title: (L)Ubuntu - Cannot find libGL.so but OpenGL works perfectly fine
body: <p>I'm trying to create an OpenGL program but I cannot link it because
  I always get the linker error that the libGL could not be found.
  I thought it is not installed, so i installed all the Mesa OpenGL stuff.
  libgl1-mesa-*
  mesa-*</p>
  
  <p>My driver is xserver-xorg-video-intel.
  All installed OpenGL software is prefectly running (linke Xmoto and Compitz).
  So I thought there might be a missing symlink. I searche the /usr/lib folder but found only libGLEW.so (no libGL.so).
  The headers are there. In /usr/include/GL</p>
  
  <p>Then I tried to ask pkg-config to get me the path to the OpenGL libs but it won't give any path, just the linker flag -lGL.
  And "pkg-config --libs-only-L gl" returns nothing.</p>
  
  <p>My glxinfo output is:</p>
  
  <pre><code>name of display: :0
  display: :0 screen: 0
  direct rendering: Yes
  server glx vendor string: SGI
  server glx version string: 1.4
  server glx extensions:
      GLX_ARB_multisample, GLX_EXT_import_context, GLX_EXT_texture_from_pixmap,
      GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_MESA_copy_sub_buffer,
      GLX_OML_swap_method, GLX_SGI_swap_control, GLX_SGIS_multisample,
      GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group,
      GLX_INTEL_swap_event
  client glx vendor string: Mesa Project and SGI
  client glx version string: 1.4
  client glx extensions:
      GLX_ARB_create_context, GLX_ARB_create_context_profile,
      GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context,
      GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_framebuffer_sRGB,
      GLX_EXT_create_context_es2_profile, GLX_MESA_copy_sub_buffer,
      GLX_MESA_multithread_makecurrent, GLX_MESA_swap_control,
      GLX_OML_swap_method, GLX_OML_sync_control, GLX_SGI_make_current_read,
      GLX_SGI_swap_control, GLX_SGI_video_sync, GLX_SGIS_multisample,
      GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group,
      GLX_EXT_texture_from_pixmap, GLX_INTEL_swap_event
  GLX version: 1.4
  GLX extensions:
      GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context,
      GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_MESA_copy_sub_buffer,
      GLX_MESA_multithread_makecurrent, GLX_MESA_swap_control,
      GLX_OML_swap_method, GLX_OML_sync_control, GLX_SGI_make_current_read,
      GLX_SGI_swap_control, GLX_SGI_video_sync, GLX_SGIS_multisample,
      GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group,
      GLX_EXT_texture_from_pixmap
  OpenGL vendor string: Tungsten Graphics, Inc
  OpenGL renderer string: Mesa DRI Intel(R) Ironlake Mobile
  OpenGL version string: 2.1 Mesa 8.0.2
  OpenGL shading language version string: 1.20
  OpenGL extensions:
      GL_ARB_multisample, GL_EXT_abgr, GL_EXT_bgra, GL_EXT_blend_color,
      GL_EXT_blend_minmax, GL_EXT_blend_subtract, GL_EXT_copy_texture,
      GL_EXT_polygon_offset, GL_EXT_subtexture, GL_EXT_texture_object,
      GL_EXT_vertex_array, GL_EXT_compiled_vertex_array, GL_EXT_texture,
      GL_EXT_texture3D, GL_IBM_rasterpos_clip, GL_ARB_point_parameters,
      GL_EXT_draw_range_elements, GL_EXT_packed_pixels, GL_EXT_point_parameters,
      GL_EXT_rescale_normal, GL_EXT_separate_specular_color,
      GL_EXT_texture_edge_clamp, GL_SGIS_generate_mipmap,
      GL_SGIS_texture_border_clamp, GL_SGIS_texture_edge_clamp,
      GL_SGIS_texture_lod, GL_ARB_framebuffer_sRGB, GL_ARB_multitexture,
      GL_EXT_framebuffer_sRGB, GL_IBM_multimode_draw_arrays,
      GL_IBM_texture_mirrored_repeat, GL_3DFX_texture_compression_FXT1,
      GL_ARB_texture_cube_map, GL_ARB_texture_env_add, GL_ARB_transpose_matrix,
      GL_EXT_blend_func_separate, GL_EXT_fog_coord, GL_EXT_multi_draw_arrays,
      GL_EXT_secondary_color, GL_EXT_texture_env_add,
      GL_EXT_texture_filter_anisotropic, GL_EXT_texture_lod_bias,
      GL_INGR_blend_func_separate, GL_NV_blend_square, GL_NV_light_max_exponent,
      GL_NV_texgen_reflection, GL_NV_texture_env_combine4,
      GL_SUN_multi_draw_arrays, GL_ARB_texture_border_clamp,
      GL_ARB_texture_compression, GL_EXT_framebuffer_object,
      GL_EXT_texture_env_combine, GL_EXT_texture_env_dot3, GL_MESA_window_pos,
      GL_NV_packed_depth_stencil, GL_NV_texture_rectangle, GL_NV_vertex_program,
      GL_ARB_depth_texture, GL_ARB_occlusion_query, GL_ARB_shadow,
      GL_ARB_texture_env_combine, GL_ARB_texture_env_crossbar,
      GL_ARB_texture_env_dot3, GL_ARB_texture_mirrored_repeat,
      GL_ARB_window_pos, GL_ATI_envmap_bumpmap, GL_EXT_stencil_two_side,
      GL_EXT_texture_cube_map, GL_NV_depth_clamp, GL_NV_vertex_program1_1,
      GL_APPLE_packed_pixels, GL_APPLE_vertex_array_object, GL_ARB_draw_buffers,
      GL_ARB_fragment_program, GL_ARB_fragment_shader, GL_ARB_shader_objects,
      GL_ARB_vertex_program, GL_ARB_vertex_shader, GL_ATI_draw_buffers,
      GL_ATI_texture_env_combine3, GL_ATI_texture_float, GL_EXT_shadow_funcs,
      GL_EXT_stencil_wrap, GL_MESA_pack_invert, GL_MESA_ycbcr_texture,
      GL_ARB_depth_clamp, GL_ARB_fragment_program_shadow,
      GL_ARB_half_float_pixel, GL_ARB_point_sprite, GL_ARB_shading_language_100,
      GL_ARB_sync, GL_ARB_texture_non_power_of_two, GL_ARB_vertex_buffer_object,
      GL_ATI_blend_equation_separate, GL_EXT_blend_equation_separate,
      GL_OES_read_format, GL_ARB_color_buffer_float, GL_ARB_pixel_buffer_object,
      GL_ARB_texture_compression_rgtc, GL_ARB_texture_float,
      GL_ARB_texture_rectangle, GL_EXT_packed_float, GL_EXT_pixel_buffer_object,
      GL_EXT_texture_compression_rgtc, GL_EXT_texture_rectangle,
      GL_EXT_texture_sRGB, GL_EXT_texture_shared_exponent,
      GL_ARB_framebuffer_object, GL_EXT_framebuffer_blit,
      GL_EXT_framebuffer_multisample, GL_EXT_packed_depth_stencil,
      GL_APPLE_object_purgeable, GL_ARB_vertex_array_object,
      GL_ATI_separate_stencil, GL_EXT_draw_buffers2,
      GL_EXT_gpu_program_parameters, GL_EXT_texture_array,
      GL_EXT_texture_integer, GL_EXT_texture_sRGB_decode, GL_EXT_timer_query,
      GL_OES_EGL_image, GL_MESA_texture_array, GL_ARB_copy_buffer,
      GL_ARB_depth_buffer_float, GL_ARB_half_float_vertex,
      GL_ARB_map_buffer_range, GL_ARB_texture_rg, GL_ARB_texture_swizzle,
      GL_ARB_vertex_array_bgra, GL_EXT_separate_shader_objects,
      GL_EXT_texture_swizzle, GL_EXT_vertex_array_bgra,
      GL_NV_conditional_render, GL_ARB_ES2_compatibility,
      GL_ARB_draw_elements_base_vertex, GL_ARB_explicit_attrib_location,
      GL_ARB_fragment_coord_conventions, GL_ARB_provoking_vertex,
      GL_ARB_sampler_objects, GL_ARB_seamless_cube_map,
      GL_ARB_shader_texture_lod, GL_EXT_provoking_vertex, GL_EXT_texture_snorm,
      GL_MESA_texture_signed_rgba, GL_ARB_robustness
  
