Document which versions of ActivePerl and ActiveTcl are required

for building on MSVC, and that the free distribution is enough
(no need for the enterprise version).

Per gripe from Martin Zaun.

doc/src/sgml/install-win32.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/install-win32.sgml,v 1.47 2008/03/14 17:28:23 alvherre Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/install-win32.sgml,v 1.48 2008/07/29 15:17:27 mha Exp $ -->
 
 <chapter id="install-win32">
  <title>Installation on <productname>Windows</productname></title>
@@ -83,14 +83,16 @@
       ActiveState Perl is required to run the build generation scripts. MinGW
       or Cygwin Perl will not work. It must also be present in the PATH.
       Binaries can be downloaded from
-      <ulink url="http://www.activestate.com"></>.
+      <ulink url="http://www.activestate.com"></> (Note: version 5.8 is required,
+      the free Standard Distribution is sufficient).
      </para></listitem>
     </varlistentry>
 
     <varlistentry>
      <term><productname>ActiveState TCL</productname></term>
      <listitem><para>
-      Required for building <application>PL/TCL</application>.
+      Required for building <application>PL/TCL</application> (Note: version
+      8.4 is required, the free Standard Distribution is sufficient).
      </para></listitem>
     </varlistentry>