It's my first program in GCC with X Windows.

I compiled my code with this:
gcc HelloWorld.c -o HelloWorld -lXm -lXt -lX11

same as the original poster used.

I got the same error.
/usr/bin/ld: cannot find -lXm
collect2: ld returned 1 exit status

So I compiled it with the path from:
locate libXdm
which is:
/usr/X11R6/lib/libXdmcp.a

So I compiled the code with:
gcc HelloWorld.c -o HelloWorld -l/usr/X11R6/lib/libXdmcp.a -lXm -lXt -lX11

but the same error occured:
/usr/bin/ld: cannot find -l/usr/X11R6/lib/libXdmcp.a
collect2: ld returned 1 exit status

Then I saw some codes in the net and how to compile them so:
gcc HelloWorld.c -o HelloWorld -L/usr/X11R6/lib/libXdmcp.a -lXm -lXt -lX11

But then it goes back to:
/usr/bin/ld: cannot find -lXm
collect2: ld returned 1 exit status

What am I doing wrong? I'm using Fedora Core 3. I searched for the Xm, Xt and X11 folder in my computer using whereis. I did get the paths except for Xt but when I compile the problem started with Xm not Xt. The Xm and X11 folders do contain some files.

Please help.

*Cheers

Did you actually try the hints I gave the other guy ?

I can't seen any -L/usr/X11R6/lib in your modified command...
Only an (doomed) attempt with a file where a path is required.

Cheers,
Tink

ah... the PATH... okies... thx...