C:\Lokale_Daten\XML-Edifact-0.47>perl makefile.pl

I know I should check for those 99 possible places, but I prefer to ask :-)

XML::Edifact will produce XML files that need a place for their document
type definitions. The default points to my site, and store its files
to a temporary directory. If you change them, part of the regession test
will fail, so at best just press return.

Anyway, do not provide a trailing slash, File::Spec will do that!

URL for public documents [http://www.xml-edifact.org]
Directory on this system [C:\Temp\xml-edifact] c:\lokale_daten\

Checking if your kit is complete...
Looks good

Error: Unable to locate installed Perl libraries or Perl source code.

It is recommended that you install perl in a standard location before
building extensions. Some precompiled versions of perl do not contain
these header files, so you cannot build extensions. In such a case,
please build and install your perl from a fresh perl distribution. It
usually solves this kind of problem.

(You get this message, because MakeMaker could not find "\az-guinan\Applications\Perl\lib\CORE\perl.h")