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Hi Meena,

FSLeyes comes with its own version of freeglut, but this doesn't seem to be working for some reason. But you should be able to install freeglut via yum, rather than compiling it yourself:

sudo yum install freeglut

Cheers,

Paul

On 25 March 2018 at 02:18, Meena M. Makary <[log in to unmask]> wrote:
Thanks, Paul so much, really appreciate your fast reply!

I returned one step back and avoided the use of NoMachine (i.e, I hooked a screen to the Linux machine directly). I got a different error when I run Fsleyes:

[meena@ghine ~]$  WARNING          __init__.py  596: create          - GLContext callback function raised NullFunctionError: Attempt to call an undefined function glutInit, check for bool(glutInit) before calling
Traceback (most recent call last):
  File "fsleyes/gl/__init__.py", line 590, in create
  File "fsleyes/main.py", line 371, in realCallback
  File "fsleyes/gl/__init__.py", line 377, in bootstrap
  File "site-packages/OpenGL/GLUT/special.py", line 333, in glutInit
  File "site-packages/OpenGL/platform/baseplatform.py", line 407, in __call__
NullFunctionError: Attempt to call an undefined function glutInit, check for bool(glutInit) before calling

As the Fsleyes troubleshooting page suggested, I need to install glutInit. I followed the recommended link (http://freeglut.sourceforge.net/docs/install.php) and I followed the steps:
1- zcat freeglut-2.2.0.tar.bz2 | tar -vxf -
2- cd freeglut-2.X.X
3- LDFLAGS=-Wl,-R/usr/X11R6/lib ./configure
4- make all
5- make install

Steps (1-3) was done without errors. However, in step 4 (make all), it gave me this error:

make  all-recursive
make[1]: Entering directory `/home/meena/freeglut-2.8.0'
Making all in src
make[2]: Entering directory `/home/meena/freeglut-2.8.0/src'
/bin/sh ../libtool  --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I..  -I../include     -g -O2 -Wall -pedantic -MT libglut_la-freeglut_callbacks.lo -MD -MP -MF .deps/libglut_la-freeglut_callbacks.Tpo -c -o libglut_la-freeglut_callbacks.lo `test -f 'freeglut_callbacks.c' || echo './'`freeglut_callbacks.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I.. -I../include -g -O2 -Wall -pedantic -MT libglut_la-freeglut_callbacks.lo -MD -MP -MF .deps/libglut_la-freeglut_callbacks.Tpo -c freeglut_callbacks.c  -fPIC -DPIC -o .libs/libglut_la-freeglut_callbacks.o
In file included from ../include/GL/freeglut.h:17,
                 from freeglut_callbacks.c:28:
../include/GL/freeglut_std.h:123:20: error: GL/glu.h: No such file or directory
In file included from freeglut_callbacks.c:29:
freeglut_internal.h:112:39: error: X11/extensions/XInput.h: No such file or directory
make[2]: *** [libglut_la-freeglut_callbacks.lo] Error 1
make[2]: Leaving directory `/home/meena/freeglut-2.8.0/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/meena/freeglut-2.8.0'
make: *** [all] Error 2

I did these steps as a superuser as recommended and I tried different versions of the glutInit and all gave the same error message.

Unfortunately, I did not find any help online. Any direction I can try?

Thanks again Paul;
--Meena

On Sat, Mar 24, 2018 at 6:29 AM, paul mccarthy <[log in to unmask]> wrote:
Hi Meena,

You could try running FSLeyes with the LIBGL_ALWAYS_SOFTWARE environment variable, e.g.:

LIBGL_ALWAYS_SOFTWARE=1 fsleyes 

If FSLeyes works in this way, and is fast enough, then you can use this as a solution.

Alternately, one person has reported success in getting around this problem by following the steps described here:


I have translated the Ubuntu 14.04 instructions to their CentOS 6.9 equivalents here:


Let me know how you get on.

Cheers,

Paul

On 23 March 2018 at 21:09, Meena M. Makary <[log in to unmask]> wrote:
Dear FSL experts;

I am trying to run FSLeyes from "NoMachine” on Centos 6.9 and it gives me the following error:

WARNING          __init__.py  596: create          - GLContext callback function raised RuntimeError: OpenGL 1.4 or newer is required (detected version: 1.2
Traceback (most recent call last):
  File "fsleyes/gl/__init__.py", line 590, in create
  File "fsleyes/main.py", line 371, in realCallback
  File "fsleyes/gl/__init__.py", line 315, in bootstrap
RuntimeError: OpenGL 1.4 or newer is required (detected version: 1.2

I tried “unset LIBGL_ALWAYS_INDIRECT “, as recommended on the troubleshooting page (https://users.fmrib.ox.ac.uk/~paulmc/fsleyes/userdoc/latest/troubleshooting.html), and still gives me the same error.

Any help would be much appreciated!

Thanks,

-- 
Meena M. Makary, Ph.D.
Assistant Professor | Cairo University 
Postdoctoral Fellow | Yale University School of Medicine
Postdoctoral Associate |  The John B. Pierce Laboratory





--

Meena M. Makary, Ph.D.
Assistant Professor | Cairo University 
Postdoctoral Fellow | Yale University School of Medicine
Postdoctoral Associate |  The John B. Pierce Laboratory
Executive Committee Member | OHBM Student and Postdoc SIG