linker error dev c++

i am encountering a Linker Error: Undefined reference in my program under DEV c++
it involves usage of the NTL class of header files.
i have downloaded those files and have every header file existing in the required forlder of NTL.
but still there are issues concerning the reference.
i have tried including that folder at every possible location of BIN, include, LIB. the folder is also included within tht folder where my program is stationed. yet there are reference errors cropping up.
[Linker error] undefined reference to `NTL::ZZ_p::ZZ_p()'
[Linker error] undefined reference to `NTL::sub(NTL::ZZ&, NTL::ZZ const&, long)'


there are around 230 of these errors and all asoosciated with NTL class only.
can somebody plz suggest wat is going wrong.

Project->settings->linker->additional libraries

Add the path to where the NTL library is
Add the name of the NTL library

you may also need to check enable the projects for the executable project's "project dependencies" (wow that's a lot of project words)

...EDIT: nm, didn't realize u're using dev-c++. what i posted is for VS.