-xrandr -xinerama MUST BE passed to configure to enable multi-monitors support on kde4.8

By default, configure script enable Xrandr and Xinerama support.

configure --help returns :

.....

    -no-xrandr ......... Do not compile Xrandr (resize and rotate) support.
 *  -xrandr ............ Compile Xrandr support.
                         Requires X11/extensions/Xrandr.h and libXrandr.
.....

    -no-xinerama ....... Do not compile Xinerama (multihead) support.
 *  -xinerama .......... Compile Xinerama support.
                         Requires X11/extensions/Xinerama.h and libXinerama.
                         By default, Xinerama support will be compiled if
                         available and the shared libraries are dynamically
                         loaded at runtime.

This two features are used by kde4.8.x to manage multi-monitors support. A naive user will think that it's not necessary to give these two options to configure script. However, in such case, multi-monitor support will not work correctly, and kde4 will not be able to manage one desktop per monitor as it should do, but will spread a big desktop along the two screens.

In order to have a fully multi-monitor support, one must compile qt4 by giving "-xrandr" and "-xinerama" to qt4 configure script.

So why to say that xrandr and xinerama are selected by default in configure ?

a) If we look at closely to that script, we will see that by default, xrandr and xinerama are activated in "runtime" mode, and in such mode NOT all the qt4 libraries will be linked against libXrandr.so and libXinerama.so.

b) In the opposite, if we give explicitly "-xrandr" and "-xinerama" to configure script, then ALL qt libraries which need xrandr/xinerama support will be linked against libXrandr.so/libXinerama.so.

in a), command
ldd /usr/lib64/libQtGui.so|grep -iE "(xinerama|xrandr)"
gives nothing

in b), command
ldd /usr/lib64/libQtGui.so|grep -iE "(xinerama|xrandr)"
returns
libXrandr.so.2 => /usr/lib64/libXrandr.so.2 (0x00007f7ac34b2000)
libXinerama.so.1 => /usr/lib64/libXinerama.so.1 (0x00007f7ac32ae000)

So here is the question :

why xrandr/xinerama support/activation is so much confusing in configure script ? Would it be possible to put some extra information for warning people that will compile qt4 for kde4 ?

Thanks.
JC