#437 undocumented dependancies

[efa]

try to build the 1.3.3 on Ubuntu 64 bit
The following dependancies are not documented in README but needed for compilation:
qt4-qmake
libqt4-dev
libqt4-opengl-dev

more the following was installed by the distribution, but the linker seems cannot find them:
jhead
lib3ds-dev

those can discourage a beginner

[efa]

compilation ended with this error, while extenal libraries was compiled successfully and mpirxx.h is found in all subs of ./external/inc

make[1]: Entering directory `/home/efa/dLoad/meshlab/src/meshlabplugins/filter_csg'
g++ -c -m64 -pipe -O2 -Wall -W -D_REENTRANT -fPIC -DQT_NO_DEBUG -DQT_PLUGIN -DQT_SCRIPT_LIB -DQT_XMLPATTERNS_LIB -DQT_XML_LIB -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++-64 -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtOpenGL -I/usr/include/qt4/QtXml -I/usr/include/qt4/QtXmlPatterns -I/usr/include/qt4/QtScript -I/usr/include/qt4 -I../.. -I../../../../vcglib -I../../external/glew-1.7.0/include -I/usr/X11R6/include -I. -o filter_csg.o filter_csg.cpp
In file included from filter_csg.cpp:29:0:
gmpfrac.h:5:20: fatal error: mpirxx.h: No such file or directory
compilation terminated.

[efa]

$ find . -name "mpirxx.h"
./external/inc/macx/mpir-2.1.3/mpirxx.h
./external/inc/win32-gcc/mpir-2.2.1/mpirxx.h
./external/inc/macx64/mpir-2.4.0/mpirxx.h
./external/inc/win32-msvc2008/mpir-2.2.1_x64/mpirxx.h
./external/inc/linux-g++/mpir-2.4.0/mpirxx.h