fxruby | extension module for Ruby that provides an interface

It looks like the following should solve your problem (see this reference):

According to the docs here's how you would use the method, but first you'll need to install and require the gem

The warning about the path you can safely ignore (at least for now). What the error is telling you is that you do not have the FOX development headers and libraries installed, so it couldn't build the fxruby gem. So you must install the fox development package - it may be named something like "fox16" or "fox16-devel", or something else depending on what version of Linux you're running. (If all else fails, you can build it yourself).

After that, compiling fxruby (using gem install fxruby) should work.

If you do want to build FOX yourself, here are (approximately) the steps:

1) Go to the FOX website http://www.fox-toolkit.org/ , and download the latest 1.6 (stable) version (at the moment, fox-1.6.57.tar.gz).

2) I would create a directory ~/src, then cd ~/src, and unpack the downloaded package, e.g., tar xvf ~/Downloads/fox-1.6.57.tar.gz (adjust the path according to wherever you have actually downloaded the package).

2) You should now have a subdirectory fox-1.6.57 (i.e., ~/src/fox-1.6.57/). Cd to it, and read top-level documentation in README and INSTALL.

3) Run the configure script, ./configure or ./configure --prefix=$HOME. The difference between these invocations is that if you run a plain ./configure, the software will be installed under the default location /usr/local (this will require root access when installed), whereas the invocation ./configure --prefix=$HOME will result in the software being installed under $HOME. The latter will not require root access to install and probably is better if you're just installing the software for your own use.

4) I you are installing under your own home directory, create appropriate subdirectories: cd ~; mkdir bin include lib'. (The installation may take care of this, but it doesn't hurt to pre-create the directories.)

5) Now run make. That should compile and build the FOX libraries under the local directory (~/src/fox-1.6.57/)

6) Run make install. That will install the libraries under either the default location of /usr/local or your home directory ~ (depending on your configure option)

7) A this point, you should have the FOX libraries and headers installed. Now try gem install fxruby. (If you're going for a local install, probably gem install fxruby --user-install.)

You need to learn about layout parameters. Try this modification of your Test class and I think you will know where to go from there: