Tonight I got a try for QT4 SDK. It's a nice tool. But there is a error on building the demo project.
First, let's solve this error: Nokia QT4 SDK Beginner s Error FcFree TypeQuery Face.
Here is the way to solve this error for QT newbie, as me.


Now I will show how to build QT project with out this error.

Precondition:
my system is RHEL5.5
and my QT SDK is qt-sdk-linux-x86-opensource-2010.04.bin

Error:
FcFree TypeQuery Face

Solution:
download fontconfig-2.4.2.tar.gz
tar zxvf it and configure and make, but do not make install it.
here is the configure cmd string:
./configure --sysconfdir=/etc --prefix=/usr --mandir=/usr/share/man

my QT SDK is intalled here:
/opt/ins/qt4/qtsdk-2010.04/lib
________________________________________________________________________________
lrwxrwxrwx 1 root root  17 Aug 18 23:53 libQtGui.so.4 -> libQtGui.so.4.7.0
-rwxr-xr-x 1 root root 13M Jun 21 05:01 libQtGui.so.4.7.0
[root@localhost lib]#

red line shows that libQtGui.so.4 requires libfontconfig.so.1:
[root@localhost lib]# ldd libQtGui.so.4
        linux-gate.so.1 =>  (0x00390000)
        libQtCore.so.4 => /opt/ins/qt4/qtsdk-2010.04/lib/./libQtCore.so.4 (0x00ed2000)
        libpthread.so.0 => /lib/libpthread.so.0 (0x00110000)
        libgthread-2.0.so.0 => /lib/libgthread-2.0.so.0 (0x00128000)
        librt.so.1 => /lib/librt.so.1 (0x0012d000)
        libglib-2.0.so.0 => /lib/libglib-2.0.so.0 (0x00184000)
        libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x002ae000)
        libgobject-2.0.so.0 => /lib/libgobject-2.0.so.0 (0x00136000)
        libSM.so.6 => /usr/lib/libSM.so.6 (0x00175000)
        libICE.so.6 => /usr/lib/libICE.so.6 (0x00222000)
        libXrender.so.1 => /usr/lib/libXrender.so.1 (0x0023c000)
        libfontconfig.so.1 => /usr/lib/libfontconfig.so.1 (0x00245000)
        libz.so.1 => /usr/lib/libz.so.1 (0x0026f000)
        libXext.so.6 => /usr/lib/libXext.so.6 (0x0036f000)
        libX11.so.6 => /usr/lib/libX11.so.6 (0x03fe7000)
        libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x0671b000)
        libm.so.6 => /lib/libm.so.6 (0x0032e000)
        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00282000)
        libc.so.6 => /lib/libc.so.6 (0x01c1f000)
        libdl.so.2 => /lib/libdl.so.2 (0x0017e000)
        /lib/ld-linux.so.2 (0x00292000)
        libexpat.so.0 => /lib/libexpat.so.0 (0x050b5000)
        libXau.so.6 => /usr/lib/libXau.so.6 (0x0028e000)
        libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0x00355000)
[root@localhost lib]#

but the libfontconfig.so.1 in my system is out of date and not valid for QT SDK.
so, I download the newer one and make it.

no need to uninstall previous older one.
just backup it and link the newer one to /usr/lib

/usr/lib
________________________________________________________________________________
lrwxrwxrwx 1 root root   22 Aug 15 04:13 libfontconfig.so -> libfontconfig.so.1.1.0
lrwxrwxrwx 1 root root   69 Aug 19 00:51 libfontconfig.so.1 -> /opt/pro/uti/fontconfig/fontconfig-2.4.2/src/.libs/libfontconfig.so.1
-rwxr-xr-x 1 root root 190K Aug 24  2007 libfontconfig.so.1.1.0
lrwxrwxrwx 1 root root   22 Aug 15 04:08 libfontconfig.so.1.bak -> libfontconfig.so.1.1.0
[root@localhost lib]#


here is the cmd:
cd /usr/lib
mv libfontconfig.so.1 libfontconfig.so.1.bak
ln -s /opt/pro/uti/fontconfig/fontconfig-2.4.2/src/.libs/libfontconfig.so.1 /usr/lib/libfontconfig.so.1

after "make" of fontconfig, the so files are here:
/opt/pro/uti/fontconfig/fontconfig-2.4.2/src/.libs/libfontconfig.so.1
and you need to link it to /usr/lib/libfontconfig.so.1

close QT SDK and reboot it to build your project. that's okay.

If you really want to update rpm, just download fontconfig-2.4.2-3.fc7.i386.rpm
and fontconfig-devel-2.4.2-3.fc7.i386.rpm.
install them without dependence check:

rpm -Uvh --nodeps fontconfig-2.4.2-3.fc7.i386.rpm
rpm -Uvh --nodeps fontconfig-devel-2.4.2-3.fc7.i386.rpm

that's all.

Good luck.











Second, How to integrate QT SDK into Eclipse



Just download qtjambi-eclipse-integration-linux32-4.5.2_01.tar.gz
cd into your eclipse dir and tar xvf it under dropins as me.

/opt/ins/cpp/eclipse/dropins
________________________________________________________________________________
total 4.0K
drwxr-xr-x 4 root root 4.0K Jan  7  2010 qt-eclipse-integration-linux.x86-1.6.1
[root@localhost dropins]#

run eclipse with option -clean
/opt/ins/cpp/eclipse/eclipse -clean

Good luck.