looks like configure is looking for the moc executable. It is part of qt, althrought not a library. QT uses this program to parse your code, find the slots, and automaticly generated the headers he needs.
You should check where is the program, it shoudl be acessible throught the PATH. If not, you can try passing the --with-qt-moc=PATH_TO_MOC argument to configure
For exemple,
"./configure --with-qt-moc=/usr/bin/moc"
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