Description:
avifile depends on qt3, not qt.

Additional info:
$ pacman -Q avifile
avifile 0.7.45-8

Steps to reproduce:

$ ldd /usr/bin/aviplay
linux-vdso.so.1 (0x00007ffffc7ff000)
libqavm-0.7.so.0 => /lib/libqavm-0.7.so.0 (0x00007fca212a5000)
libqt-mt.so.3 => not found
libaviplay-0.7.so.0 => /lib/libaviplay-0.7.so.0 (0x00000031aca00000)
libpthread.so.0 => /lib/libpthread.so.0 (0x000000315fc00000)
libstdc++.so.6 => /lib/libstdc++.so.6 (0x0000003165c00000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x0000003166000000)
libc.so.6 => /lib/libc.so.6 (0x000000315f800000)
libqt-mt.so.3 => not found
libnsl.so.1 => /lib/libnsl.so.1 (0x000000317a200000)
libdl.so.2 => /lib/libdl.so.2 (0x0000003160000000)
libm.so.6 => /lib/libm.so.6 (0x0000003160400000)
libSDL-1.2.so.0 => /lib/libSDL-1.2.so.0 (0x000000318ee00000)
libfreetype.so.6 => /lib/libfreetype.so.6 (0x0000003164000000)
libz.so.1 => /lib/libz.so.1 (0x0000003160800000)
libbz2.so.1.0 => /lib/libbz2.so.1.0 (0x0000003162800000)
libSM.so.6 => /lib/libSM.so.6 (0x000000316e400000)
libICE.so.6 => /lib/libICE.so.6 (0x000000316e800000)
libXinerama.so.1 => /lib/libXinerama.so.1 (0x0000003169200000)
libXv.so.1 => /lib/libXv.so.1 (0x000000319ca00000)
libXxf86vm.so.1 => /lib/libXxf86vm.so.1 (0x0000003195200000)
libXxf86dga.so.1 => /lib/libXxf86dga.so.1 (0x00000031a8200000)
libXi.so.6 => /lib/libXi.so.6 (0x0000003166800000)
libXext.so.6 => /lib/libXext.so.6 (0x0000003163c00000)
libX11.so.6 => /lib/libX11.so.6 (0x0000003162400000)
libXft.so.2 => /lib/libXft.so.2 (0x0000003190200000)
libXrender.so.1 => /lib/libXrender.so.1 (0x0000003165000000)
/lib/ld-linux-x86-64.so.2 (0x000000315f400000)
libuuid.so.1 => /lib/libuuid.so.1 (0x000000316b200000)
libxcb.so.1 => /lib/libxcb.so.1 (0x0000003162000000)
libfontconfig.so.1 => /lib/libfontconfig.so.1 (0x0000003164800000)
libXau.so.6 => /lib/libXau.so.6 (0x0000003161800000)
libXdmcp.so.6 => /lib/libXdmcp.so.6 (0x0000003161c00000)
libexpat.so.1 => /lib/libexpat.so.1 (0x0000003163800000)

$ pkgfile aviplay
community/avifile

$ pkgfile libqt-mt.so.3
extra/qt3

$ LANG=en_US pacman -Qi avifile | grep Depends
Depends On : qt sdl freetype2 libpng libjpeg libvorbis xvidcore libxxf86dga libxi libxv