190.42 x86_64 FlightGear -OpenGL version test failed
 

Got an X11ErrorHandling call display=0xec1b10 event=0x7fff08decaf0
BadValue (integer parameter out of range for operation)
Major opcode: 1
Minor opcode: 0
Error code: 2
Request serial: 32
Current serial: 37
Value: 0
Got an X11ErrorHandling call display=0xec1b10 event=0x7fff08decaf0
BadWindow (invalid Window parameter)
Major opcode: 18
Minor opcode: 0
Error code: 3
Request serial: 33
Current serial: 37
ResourceID: 31457283
Got an X11ErrorHandling call display=0xec1b10 event=0x7fff08decaf0
BadWindow (invalid Window parameter)
Major opcode: 18
Minor opcode: 0
Error code: 3
Request serial: 34
Current serial: 37
ResourceID: 31457283
Got an X11ErrorHandling call display=0xec1b10 event=0x7fff08decaf0
BadWindow (invalid Window parameter)
Major opcode: 18
Minor opcode: 0
Error code: 3
Request serial: 35
Current serial: 37
ResourceID: 31457283
Got an X11ErrorHandling call display=0xec1b10 event=0x7fff08decaf0
BadWindow (invalid Window parameter)
Major opcode: 8
Minor opcode: 0
Error code: 3
Request serial: 36
Current serial: 37
ResourceID: 31457283
Got an X11ErrorHandling call display=0xec1b10 event=0x7fff08decc40
BadWindow (invalid Window parameter)
Major opcode: 18
Minor opcode: 0
Error code: 3
Request serial: 41
Current serial: 42
ResourceID: 31457283
Got an X11ErrorHandling call display=0xec1b10 event=0x7fff08deccb0
BadWindow (invalid Window parameter)
Major opcode: 18
Minor opcode: 0
Error code: 3
Request serial: 45
Current serial: 46
ResourceID: 31457283
Got an X11ErrorHandling call display=0xec1b10 event=0x7fff08decc20
BadWindow (invalid Window parameter)
Major opcode: 3
Minor opcode: 0
Error code: 3
Request serial: 47
Current serial: 48
ResourceID: 31457283
Got an X11ErrorHandling call display=0xf372e0 event=0x7fff08deccb0
BadWindow (invalid Window parameter)
Major opcode: 2
Minor opcode: 0
Error code: 3
Request serial: 7
Current serial: 8
ResourceID: 31457283
Got an X11ErrorHandling call display=0xec1b10 event=0x7fff08ded1b0
BadWindow (invalid Window parameter)
Major opcode: 8
Minor opcode: 0
Error code: 3
Request serial: 49
Current serial: 50
ResourceID: 31457283
Got an X11ErrorHandling call display=0xec1b10 event=0x7fff08ded230
BadWindow (invalid Window parameter)
Major opcode: 38
Minor opcode: 0
Error code: 3
Request serial: 50
Current serial: 50
ResourceID: 31457283
Got an X11ErrorHandling call display=0xec1b10 event=0x7fff08decd20
GLXBadDrawable
Major opcode: 135
Minor opcode: 5
Error code: 146
Request serial: 51
Current serial: 51
ResourceID: 31457283
Error: In Texture::Extensions::setupGLExtensions(..) OpenGL version test failed, requires valid graphics context.

I rebuilt FlightGear after the driver was installed.
Tried "chcon"
# ls -l /usr/lib64/xorg/modules/drivers/nvidia_drv.so
-rwxr-xr-x 1 root root 4518568 Nov 7 02:54 /usr/lib64/xorg/modules/drivers/nvidia_drv.so*

slipstream:~ # chcon -t texrel_shlib_t /usr/lib64/xorg/modules/extensions/libglx.so
chcon: can't apply partial context to unlabeled file `/usr/lib64/xorg/modules/extensions/libglx.so'
slipstream:~ # chcon -t texrel_shlib_t /usr/lib64/xorg/modules/extensions/libglx.so.190.42
chcon: can't apply partial context to unlabeled file `/usr/lib64/xorg/modules/extensions/libglx.so.190.42'
slipstream:~ # chcon -t texrel_shlib_t /usr/lib64/libGLcore.so.190.42
chcon: can't apply partial context to unlabeled file `/usr/lib64/libGLcore.so.190.42'

