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POopengl on ubuntu linux - Linker error: undefined references
 

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  1. POopengl on ubuntu linux - Linker error: undefined references
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    <p>I just want to start in openGL programming, so I installed freeglut3 from the repositories of ubuntu and I have all mesa packages installed, as well as build-essentials.</p> <p>Later, I copied one simple example of <a href="http://en.wikibooks.org/wiki/OpenGL_Programming/Modern_OpenGL_Introduction#Initialization" rel="nofollow noreferrer">openGL wiki</a> <br/> In first, I tried to compile it with: <code>gcc triangle.c -o triangle.o</code>; <br/>but, later, I read here: <a href="https://stackoverflow.com/questions/17766420/linker-error-undefined-reference-to-symbol-glortho">Linker error : undefined reference to symbol &#39;glOrtho&#39;</a> that i have to linked the libraries with -l.<br/> So, I tried with <code>gcc triangle.c -lglut -lGL -Wall -o triangle.o</code></p> <p>Both return the same error:</p> <pre><code>/tmp/ccKLT4ac.o: In function `main': triangle.c:(.text+0x2b): undefined reference to `glutInit' triangle.c:(.text+0x37): undefined reference to `glutInitDisplayMode' triangle.c:(.text+0x4b): undefined reference to `glutInitWindowSize' triangle.c:(.text+0x57): undefined reference to `glutCreateWindow' triangle.c:(.text+0x5c): undefined reference to `glewInit' triangle.c:(.text+0x73): undefined reference to `glewGetErrorString' triangle.c:(.text+0xaa): undefined reference to `glutDisplayFunc' triangle.c:(.text+0xaf): undefined reference to `glutMainLoop' collect2: error: ld returned 1 exit status </code></pre> <p>I've tried to include gl.h &amp; glu.h libraries, try with a lot of different example programs in cpp,... and a lot of combinations. All return similar errors.</p> <p>ah, in /usr/include I have all the libraries:</p> <pre><code>akronix@ASJ-Netbook:~$ ls /usr/include/GL freeglut_ext.h glext.h glu_mangle.h glx.h glxproto.h freeglut.h gl.h glut.h glxint.h glxtokens.h freeglut_std.h gl_mangle.h glxew.h glx_mangle.h internal glew.h glu.h glxext.h glxmd.h wglew.h </code></pre>
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    1. USAkronix
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    1. COYou did not mention installing the glew package, nor do your linker directives include `-lGLEW`. Even after you resolve the glut issue, you will have problems with glew until you do this.
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      1. USAndon M. Coleman
    2. COTrue! thank you.
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      1. USAkronix
 

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