  32 GLX Visuals
      visual x bf lv rg d st colorbuffer sr ax dp st accumbuffer ms cav
    id dep cl sp sz l ci b ro r g b a F gb bf th cl r g b a ns b eat
  ----------------------------------------------------------------------------
  0x021 24 tc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
  0x022 24 dc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
  0x08e 24 tc 0 24 0 r . . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
  0x08f 24 tc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
  0x090 24 tc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
  0x091 24 tc 0 24 0 r . . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
  0x092 24 tc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
  0x093 24 tc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
  0x094 24 tc 0 32 0 r . . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
  0x095 24 tc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
  0x096 24 tc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
  0x097 24 tc 0 32 0 r . . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
  0x098 24 tc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
  0x099 24 tc 0 24 0 r y . 8 8 8 0 . . 0 24 8 16 16 16 0 0 0 Slow
  0x09a 24 tc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
  0x09b 24 tc 0 32 0 r y . 8 8 8 8 . . 0 24 8 16 16 16 16 0 0 Slow
  0x09c 24 dc 0 24 0 r . . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
  0x09d 24 dc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
  0x09e 24 dc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
  0x09f 24 dc 0 24 0 r . . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
  0x0a0 24 dc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
  0x0a1 24 dc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
  0x0a2 24 dc 0 32 0 r . . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
  0x0a3 24 dc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
  0x0a4 24 dc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
  0x0a5 24 dc 0 32 0 r . . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
  0x0a6 24 dc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
  0x0a7 24 dc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
  0x0a8 24 dc 0 24 0 r y . 8 8 8 0 . . 0 24 8 16 16 16 0 0 0 Slow
  0x0a9 24 dc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
  0x0aa 24 dc 0 32 0 r y . 8 8 8 8 . . 0 24 8 16 16 16 16 0 0 Slow
  0x05d 32 tc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
  
