++++++++++++++++++++++++++++++++ 1. Build opencv2411 for PC ++++++++++++++++++++++++++++++++- download opencv2411.zip to D:\Download\ubuntu_pkg\opencv2411.zip- extract here- create 2 folder on desktop: + cmake_cfg_files: contain cmake configure files+ opencv_lib_pc: output library for pc (make install)open CMake, config src: browse to d:\download\ubuntu_pkg\opencv2411 des: desktop\cmake_cfg_filesCMAKE_INSTALL_PREFIX: /usr/local (default)uncheck WITH_OPENEXR, WITH_TIFF, click Configure (Done), click Generate (done).Open Terminal, cd to cmake_cfg_files, then type make (elapse time (1:30 min) from: 19:46PM-21:04PM)- make install, will install opencv library to CMAKE_INSTALL_PREFIX directory.for my example: I installed opencv2411 to "opencv_lib_pc" and "opencv_lib_pc_2411"Done..++++++++++++++++++++++++++++++++ 2. Build opencv2411 for Kit ++++++++++++++++++++++++++++++++- use arm-gcc toolchain from DISKA, extract arm-linux-gcc-4.5.1-v6-vfp-20120301.tgz to /opt/FriendlyARM/toolschain/4.5.1/bin- add path of toolchain to PATH: vi ~/.bashrc, add this to the end of file:PATH=$PATH:/opt/FriendlyARM/toolschain/4.5.1/binPKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfigexport PKG_CONFIG_PATH- check toolchain work: open terminal type arm-linux-gcc --version- create folder "cmake_cfg_files_kit": contain cmake configuration file- create folder "opencv2411_lib_kit": installed folder (make install)- open CMake, Unix makefiles - Specify options for cross-compilingOperating System: arm-linux | Processor: ARMCompiler:C /opt/FriendlyARM/toolschain/4.5.1/bin/arm-linux-gccC++ /opt/FriendlyARM/toolschain/4.5.1/bin/arm-linux-g++Target Root: /opt/FriendlyARM/toolschain/4.5.1. Finish- INSTALL PREFIX: browse to "opencv2411_lib_kit" folder, uncheck OPENEXR, TIFF- modify "/home/giang/Desktop/cmake_cfg_files_kit/CMakeCache.txt" LINKER_FLAG:STRING=-lpthread -lrtcd to cmake_cfg_files_kit directory, then make, eslapse time from: 21:25PM- ***ERROR ****Ref from: http://blog.csdn.net/jiebaoabcabc/article/details/22935185[ 63%] Building CXX object modules/ocl/CMakeFiles/opencv_perf_ocl.dir/perf/perf_stat.cpp.objLinking CXX executable ../../bin/opencv_perf_ocl../../lib/libopencv_ocl.so: undefined reference to `dlopen'../../lib/libopencv_ocl.so: undefined reference to `dlsym'collect2: ld returned 1 exit statusmake[2]: *** [bin/opencv_perf_ocl] Error 1make[1]: *** [modules/ocl/CMakeFiles/opencv_perf_ocl.dir/all] Error 2make: *** [all] Error 2Solve: add -ldl to CmakeCache.txt as below, then make clean, makeCMAKE_EXE_LINKER_FLAGS:STRING=-lpthread -ldl -lrt(Eslapse time from 8:50AM - 10:25AM)make installDone! (installed to opencv2411_lib_kit)+++++++++++++++++++++++++++++++++++++++++++++++++ 3. compile tslib for arm, follow guide is OK +++++++++++++++++++++++++++++++++++++++++++++++++create /home/qtTut folder, then clone tslib source.cd /home/qtTutgit-clone git clone http://github.com/kergoth/tslib.gitcd tslib./autogen.sh./configure --host=arm-angstrom-linux-gnueabi --prefix=/usr/local/tslib --enable-static --enable-sharedmakemake installYou will see tslib is installed to /usr/local/tslib+++++++++++++++++++++++++++++++++++++++++++++++++ 4. QT Everywhere++++++++++++++++++++++++++++++++++++++++++++++++copy