Linux nightmares (issues)

i found out the reason for the undefined reference:
on the first cmake CMakeLists.txt:

Code:

-- Found OpenGL: /usr/lib/x86_64-linux-gnu/libGL.so

http://www.opengl.org/discussion_boards/...ntervalEXT
if i try this:

Code:

nm -Do /usr/lib/x86_64-linux-gnu/libGL.so | grep glXSwapIntervalEXT

i get nothing. however, if i try with nvidia (my card is an nvidia) drivers libGL.so:

Code:

nm -Do /usr/lib/nvidia-331-updates/libGL.so | grep glXSwapIntervalEXT
/usr/lib/nvidia-331-updates/libGL.so:000000000007e270 T glXSwapIntervalEXT

what do you guys suggest me to do? shall i rename that libGL to something else and create a symbolic link instead?
edit: tried that and no errors testing now...
edit2: apparently it fails on runtime. it doesn't vsync at all. it compiles properly though