FAQ: Unable to resolve GL/GLX symbols (and/or Xmu symbols)

[Anders Blom]

It is quite common, on several different different Linux distributions, to encounter the following error message when you launch VNL after installing it:

Unable to resolve GL/GLX symbols - please check your GL library installation.

The solution is relatively simple. Locate the library libGL.so. To do this, give the command (as root, in /)

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find -iname libGL.so*

Most likely this returns something like

./usr/lib64/libGL.so.1 ./usr/lib64/libGL.so.1.2 ./usr/lib/libGL.so.1 ./usr/lib/libGL.so.1.2

What we need to do, is link VNL to the 32-bit libGL.so.1 library. Go to the lib directory in the VNL installation, and give the command

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ln -s /usr/lib/libGL.so.1 libGL.so

In many cases, this will not be sufficient to resolve the problem entirely, however. When you again try to launch VNL, you may now instead get the error message

Unable to resolve Xmu symbols - please check your Xmu library installation.

The solution is similar. Locate the library libXmu.so by giving the command (as root, in /)

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find -iname libXmu.so*

Most likely this returns something like

./usr/lib64/libXmu.so.6.2.0 ./usr/lib64/libXmu.so.6 ./usr/lib/libXmu.so.6.2.0 ./usr/lib/libXmu.so.6

What we need to do, is link VNL to the 32-bit libXmu.so.6 library. Go to the lib directory in the VNL installation, and give the command (if a link/file libXmu.so already exists in this folder, remove it first)

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ln -s /usr/lib/libXmu.so.6 libXmu.so

[Anders Blom]

On the 64-bit edition of RedHat Enterprise Linux 5, there are sometimes no 32-bit Xmu libraries installed. In that case, the above will not help (you still get the Xmu error), and to solve it you need to download and install a compatibility library containing libXmu.so in a 32-bit version.

• Download the library compat-libs-5.2-2.i386.rpm from http://rpm.pbone.net/index.php3/stat/4/idpl/2396107/com/compat-libs-5.2-2.i386.rpm.html
• Install it with the command:

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rpm --install compat-libs-5.2-2.i386.rpm

• Search for the library libXmu.so (as root in /):

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find -iname libXmu.so*

This should return something like

./usr/lib64/libXmu.so.6 ./usr/lib64/libXmu.so.6.2.0 ./usr/i386-glibc20-linux/lib/libXmu.so.6 ./usr/i386-glibc20-linux/lib/libXmu.so.6.0 ./usr/i386-glibc20-linux/lib/libXmu.so

• Go to the folder lib in the VNL installation directory
• Create a symbolic link to the identified libXmu.so.6.0 library (if a libXmu.so file exist in the lib folder, remove it first):

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ln -s /usr/i386-glibc20-linux/lib/libXmu.so.6.0 libXmu.so.6

• Create an additional symbolic link libXmu.so (as both libXmu.so and libXmu.so.6 is needed):

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ln -s /usr/i386-glibc20-linux/lib/libXmu.so.6.0 libXmu.so