64-bit linux machines and root


What is the proper architecture for 64–bit linux machines, ie for installation?

how should the command go?
what options whould be placed? also I’d like to enable qt.

./configure [arcitecture???] --enable-qt

many thanks.




I tried to build from source Root v5.20 and Rootv5.26 with

but both did not generate libGQt.so and several Qt libraries that are supposed to be dumped to $ROOTSYS/lib. Environment variables were set accordingly.

I am running Scientific Linux 2.6.18-238.1.1.el5 , x86_64 x86_64 x86_64 GNU/Linux. For the former, Qt3.3.8 was matched and for the latter with Qt4.4.0.

I am doing a migration of my codes from i686 to x86_64, and GQt was not a problem then with the 32-bit machine. el5 for 32-bit was then used, same gcc version. Are there known issues with x86_64 on the above-mentioned Root versions?

Thank you in advance.


Have you QTDIR env variable defined?
Are you sure you have Qt4 64-bits libraries installed ?

No, I am not aware about any x86_64 related issue