removing a package from apt-get?

[j2]

Ok, i tried to install a .deb with dpkg -i filename.deb and ran into a problem that i was lacking flex. So i did "apt-get install flex" and then i get   cookiemonster:/root/Download/SMS/gnokii-0.5.2# apt-get install flex Reading Package Lists... Done Building Dependency Tree... Done You might want to run `apt-get -f install' to correct these: Sorry, but the following packages have unmet dependencies:   gnokii-smsd: Depends: libc6 (>= 2.3.1-1) but 2.2.5-11.5 is to be installed                Depends: gnokii (= 0.5.0-1) but 0.3.5-1 is to be installed   gnokii-smsd-mysql: Depends: libc6 (>= 2.3.1-1) but 2.2.5-11.5 is to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). cookiemonster:/root/Download/SMS/gnokii-0.5.2#   Now, how can i tell apt-get that i no longer wish to install those packages ( i will build them from source instead), but how to remove the gnokii-components from the list of files to be installed?