Hope its not to late to post...
Was looking for the same thing. There is a bug report on kde's bugzilla: http://bugs.kde.org/show_bug.cgi?id=92566
to include support for Intel Fortran Compiler v8.1 to KDevelop v3.1.1.
Fortran is not really supported by KDevelop, much because of modules wich need to be compiled before other files.
To be able to use kdevelop with that compiler, you need to:
1. Create your own Makefile for you project.
2. Go to "Project" menu, then "Import existing project"
3. Enter the full path to the project, give it a name, and for the "Project type" choose "A Fortran program (personal makefile)"
Now if you build the project it will only execute "make -k". You can also construct files independly from the "Construct -> Construct target" menu. I think that the menu will check your makefile for options.
If you want to be able to click in the output window to get to the line containing the error, you will have to patch KDevelop and recompile it. I've created a patch for kdevelop v3.2.1 witch is posted in the bug report.
Hope it helped and good luck!