Bug#408639: qt4-doc: error when compiling qt4 demos

[Giuseppe D'Angelo <dangelo@cli.di.unipi.it>]

Package: qt4-doc
Version: 4.2.1-2
Severity: important

Hi. When I try to compile the qt4 demos
(from /usr/share/doc/qt4-doc/qt4-demos.tar.gz) I get:

[...]
make[1]: Entering directory `/home/peppe/qt4-demos/demos/arthurplugin'
make -f Makefile.Release
make[2]: Entering directory `/home/peppe/qt4-demos/demos/arthurplugin'
mkdir: impossibile creare la directory `/plugins': Permission denied
make[2]: *** [/plugins/designer/libarthurplugin.so] Error 1
make[2]: Leaving directory `/home/peppe/qt4-demos/demos/arthurplugin'
make[1]: *** [release] Error 2
make[1]: Leaving directory `/home/peppe/qt4-demos/demos/arthurplugin'
make: *** [sub-arthurplugin-make_default] Error 2

I don't know if that's just a typo, but this is blocking proper 
compilation of the demos. In the .pro file I see:

DESTDIR     = $$QT_BUILD_TREE/plugins/designer

and in Makefile.Release:

$(MKDIR) /plugins/designer/

Perhaps $$QT_BUILD_TREE is undefined?

Cheers,
Giuseppe D'Angelo

-- System Information:
Debian Release: 4.0
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/dash
Kernel: Linux 2.6.19-1-686
Locale: LANG=it_IT@euro, LC_CTYPE=it_IT@euro (charmap=ISO-8859-15)

-- no debconf information