unable to install librecad in wheezy amd64

[Tad Bak <T.Bak@uws.edu.au>]

Hi,

The subject says all: after issuing the command:

apt-get install librecad

I am getting: 
[...]
The following packages have unmet dependencies:
 librecad : Depends: libqt4-help (>= 4:4.5.3) but it is not going to be installed
            Depends: libqt4-qt3support (>= 4:4.5.3) but it is not going to be installed
            Depends: libqt4-sql (>= 4:4.5.3) but it is not going to be installed
            Depends: libqt4-sql-sqlite but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

Where should I look to fix this? Thanks for your help!

Tad