Add Doxygen::Filter::Perl to prerequisites scripts

install_prerequisites.cmd

 @echo off
 
+:: The first iteration of this script used local::lib to compile and
+:: install all packages into the local subdirectory defined in variable
+:: 'libdir'. This has not worked out and therefore it is not used
+:: anymore and everything related is documented but commented out below.
+
 :: This is the ugliest code I was ever forced to create, sorry.
 :: It first evaluates the output of perl -Mlocal::lib=--deactivate-all
 :: to reset related environment variables.
 :: Then it tries to install the perl packages listed in the variable
 :: 'string' below via CPAN.
-::
 
-:: For XS packages (using C modules underneath) also a Visual Studio
-:: SDK needs to be installed *and set up for command line usage*. The
-:: latter requires setting up various environment variables (PATH, LIB,
-:: INCLUDE) correctly to make the the build environment accessible.
+
+:: For XS packages (using C modules underneath) a Visual Studio SDK
+:: needs to be installed *and set up for command line usage*. The latter
+:: requires setting up various environment variables (PATH, LIB, INCLUDE)
+:: correctly to make the the build environment accessible.
 :: There is in theory a batch file that does that temporarily but its
 :: path is not constant between VS versions...
 
@@ -31,18 +36,15 @@ Scalar::Util ^
 Config::Simple ^
 Time::HiRes ^
 Digest::CRC ^
+Doxygen::Filter::Perl ^
 Win32::SerialPort
 :: Unix version of the latter: Device::SerialPort
 
+
 ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
 :: No need to look further... and I pity you if you do. ::
 ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
 
-:: The first iteration of this script used local::lib to compile and
-:: install all packages into the local subdirectory defined in variable
-:: 'libdir'. This has not worked out and therefore it is not used
-:: anymore and everything related is commented out below.
-
 :: set libdir=extlib
 
 :: set f=oreaiptresao.bat

install_prerequisites.sh

-#!/bin/bash -e
+#!/bin/sh -e
 
 # Install all required packages from CPAN (root rights via sudo required).
 #
@@ -20,6 +20,7 @@ Config::Simple
 Time::HiRes
 Digest::CRC
 Device::SerialPort
+Doxygen::Filter::Perl
 END
 )