changed the snipet from psql
   to match the current version. POSTGRES95?!?  I don't think so. :)

Seem to remember someone posting to one of the lists a while back
that the tutorial code wouldn't compile and/or run.  Found four
problems with it that will let it run.

1. Tutorial makefile had a recursive use of DLOBJS.

2. Some tutorial needed semi-colons added to many statements.

3. Complex tutorial didn't clean up after itself.

4. Advanced had a time-travel example.  Commented it out and
   put a line pointing the user to contrib/spi/README.

From: Tom I Helbekkmo <tih@Hamartun.Priv.NO>