arm_qt4.5_build怎么理解呀？

#!/bin/sh

if [ -d build/build_arm ] ; then
        echo "the build_arm directory is already !"
else
        mkdir -p build/build_arm
fi

if [ -d __install/arm ] ; then
        echo "the __install/arm directory is already !"
else
        mkdir -p __install/arm
fi

cd build/build_arm/

if [ -f Makefile ] ; then
        echo "the Makefile is already !"
else
        echo "Config Qt4.5 now, please wait ..."
        echo yes | ../../qt-embedded-linux-opensource-src-4.5.0/configure -prefix /opt/EmbedSky/qt-4.5/__install/arm/ -release -shared -fast -no-largefile -qt-sql-sqlite -no-qt3support -no-xmlpatterns -no-mmx -no-3dnow -no-sse -no-sse2 -no-svg -no-webkit -qt-zlib -qt-gif -qt-libtiff -qt-libpng -qt-libjpeg -make libs -nomake examples -nomake docs -nomake demo -no-nis -no-cups -no-iconv -no-dbus -no-openssl -xplatform qws/linux-arm-g++ -embedded arm -little-endian -qt-freetype -depths 16 -qt-gfx-linuxfb -qt-gfx-transformed -qt-gfx-multiscreen -no-gfx-vnc -no-gfx-qvfb -qt-kbd-usb -no-kbd-qvfb -no-glib -armfpa -no-mouse-qvfb -qt-mouse-linuxtp -qt-mouse-tslib -I/tslib-1.4/inclued -L/tslib-1.4/lib &&
        echo "Finished config Qt4.5 !"
fi

if [ -f lib/libQtCore.so.4.5.0 ] ; then
        echo "Qt4.5 library build complete !"
else
        echo "Build Qt4.5 library now, please wait ..."
        gmake &&
        echo "Finished build Qt4.5 !"
fi

if [ -f ../../__install/arm/lib/libQtCore.so.4.5.0 ] ; then
        echo "Qt4.5 library install in __install/arm/ !"
else
        echo "Install Qt4.5 library now, please wait ..."
        gmake install &&
        echo "Finished install Qt4.5 !"
fi

cd ../../
天嵌的高手们，这段arm的编译脚本怎么去理解，怎么修改呢？前面的还可以理解，特别是中间的那一长段，比如我现在要换一个交叉编译器还编译，还有去掉触摸屏的编译我应该怎么去改他呢？QT4.5库的编译和交叉编译器之间有联系吗？有劳天嵌的工程师帮我解答一下。

自己先顶一下！期待有高手来帮帮忙！

就是将ＱＴ编绎的过程写成脚本，一步完成
换交叉编绎器不用修改这个脚本，只需要将你的交叉编绎器加到系统环境变量中

ＱＴ4.5的库就是交叉编绎后生成的，这个库用的交叉编绎器要跟你内核用的一样。