It looks you have a source version. First make sure you have gcc and g++ installed (you can just run the commands from terminal and see if you get something different from 'command not found'. If that's the first program you have in that form, there's a big chance you need to install the programs. Just use your Mandrake tools and install all packages with name beginning with gcc and g++.
When it's done you need to unpack the file in a safe location (may be somewhere in your home dir). The commands:
tar xjvf kconstruct-stable.tar.bz2
A new directory (konstruct, probably) will be created. Then move to the new directory:
(change the name if it's diffeent in your case)
Then compile the program:
warning: to run the last command successfully you need to be root). So in fact it should be
(type your root password)
You should now have Konstruct installed.
You may get error during the 'configure' stage. Read the messages carefully. It'll probably say that you don't have a library installed (giving you its name). If something like that happens, run the Mandrake tool to install packages, see if you have that library. The error is caused by you not having a libraryname-devel package. Install it and run configure again. Of course, if you don't have the library itself, install it with the devel package.