Add a --with-compiler switch that allows someone to specify:

	--with-compiler=xlc

Requested by: Darren King <aixssd!darrenk@abs.net>

src/configure.in

@@ -228,11 +228,19 @@ else
 fi
 echo ""
 
+dnl We use the default value of 5432 for the DEF_PGPORT value.  If
+dnl we over-ride it with --with-pgport=port then we bypass this piece
+if test "X$with_compiler" != "X"
+then
+        CC=$with_compiler
+else
+        AC_PROG_CC
+fi
+
 
 AC_CONFIG_HEADER(include/config.h)
 
 dnl Checks for programs.
-AC_PROG_CC
 AC_PROG_CPP
 
 AC_LINK_FILES(include/port/${PORTNAME}.h, include/os.h)