h2xs problem handling nested include file(s)

[Bloodnok]

Greeting fellow monastarians ,

Using v5.12.4 perl on Ubuntu 11.10, I seem to have run into problem(s) using h2xs on a header file including it's own nested header file(s) - whereby the attempt always fails to #include the nested file :

h2xs -Oxan IBM::Notes  IBM/Notes/acl
Defaulting to backwards compatibility with perl 5.12.4
If you intend this module to be compatible with earlier perl versions,
+ please
specify a minimum perl version with the -b option.

Overwriting existing IBM-Notes!!!
Writing IBM-Notes/ppport.h
Scanning typemaps...
 Scanning /usr/share/perl/5.12/ExtUtils/typemap
Scanning IBM/Notes/acl.h for functions...
In file included from <stdin>:1:0:
IBM/Notes/acl.h:24:20: fatal error: global.h: No such file or director
+y
compilation terminated.
In file included from <stdin>:1:0:
IBM/Notes/acl.h:24:20: fatal error: global.h: No such file or director
+y
compilation terminated.
Scanning IBM/Notes/acl.h for typedefs...
Writing IBM-Notes/lib/IBM/Notes.pm
Writing IBM-Notes/Notes.xs
Writing IBM-Notes/fallback/const-c.inc
Writing IBM-Notes/fallback/const-xs.inc
Writing IBM-Notes/Makefile.PL
Writing IBM-Notes/README
Writing IBM-Notes/t/IBM-Notes.t
Writing IBM-Notes/Changes
Writing IBM-Notes/MANIFEST

I've tried the following, all without any success ....

• Modifying Makefile.PL to add the path to the included file to the INC definition UPDATE: (in retrospect, this was nugative effort in as much as h2xs re-writes MAKEFILE.pl anyway)
• Using the '-F' flag to specify the extra '-I' flag to the compiler

In the interests of completeness, I have tried googling for the/any answer/help, but also to no avail, so any & all suggestions/advice gratefully received.

TIA & best rgds to all ,