Apt-get :: "apt-get install make" error

hi, nice linux distro
i have some problems with dsl though..


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root@box:/home/damnsmall# apt-get install make
Reading Package Lists... Done
Building Dependency Tree... Done
The following extra packages will be installed:
 fileutils
The following NEW packages will be installed:
 fileutils make
0 upgraded, 2 newly installed, 0 to remove and 1 not upgraded.
Need to get 1097kB of archives.
After unpacking 2773kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://ftp.us.debian.org stable/main fileutils 4.1-10 [710kB]
Get:2 http://ftp.us.debian.org stable/main make 3.79.1-14 [386kB]
Fetched 1097kB in 6s (182kB/s)                                                                                                                    
Selecting previously deselected package fileutils.
(Reading database ... 10753 files and directories currently installed.)
Unpacking fileutils (from .../fileutils_4.1-10_i386.deb) ...
dpkg: error processing /var/cache/apt/archives/fileutils_4.1-10_i386.deb (--unpack):
trying to overwrite `/bin/chgrp', which is also in package coreutils
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
/var/cache/apt/archives/fileutils_4.1-10_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
root@box:/home/damnsmall#
====================

my goal was to install mplayer, i've configured my apt sourcelist to check there: deb http://marillat.free.fr/ unstable main
to get the latest, but now i have few problems:

- how to get "apt-get install mplayer-nogui " to satisfy dependencies?
- if i decide to get mplayer's source, i can't compile nothing, the developpment tools aren't installed...

someone could list me the packages i will need to install normal dev environment? like being able to do a ./configure
make
make install ...

and for apt, how can i tell apt-get to auto satisfy the deps?

thanks