configure fails on systems w/o explicit /usr/lib64 (i.e. ubuntu & possibly others w/ /usr/lib/x86_64-linux-gnu/)

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What steps will reproduce the problem?
1. configure on 64-bit system w/o /usr/lib64 present  
2. also, repeat with specifying correct LDD_FLAGS, etc. --> still no dice

What is the expected output? What do you see instead?
 configure should complete(all dependencies are installed)
 instead, install fails with:
   configure: error: Could not link against -lGLU !
   configure: error: Could not link against -lGL !
 configure can be made to pass the first failure by injecting appropriate flags.   
 however, then the latter results.

What version of the product are you using? On what operating system?
Ubuntu 14.04, all of the dependencies installed I.A.W. INSTALL  

Please provide any additional information below.
I believe this stems from AX_CHECK_GL and AX_CHECK_GLU expecting 64-bit libs to 
be in /usr/lib64. It's common enough of an assumption that it's probably better 
to just add a note in the INSTALL file to the effect of :

    If configure fails with the following message:
         configure: error: Could not link against -lGLU !
    or:
         configure: error: Could not link against -lGL !

    then check to ensure your O/S includes a /usr/lib64 directory 
    for 64-bit libraries. If not, you may create a symlink to your 
    distro's 64-bit libraries:
          cd /usr
          sudo ln -s <your distro's 64-bit libs fullpath> lib64 
    for Ubuntu 14.04, for example, this would be 
          cd /usr
          sudo ln -s  /usr/lib/x86_64-linux-gnu/ lib64


Alternatively, you could add platform-awareness of lib64 location to the 
aforementioned checks. 
I have tried manually specifying the locations in invoking configure, but the 
flags don't seem to be applied until after the check is made, and I'm not savvy 
enough with auto-tools to grok what's happening.  

Original issue reported on code.google.com by [email protected] on 19 Feb 2015 at 8:39