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/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.1/../../../../lib/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /lib/../lib/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /usr/lib/../lib/libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.1/../../../libGL.so when searching for -lGL
/usr/bin/ld: skipping incompatible /usr/lib/libGL.so when searching for -lGL
/usr/bin/ld: cannot find -lGL
collect2: error: ld returned 1 exit status

/usr/lib/libGL.so:                        symbolic link to `libGL.so.1'
/usr/lib/libGL.so.1:                      symbolic link to `libGL.so.304.43'
/usr/lib/libGL.so.304.43:                 ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
/usr/lib64/libGL.so:                      symbolic link to `libGL.so.1'
/usr/lib64/libGL.so.1:                    symbolic link to `libGL.so.304.43'
/usr/lib64/libGL.so.304.43:               ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, stripped