ncurses-dev broken?

Please help with this!
I have a Readynas Ultra 2
I get the same error message,

ReadyNAS:/c/devel/linux-2.6.37.6# apt-get install libncurses5-dev
Reading package lists... Done
Building dependency tree... 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.

Since you only requested a single operation it is extremely likely that
the package is simply not installable and a bug report against
that package should be filed.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
  libncurses5-dev: Depends: ncurses-bin (= 5.7+20100313-5) but 5.5-5 is to be installed
E: Broken packages

Im following this guide http://www.readynas.com/forum/viewtopic.php?f=35&t=33132 , to install PPTP client.
But i cant run

make menuconfig

due to that package.
Or so it seems, I get this message when i try to run it

ReadyNAS:/c/devel/linux-2.6.37.6# make menuconfig
 *** Unable to find the ncurses libraries or the
 *** required header files.
 *** 'make menuconfig' requires the ncurses libraries.
 ***
 *** Install ncurses (ncurses-devel) and try again.
 ***
make[1]: *** [scripts/kconfig/dochecklxdialog] Error 1
make: *** [menuconfig] Error 2