Installing the Qt SDK to d:\NokiaQtSDK or d:\maemo\NokiaQtSDK instead of the default c:\NokiaQtSDK caused compilation errors related to perl.

Before installing the Qt Mobility 1.0RC sdk, I had the beta version, which worked well.
The beta version was installed to D:\maemo\NokiaQtSDK

I did the following in order to upgrade to the new 1.0RC :
1. Uninstalled everything.
2. Reboot
3. Downlaoded the offline 900MB installer.
4. Installed with custom mode (selecting ALL components) to D:\maemo\NokiaQtSDK

When I tried to compile something directly to my N900 over wifi with Mad Developer, I got the following error :

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Running build steps for project HelloWorld...
Starting: "d:/nokiaqtsdk/maemo/4.6.2/targets/fremantle-pr12/bin/qmake.exe" C:/Maemo/Projects/HelloWorld/HelloWorld/HelloWorld.pro -r -spec default -unix
The process "d:/nokiaqtsdk/maemo/4.6.2/targets/fremantle-pr12/bin/qmake.exe" exited normally.
Starting: "D:/nokiaqtsdk/maemo/4.6.2/bin/make.exe" -w
make: Entering directory `/c/Maemo/Projects/HelloWorld/HelloWorld-build'
make: Nothing to be done for `first'.
make: Leaving directory `/c/Maemo/Projects/HelloWorld/HelloWorld-build'
The process "D:/nokiaqtsdk/maemo/4.6.2/bin/make.exe" exited normally.
Creating package file ...
Package Creation: Running command 'dh_installdirs'.
Packaging Error: Command 'dh_installdirs' failed. Output was: Can't locate Debian/Debhelper/Dh_Lib.pm in @INC (@INC contains: d \nokiaqtsdk\maemo\4.6.2\madlib/perl5 /usr/lib/perl5/5.6/msys /usr/lib/perl5/5.6 /usr/lib/perl5/site_perl/5.6/msys /usr/lib/perl5/site_perl/5.6 /usr/lib/perl5/site_perl/5.6/msys /usr/lib/perl5/site_perl/5.6 /usr/lib/perl5/vendor_perl/5.6/msys /usr/lib/perl5/vendor_perl/5.6 /usr/lib/perl5/vendor_perl/5.6/msys /usr/lib/perl5/vendor_perl/5.6 .) at d:/nokiaqtsdk/maemo/4.6.2/madbin/dh_installdirs line 10. BEGIN failed--compilation aborted at d:/nokiaqtsdk/maemo/4.6.2/madbin/dh_installdirs line 10.
Error while building project HelloWorld (target: Maemo)
When executing build step ''
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I tried using perl PUSH @INC to add the path of module, it worked, but then I had another error.
I then uninstalled everything and installed again to d:\nokiaqtsdk, it didn't help,
as last resort someone at talk.maemo.org suggested I try to install the whole thing to C:\nokiaqtsdk - This Worked.