Hi,
I built Boost and Qt libs in Ubuntu with your project using 'make pthreads zlib boost qt'. No error messages were output.
Then I tried to build PCL version 1.7 from their repo in Github, using Cmake, like in the step 5b of the tutorial:
ccmake ../src -DCMAKE_TOOLCHAIN_FILE=/
home/a/c/mxe/usr/i686-pc-mingw32/share/cmake/mxe-conf.cmake
However, when configuring I got two errors, that Cmake can't find Boost.thread and QtCore.