I compiled the release 0.21.6 on Centos 5.5 w/ Qt-4.7.2 and when I click on File > Open the tools crash w/ a segmentation fault.
I tried to use it w/ 4.5.3 (same thing) and w/ 4.5.1 it is working.
In all cases klayout start and I have the main window.
I can open a layout through File > Open Recent > (select a gds opened previously).
The tool can display the window for Layout Reader Options or the Setup window but when I click on File > Open, it begins to display the window (<1 sec) and crash w/ the msg below.
The Qt 4.5.1 was compiled on Centos 4.7 and the others on Centos 5.5.
The Qt packages come from here:
4.5.1 was from Trolltech site.
Linux linux27 2.6.18-194.17.1.el5 #1 SMP Wed Sep 29 12:50:31 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
klayout was compiled w/ the following options
./build.sh -qt $TOOLS_ROOT_COM/freeware/gnu/Trolltech/Qt-4.5.3 -rblib /usr/lib64/libruby.so.1.8 -rbinc /usr/lib64/ruby/1.8/x86_64-linux -platform linux-64-gcc-release
% setenv LD_LIBRARY_PATH $QT_ROOT/Qt-4.7.2/lib
klayout: [BUG] Segmentation fault
ruby 1.8.5 (2006-08-25) [x86_64-linux]