update links

Author: jmckenna

en/installation/unix.txt

@@ -13,7 +13,7 @@
 :Contact: thomas.bonfort at gmail.com
 :Author: Jeff McKenna
 :Contact: jmckenna at gatewaygeomatics.com
-:Last Updated: 2022-08-15
+:Last Updated: 2025-04-14
 
 .. contents:: Table of Contents
     :depth: 2
@@ -593,7 +593,7 @@ with MapServer.
 .. _`libxml`: http://xmlsoft.org
 .. _`Oracle Spatial OCI`: https://www.oracle.com/ca-en/database/technologies/instant-client/downloads.html
 .. _`libpq`: https://www.postgresql.org/
-.. _`giflib`: http://giflib.sourceforge.net/
+.. _`giflib`: https://giflib.sourceforge.net/
 .. _`FastCGI`: https://fastcgi-archives.github.io/
 .. _`Cairo (SVG, PDF) support`: https://www.cairographics.org/
 .. _`Cairo SVG parser support`: https://mapserver.org/development/rfc/ms-rfc-73.html

en/installation/win32.txt

@@ -113,12 +113,12 @@ packaged as ZIP, or as UNIX TAR and GZIP files.  You'll need a software that
 can unzip these packages. `7-Zip`_ is an example of software that can handle
 these files. 
 
-.. _`7-Zip`: http://www.7-zip.org/
+.. _`7-Zip`: https://www.7-zip.org/
 
 Cygwin is a free, open-source software package which is a port of these tools 
 on Windows. You can use the gzip and tar utilities from this tool collection.
 Cygwin is available from 
-http://www.cygwin.com.
+https://www.cygwin.com.
 
 In order to compile the MapServer CGI program, you must download a few 
 required and optional libraries. At its simplest configuration, MapServer 
@@ -144,7 +144,7 @@ snaphot is substantially easier than working directly from :ref:`git`.
 **Required Libraries**
 ----------------------
 
-.. _`GD Library`: http://www.libgd.org/
+.. _`GD Library`: https://libgd.github.io/
 
 `GD Library`_:
    MapServer uses the GD graphics library for rendering map images in GIF, PNG
@@ -163,19 +163,19 @@ Regex:
 Optional Libraries
 ------------------
 
-.. _`JPEG Library`: http://www.ijg.org/
+.. _`JPEG Library`: https://www.ijg.org/
 
 `JPEG library`_: 
    This library is required by GD to render JPEG images, if building GD from
    source.  You may download this library at
    http://www.ijg.org/files/jpegsrc.v6b.tar.gz
 
-.. _`PNG library`: http://www.libpng.org/pub/png/
+.. _`PNG library`: https://sourceforge.net/projects/libpng/
 
 `PNG library`_:
    This library is required by GD to render PNG images, if building GD from
    source.  You may download this library at 
-   http://sourceforge.net/projects/libpng/
+   https://sourceforge.net/projects/libpng/
 
 .. _`Zlib`:  https://zlib.net/
 
@@ -184,12 +184,12 @@ Optional Libraries
    compression support.  It can be downloaded at 
    https://zlib.net/ .
 
-.. _`FreeType 2`: http://www.freetype.org/
+.. _`FreeType 2`: https://www.freetype.org/
 
 `FreeType 2`_:
    FreeType provides TrueType support in MapServer via GD.  We only need to
    build FreeType separately if building GD from source.  It can be downloaded
-   at http://gnuwin32.sourceforge.net/packages/freetype.htm .
+   at https://gnuwin32.sourceforge.net/packages/freetype.htm .
 
 
 .. _`PROJ`: https://proj.org
@@ -206,7 +206,7 @@ Optional Libraries
     raster formats (GDAL) and vector formats (OGR).  It can be downloaded at
     https://gdal.org/.
 
-.. _`ArcSDE`: http://www.esri.com/software/arcgis/arcsde/
+.. _`ArcSDE`: https://en.wikipedia.org/wiki/ArcSDE
 
 `ArcSDE`_: 
     ArcSDE is an ESRI proprietary spatial database engine.  Most users will not