If it is a JAR file you want to add, goto Projects -> Properties ->
Java Build Path and select "Add External JARs".

You did not specify if this is a java source and or class file. There
are at least three two ways to do what you want to do.

First
- put your target file into a jar file.
- Right click on your Eclipse project and select "Properties"
- Select "Java Build Path"
- Select "Add External Jar" and add that jar file you created
- Your project now has access.

Second
- Select main menu Windows\Preferences\Java\Build Path\Classpath Variables
- Add a path to your external code
- then you can add to your projects

Third
- Create a project in Eclipse for you external code.
- House it here
- Any other project that wants to reference this code the do the
following:
- Right click on your Eclipse project sand select "Properties"
- Select Project references
- Select the project you just created do that

Thanks in Advance...
IchBin, Pocono Lake, Pa, USA
http://weconsultants.servebeer.com/JHackerAppManager
__________________________________________________________________________

'If there is one, Knowledge is the "Fountain of Youth"'
-William E. Taylor,  Regular Guy (1952-)

   Two others have given you some answers. Note that "#INCLUDE" in C is a
preprocessor directive, and is part of the preprocessor language. It's
independent of any IDE. That is, the #INCLUDE directive should function the
same way whether you're using Notepad, Emacs, vi, or anything else.

   The way you've phrased your question makes it sound like you're asking
about how to do something specifically within Eclipse, which is why the
others have given the answers they did. If they answered the "wrong"
question, you should probably clarify this inconsistency above.

   - Oliver