I do not think it can be safe to define that in ld.so.conf because you are mixing libraries. If the program use first the incorrect one it will not work. But as a workaround... ok

Anyway your compiled version is not working for me. It say the same: Position unknown Speed: ----

but in the console it show:
CloudGPS 0.6.5
loaded the Generic plugin
loaded the N900 plugin
Compass sensor is not present

Location source initialized
GPS Satellite info source initialized
Accelerometer initialized
Opening font /opt/cloudgps/res/nokia_pure.ttf , size: 32


And when I close cloudgps:
Segmentation fault


And the satellite icon does not appears when cloudgps is open but with another program that uses the gps that does not happens.

I finally found my libraries:
/ $ ls /opt/qt*/lib/*Loc*
/opt/qtm11/lib/libQtLocation.so
/opt/qtm11/lib/libQtLocation.so.1
/opt/qtm11/lib/libQtLocation.so.1.1
/opt/qtm11/lib/libQtLocation.so.1.1.4
/opt/qtm12/lib/libQtLocation.so
/opt/qtm12/lib/libQtLocation.so.1
/opt/qtm12/lib/libQtLocation.so.1.2
/opt/qtm12/lib/libQtLocation.so.1.2.0


But still my cloudgps is not working.

bye