arm-qte-4.8.5-20131207.tar.gz from DISK_A, then extract gz file you will qt-everywhere-opensource-src-4.8.5.tar.gz fileextract this file to "qt-everywhere-opensource-src-4.8.5"Here: /home/giang/friendlyArm_tools- add path environtment: $HOME/qt-everywhere-opensource-src-4.8.5PATH=$PATH:/home/giang/friendlyArm_tools/arm-qte-4.8.5-modify /home/giang/friendlyArm_tools/arm-qte-4.8.5/qt-everywhere-opensource-src-4.8.5/mkspecs/qws/linux-arm-g++/qmake.conf---qmake.conf origin----## qmake configuration for building with arm-linux-g++#include(../../common/linux.conf)include(../../common/gcc-base-unix.conf)include(../../common/g++-unix.conf)include(../../common/qws.conf)# modifications to g++.confQMAKE_CC = arm-linux-gccQMAKE_CXX = arm-linux-g++QMAKE_LINK = arm-linux-g++QMAKE_LINK_SHLIB = arm-linux-g++# modifications to linux.confQMAKE_AR = arm-linux-ar cqsQMAKE_OBJCOPY = arm-linux-objcopyQMAKE_STRIP = arm-linux-stripload(qt_config)------------------------qmake.conf new--------## qmake configuration for building with arm-linux-g++#include(../../common/g++.conf)include(../../common/linux.conf)include(../../common/qws.conf)# modifications to g++.confQMAKE_CC = /opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-gccQMAKE_CXX = /opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-g++QMAKE_LINK = /opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-g++QMAKE_LINK_SHLIB= /opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-g++# modifications to linux.confQMAKE_AR = /opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-ar cqsQMAKE_OBJCOPY = /opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-objcopyQMAKE_STRIP = /opt/FriendlyARM/toolschain/4.5.1/bin/arm-none-linux-gnueabi-stripQMAKE_INCDIR += /opt/tslib/includeQMAKE_LIBDIR += /opt/tslib/libload(qt_config)------end ---cd to /home/giang/friendlyArm_tools/arm-qte-4.8.5/qt-everywhere-opensource-src-4.8.5./configure --prefix=/opt/qte -embedded arm -xplatform qws/linux-arm-g++ -qt-mouse-tslib -little-endian -no-qt3support -fast -no-largefile -qt-sql-sqlite -nomake tools -nomake demos -nomake examples -no-webkit -no-multimedia -no-javascript-jitIf error:https://forum.qt.io/topic/26245/solved-error-while-making-qt-4-8-4-for-armfatal error: .pch/debug-shared-emb-arm/QtGui: No such file or directorycompilation terminated.Reconfig with -no-pch option as below:./configure --prefix=/opt/qte -embedded arm -xplatform qws/linux-arm-g++ -qt-mouse-tslib -little-endian -no-qt3support -fast -no-largefile -qt-sql-sqlite -nomake tools -nomake demos -nomake examples -no-webkit -no-multimedia -no-javascript-jit -no-pchConfigure Done.- Download http://www.opensource.apple.com/source/gcc/gcc-5664/gcc/config/arm/arm_neon.h, copy paste to /home/giang/friendlyArm_tools/arm-qte-4.8.5/qt-everywhere-opensource-src-4.8.5/src/gui/image- Modify qimage_neon.cpp: add "#include " below this line #ifdef QT_HAVE_NEON:-gedit qt-everywhere-opensource/src/gui/Makefile, add to CFLAGS this option-mfloat-abi=softfp -mfpu=neon-gedit qt-everywhere-opensource/src/corelib/Makefile, add to CFLAGS & CXXFLAGS below option: -marm-remove all *.pch in qt-everywhere-opensource/src/corelib & qt-everywhere-opensource/src/gui-make -j4-make installDone.Output here: /opt/qte