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Re: Newbie can't get gcc to find include files


From: Noel Yap
Subject: Re: Newbie can't get gcc to find include files
Date: Mon, 8 Jul 2002 03:50:00 -0700 (PDT)

--- Gamaliel <address@hidden> wrote:
> gcc is not finding an include file that is present
> when I use Cygwin
> and a bash shell.  I have written a simple hello
> world program to
> illustrate the problem.
> ===================================
> #include <stdio.h>
> #include </usr/X11R6/include/Xm/Xm.h>
> 
> void main()
> {
>   printf "Hello World!\n";
> }
> ===================================
> 
> I compile the program as follows
> 
> gcc hello.c -o hello -lXm
> 
> I then get error messages such as
> 
> /usr/X11R6/include/Xm/Xm.h:32: X11/Intrinsic.h: No
> such file or
> directory.
> 
> Intrinsic.h is included in Xm.h as follows
> 
> #include <X11/Intrinsic.h>
> 
> When I look for Intrinsic.h in
> /usr/X11R6/include/Xm/X11 it is
> present.

I believe you'll need to pass in a -I flag to tell gcc
where to find X11/Intrinsic.h.

You wouldn't need to do this if the line were:
#include "X11/Intrinsic.h"

> The files are specified to be in my path in the
> .profile directory.
> 
> PATH="/usr/X11R6/include/Xm/X11:$PATH"
> export PATH

Unlike Windows, PATH is used solely for executables. 
Even in Windows, I think PATH isn't used for include
files.

> So why doesn't gcc know that it is present?

1. Learn the difference between #include <> and
#include "".
2. Learn about the -I flag to gcc.

HTH,
Noel


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