add check for libz compression library for pg_dump

configure.in

@@ -689,6 +689,7 @@ AC_PROG_YACC
 AC_SUBST(YFLAGS)
 
 
+AC_CHECK_LIB(z,     main)
 AC_CHECK_LIB(sfio,     main)
 AC_CHECK_LIB(ncurses,  main, [], [AC_CHECK_LIB(curses, main)])
 AC_CHECK_LIB(termcap,  main)

src/include/config.h.in

@@ -8,7 +8,7 @@
  * or in config.h afterwards.  Of course, if you edit config.h, then your
  * changes will be overwritten the next time you run configure.
  *
- * $Id: config.h.in,v 1.122 2000/07/02 15:21:18 petere Exp $
+ * $Id: config.h.in,v 1.123 2000/07/05 17:44:29 scrappy Exp $
  */
 
 #ifndef CONFIG_H
@@ -511,6 +511,9 @@ extern long random(void);
 extern void srandom(unsigned int seed);
 #endif
 
+/* Set to 1 if you have libz.a */
+#undef HAVE_LIBZ
+
 /* Set to 1 if you have libreadline.a */
 #undef HAVE_LIBREADLINE