Re: 190.42 x86_64 FlightGear -OpenGL version test failed
 

Other suspects could be Mesa, and freeglut, I shall have to dig further.
# ldd /usr/local/bin/fgfs
linux-vdso.so.1 => (0x00007fff83fff000)
libplibpuaux.so.0 => /usr/lib64/libplibpuaux.so.0 (0x00007f2ca437d000)
libplibpu.so.0 => /usr/lib64/libplibpu.so.0 (0x00007f2ca415e000)
libplibfnt.so.0 => /usr/lib64/libplibfnt.so.0 (0x00007f2ca3f45000)
libplibjs.so.0 => /usr/lib64/libplibjs.so.0 (0x00007f2ca3d42000)
libplibnet.so.0 => /usr/lib64/libplibnet.so.0 (0x00007f2ca3b39000)
libplibsg.so.0 => /usr/lib64/libplibsg.so.0 (0x00007f2ca3925000)
libplibul.so.0 => /usr/lib64/libplibul.so.0 (0x00007f2ca371f000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f2ca3503000)
libz.so.1 => /lib64/libz.so.1 (0x00007f2ca32ed000)
libglut.so.3 => /usr/lib64/libglut.so.3 (0x00007f2ca30a5000)
libGLU.so.1 => /usr/lib64/libGLU.so.1 (0x00007f2ca2e34000)
libGL.so.1 => /usr/lib64/libGL.so.1 (0x00007f2ca2c3c000)
libXmu.so.6 => /usr/lib64/libXmu.so.6 (0x00007f2ca2a22000)
libXt.so.6 => /usr/lib64/libXt.so.6 (0x00007f2ca27bd000)
libSM.so.6 => /usr/lib64/libSM.so.6 (0x00007f2ca25b4000)
libICE.so.6 => /usr/lib64/libICE.so.6 (0x00007f2ca2397000)
libXi.so.6 => /usr/lib64/libXi.so.6 (0x00007f2ca218c000)
libXext.so.6 => /usr/lib64/libXext.so.6 (0x00007f2ca1f7a000)
libX11.so.6 => /usr/lib64/libX11.so.6 (0x00007f2ca1c3e000)
librt.so.1 => /lib64/librt.so.1 (0x00007f2ca1a35000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f2ca1831000)
libalut.so.0 => /usr/lib64/libalut.so.0 (0x00007f2ca1629000)
libopenal.so.1 => /usr/lib64/libopenal.so.1 (0x00007f2ca13d8000)
libm.so.6 => /lib64/libm.so.6 (0x00007f2ca1183000)
libosgParticle.so.55 => /usr/local/lib64/libosgParticle.so.55 (0x00007f2ca0f33000)
libosgSim.so.55 => /usr/local/lib64/libosgSim.so.55 (0x00007f2ca0c8e000)
libosgViewer.so.55 => /usr/local/lib64/libosgViewer.so.55 (0x00007f2ca09d5000)
libosgGA.so.55 => /usr/local/lib64/libosgGA.so.55 (0x00007f2ca077d000)
libosgText.so.55 => /usr/local/lib64/libosgText.so.55 (0x00007f2ca052e000)
libosgDB.so.55 => /usr/local/lib64/libosgDB.so.55 (0x00007f2ca02a0000)
libosgUtil.so.55 => /usr/local/lib64/libosgUtil.so.55 (0x00007f2c9ff20000)
libosg.so.55 => /usr/local/lib64/libosg.so.55 (0x00007f2c9fa93000)
libOpenThreads.so.11 => /usr/local/lib64/libOpenThreads.so.11 (0x00007f2c9f88b000)
libosgFX.so.55 => /usr/local/lib64/libosgFX.so.55 (0x00007f2c9f65b000)
libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x00007f2c9f34d000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f2c9f136000)
libc.so.6 => /lib64/libc.so.6 (0x00007f2c9eddb000)
/lib64/ld-linux-x86-64.so.2 (0x00007f2ca45a1000)
libXxf86vm.so.1 => /usr/lib64/libXxf86vm.so.1 (0x00007f2c9ebd5000)
libGLcore.so.1 => /usr/lib64/libGLcore.so.1 (0x00007f2c9d778000)
libnvidia-tls.so.1 => /usr/lib64/tls/libnvidia-tls.so.1 (0x00007f2ca4640000)
libuuid.so.1 => /lib64/libuuid.so.1 (0x00007f2c9d573000)
libxcb.so.1 => /usr/lib64/libxcb.so.1 (0x00007f2c9d356000)
libXrandr.so.2 => /usr/lib64/libXrandr.so.2 (0x00007f2c9d14d000)
libXau.so.6 => /usr/lib64/libXau.so.6 (0x00007f2c9cf49000)
libXrender.so.1 => /usr/lib64/libXrender.so.1 (0x00007f2c9cd3f000)