edit:
this is the error that is shown in xterm

BusyBox v1.10.2 (Debian 3:1.10.2.legal-1osso26+0m5) built-in shell (ash)
Enter 'help' for a list of built-in commands.

~ $ sudo gainroot
Root shell enabled


BusyBox v1.10.2 (Debian 3:1.10.2.legal-1osso26+0m5) built-in shell (ash)
Enter 'help' for a list of built-in commands.

/home/user # apt-get install libqt4-maemo5-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
libqt4-maemo5-dev: Depends: libgles2-sgx-img-dev but it is not installable
Depends: opengles-sgx-img-common-dev but it is not installable
Depends: libsqlite3-dev but it is not installable
E: Broken packages
/home/user #

i used rootsh to get root access. but if i did it right i dont know. iam a noob in this section ^^