Compiling OpenGL code with GCC
Chris Fisichella
research at microcalorimetry.com
Sat Jan 31 21:54:52 PST 2004
Hi,
I am using FreeBSD 4.4 with GCC 2.95. I am trying to get a simple OpenGL
program to compile. I think I am having linking issues.
The problem is this error I get from the compiler:
undefined reference to 'glXQueryExtension'
Now, I call that function in my code. I found the prototype for it in
/usr/X11R6/include/GL/glx.h.
On the compiler line, I specify
-I/usr/X11R6/include
and (I think) the compiler can then resolve the
#define <GL/glx.h>
statement I have in my source code and, hence find the include file.
Additionally, the book I am reading has me specify the following libraries:
-lGL -lXext -lX11
I added the library directory flag:
-L/usr/X11R6/lib
where I find libGL.a, libXext.a and libX11.a are located.
Well, I kept getting that error. So, I tried renaming the compiler libraries
on the command line:
-llibGL -llibXext -lX11
and tried other permutations to try to get this code to link. But, it won't
and I am stuck. If any one out there has some insight into this, I would
appreciate some help.
Thanks very much,
Chris
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