it did change today in libquicktime). pkg-config --cflags libquicktime
places the correct -I entry in $CFLAGS so that all applications need to do
is use <quicktime.h>.
The installed location of the quicktime headers changed from
$prefix/include/quicktime to $prefix/include/lqt to avoid a conflict with
OS/X (which has a damned caseinsensitive filesystem). <quicktime/quicktime.h>
was conflicting with the system's <QuickTime/QuickTime.h>. The libquicktime
maintainer suggested changing libquicktime to use 'lqt' instead.