Fedora 10 Problem: Cannot find CTL module "transform_RRT"

On Fedora 64bit, exrdisplay is not able to display an .exr image.

$ exrdisplay lighting.exr 
Warning: Environment variable CTL_DISPLAY_TRANSFORM is not set; using default value ("transform_display_video").
Warning: Environment variable CTL_DISPLAY_CHROMATICITIES is not set; using default value (chromaticities according to Rec. ITU-R BT.709).
Warning: Environment variable CTL_DISPLAY_WHITE_LUMINANCE  is is not set; using default value (120 candelas per square meter).
Warning: Environment variable CTL_DISPLAY_SURROUND_LUMINANCE  is is not set; using default value (12 candelas per square meter).
Cannot find CTL module "transform_RRT".

Solution I: Set the CTL module path manually.

user$ CTL_MODULE_PATH=/usr/lib64/CTL exrdisplay lighting.exr

or

Solution II: Install the 32bit CTL library (OpenEXR_CTL-libs.i386)

root% yum install OpenEXR_CTL-libs.i386
user$ exrdisplay lighting.exr

or

Solution III: Link the expected CTL module path.

# This assumes the 32bit CTL library (OpenEXR_CTL-libs.i386) is not installed.
root% cd /usr/lib
root% ln -s ../lib64/CTL
user$ exrdisplay lighting.exr