Another round of those unportable config/build changes :-/

* Add option to build with OpenSSL out of the box. Fix thusly exposed
  bit rot. Although it compiles now, getting this to do something
  useful is left as an exercise.

* Fix Kerberos options to defer checking for required libraries until
  all the other libraries are checked for.

* Change default odbcinst.ini and krb5.srvtab path to PREFIX/etc.

* Install work around for Autoconf's install-sh relative path anomaly.
  Get rid of old INSTL_*_OPTS variables, now that we don't need them
  anymore.

* Use `gunzip -c' instead of g?zcat. Reportedly broke on AIX.

* Look for only one of readline.h or readline/readline.h, not both.

* Make check for PS_STRINGS cacheable. Don't test for the header files
  separately.

* Disable fcntl(F_SETLK) test on Linux.

* Substitute the standard GCC warnings set into CFLAGS in configure,
  don't add it on in Makefile.global.

* Sweep through contrib tree to teach makefiles standard semantics.

... and in completely unrelated news:

* Make postmaster.opts arbitrary options-aware. I still think we need to
  save the environment as well.

src/backend/libpq/Makefile

@@ -4,11 +4,12 @@
 #    Makefile for libpq subsystem (backend half of libpq interface)
 #
 # IDENTIFICATION
-#    $Header: /cvsroot/pgsql/src/backend/libpq/Makefile,v 1.21 2000/07/08 03:04:39 tgl Exp $
+#    $Header: /cvsroot/pgsql/src/backend/libpq/Makefile,v 1.22 2000/07/09 13:14:05 petere Exp $
 #
 #-------------------------------------------------------------------------
 
-SRCDIR = ../..
+subdir = src/backend/libpq
+top_builddir = ../..
 include ../../Makefile.global
 
 # be-fsstubs is here for historical reasons, probably belongs elsewhere
@@ -17,6 +18,12 @@ OBJS = be-fsstubs.o \
 	auth.o crypt.o hba.o password.o \
 	pqcomm.o pqformat.o pqpacket.o pqsignal.o util.o
 
+# This location might depend on the installation directories. Therefore
+# we can't subsitute it into config.h.
+ifdef krb_srvtab
+CPPFLAGS += -DPG_KRB_SRVTAB='"$(krb_srvtab)"'
+endif
+
 
 all: SUBSYS.o