apt-get -f install

Finally said 'f**k it' to myself and ran apt-get -f install:

# apt-get -f install
Reading Package Lists... Done
Building Dependency Tree... Done
Correcting dependencies... Done
The following packages will be REMOVED:
  smbclient
0 upgraded, 0 newly installed, 1 to remove and 71 not upgraded.
Need to get 0B of archives.
After unpacking 9081kB disk space will be freed.
Do you want to continue? [Y/n] Y
(Reading database ... 10125 files and directories currently installed.)
Removing smbclient ...

Is it likely that I'll miss smbclient? Does the stock firmware use it for anything? Seems unlikely that the nas would need to connect to another smb-server...

Also, apt-get still won't work:

# apt-get update && apt-get install build-essential
Hit http://archive.debian.org sarge/main Packages
Hit http://www.readynas.com readynas/ Packages
Hit http://www.readynas.com readynas/ Release
Hit http://archive.debian.org sarge/main Release
Hit http://archive.debian.org sarge/contrib Packages
Hit http://archive.debian.org sarge/contrib Release
Hit http://archive.debian.org sarge/non-free Packages
Hit http://archive.debian.org sarge/non-free Release
Hit http://archive.debian.org sarge/main Sources
Hit http://archive.debian.org sarge/main Release
Hit http://archive.debian.org sarge/contrib Sources
Hit http://archive.debian.org sarge/contrib Release
Hit http://archive.debian.org sarge/non-free Sources
Hit http://archive.debian.org sarge/non-free Release
Reading Package Lists... Done
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:
  build-essential: Depends: libc6-dev-sparc64 but it is not going to be installed
                   Depends: dpkg-dev (>= 1.4.1.19) but it is not going to be installed
E: Broken packages