  48 GLXFBConfigs:
      visual x bf lv rg d st colorbuffer sr ax dp st accumbuffer ms cav
    id dep cl sp sz l ci b ro r g b a F gb bf th cl r g b a ns b eat
  ----------------------------------------------------------------------------
  0x05e 0 tc 0 16 0 r . . 5 6 5 0 . . 0 0 0 0 0 0 0 0 0 None
  0x05f 0 tc 0 16 0 r y . 5 6 5 0 . . 0 0 0 0 0 0 0 0 0 None
  0x060 0 tc 0 16 0 r y . 5 6 5 0 . . 0 0 0 0 0 0 0 0 0 None
  0x061 0 tc 0 16 0 r . . 5 6 5 0 . . 0 16 0 0 0 0 0 0 0 None
  0x062 0 tc 0 16 0 r y . 5 6 5 0 . . 0 16 0 0 0 0 0 0 0 None
  0x063 0 tc 0 16 0 r y . 5 6 5 0 . . 0 16 0 0 0 0 0 0 0 None
  0x064 24 tc 0 24 0 r . . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
  0x065 24 tc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
  0x066 24 tc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
  0x067 24 tc 0 24 0 r . . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
  0x068 24 tc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
  0x069 24 tc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
  0x06a 24 tc 0 32 0 r . . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
  0x06b 24 tc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
  0x06c 24 tc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
  0x06d 24 tc 0 32 0 r . . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
  0x06e 24 tc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
  0x06f 32 tc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
  0x070 0 tc 0 16 0 r y . 5 6 5 0 . . 0 16 0 0 0 0 0 0 0 None
  0x071 0 tc 0 16 0 r y . 5 6 5 0 . . 0 16 0 16 16 16 0 0 0 Slow
  0x072 24 tc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
  0x073 24 tc 0 24 0 r y . 8 8 8 0 . . 0 24 8 16 16 16 0 0 0 Slow
  0x074 24 tc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
  0x075 24 tc 0 32 0 r y . 8 8 8 8 . . 0 24 8 16 16 16 16 0 0 Slow
  0x076 0 dc 0 16 0 r . . 5 6 5 0 . . 0 0 0 0 0 0 0 0 0 None
  0x077 0 dc 0 16 0 r y . 5 6 5 0 . . 0 0 0 0 0 0 0 0 0 None
  0x078 0 dc 0 16 0 r y . 5 6 5 0 . . 0 0 0 0 0 0 0 0 0 None
  0x079 0 dc 0 16 0 r . . 5 6 5 0 . . 0 16 0 0 0 0 0 0 0 None
  0x07a 0 dc 0 16 0 r y . 5 6 5 0 . . 0 16 0 0 0 0 0 0 0 None
  0x07b 0 dc 0 16 0 r y . 5 6 5 0 . . 0 16 0 0 0 0 0 0 0 None
  0x07c 24 dc 0 24 0 r . . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
  0x07d 24 dc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
  0x07e 24 dc 0 24 0 r y . 8 8 8 0 . . 0 0 0 0 0 0 0 0 0 None
  0x07f 24 dc 0 24 0 r . . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
  0x080 24 dc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
  0x081 24 dc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
  0x082 24 dc 0 32 0 r . . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
  0x083 24 dc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
  0x084 24 dc 0 32 0 r y . 8 8 8 8 . . 0 0 0 0 0 0 0 0 0 None
  0x085 24 dc 0 32 0 r . . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
  0x086 24 dc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
  0x087 24 dc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
  0x088 0 dc 0 16 0 r y . 5 6 5 0 . . 0 16 0 0 0 0 0 0 0 None
  0x089 0 dc 0 16 0 r y . 5 6 5 0 . . 0 16 0 16 16 16 0 0 0 Slow
  0x08a 24 dc 0 24 0 r y . 8 8 8 0 . . 0 24 8 0 0 0 0 0 0 None
  0x08b 24 dc 0 24 0 r y . 8 8 8 0 . . 0 24 8 16 16 16 0 0 0 Slow
  0x08c 24 dc 0 32 0 r y . 8 8 8 8 . . 0 24 8 0 0 0 0 0 0 None
  0x08d 24 dc 0 32 0 r y . 8 8 8 8 . . 0 24 8 16 16 16 16 0 0 Slow
  </code></pre>
  
  <p>As already said every installed OpenGL application works but the library is missing.
  I cannot find a "mesa" folder either.</p>