[ubuntu] libx11, libx11-dev

I am brand new to this and the program i am trying to install says i need libx11, libx11-dev & zlib, zlib-dev. I am showing that they are installed in the application manager but when installing the program i get this

/usr/bin/ld: cannot find -lX11
/usr/bin/ld: cannot find -lz

Is this something that must be done via command line?
Thanks in advance.
-clueless