-prefix /opt/qt-&qt-version; : This command sets up
the install destination.
-qt-gif : This command adds support for gif
files to the libraries.
-system-libpng -system-libmng -system-zlib
-system-libjpeg : This command forces the library to use the
shared libraries that are on your system instead of recreating its own
set of support libraries for these functions.
-no-g++-exceptions : This command disables
the exceptions coding generated by the C++ compiler.
-thread : This command compiles the library
to support multi-threading.
ln -sf /opt/qt-&qt-version; /opt/qt : This command
standardizes the location of the qt libraries to the ld.so.conf entry