mysterious buildsys/mock failure (maxima)

[Rex Dieter <rdieter math unl edu>]

Any pointers on debugging why maxima fails on the buildsys:
http://koji.fedoraproject.org/koji/buildinfo?buildID=29572
but succeeds on a local mock build
http://kdeforge.unl.edu/apt/kde-redhat/mock/fedora-9-x86_64-kde/maxima/

On the failure, build.log only reports (mysteriously): 
configure: error: unable to run gcl executable "gcl".

??

-- Rex