I am not sure it is possible to install the IDL project from the IDE. One way to do this is to go to the IDL project directory and run:
$ ./reconf
$ ./configure
$ make
$ make install
Note: If the user does not have write permission to the $OSSIEHOME directory, the install command will have to be run as root:
$ sudo make install
This will build and install your IDLs and IDL libraries into $OSSIEHOME. Once that has been done, the IDE should find your new IDL and allow you to add ports to a component or device with this IDL. Since REDHAWK doesn't know anything specific about your IDL the code generation obviously will only be stubs.