真的已經好就不用C++了，但是一旦要移植項目或者進行項目部署，不用C++那是不可能的，所以下面僅僅是安裝一個DLIB庫是一個現代的C++工具包，包含機器學習算法和工具，用於在C++中創建複雜的軟件來解決實際問題。
好了，這個都是官話。。。
首先要下載源碼，對應地址在：http://dlib.net/
下載完後，解壓後，cd到對應路徑之下
cd dlib-19.17
mkdir build
cd build
cmake ..
cmake --build .
make install
其實這就安裝好了，如果你認爲結束了，那麼可能就想多了，接下來重點來了
當LZ想要編譯dlib19.17當中的examples的時候，結果就悲劇了。。。
cd examples
mkdir build
cmake ..
cmake --build .
報錯開始
/usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.9: undefined reference to `TIFFReadRGBAStrip@LIBTIFF_4.0'
/usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.9: undefined reference to `TIFFIsTiled@LIBTIFF_4.0'
/usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.9: undefined reference to `TIFFWriteScanline@LIBTIFF_4.0'
/usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.9: undefined reference to `TIFFGetField@LIBTIFF_4.0'
/usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.9: undefined reference to `TIFFScanlineSize@LIBTIFF_4.0'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libSM.so: undefined reference to `uuid_generate@UUID_1.0'
/usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.9: undefined reference to `TIFFReadEncodedTile@LIBTIFF_4.0'
/usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.9: undefined reference to `TIFFReadRGBATile@LIBTIFF_4.0'
/usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.9: undefined reference to `TIFFClose@LIBTIFF_4.0'
/usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.9: undefined reference to `TIFFRGBAImageOK@LIBTIFF_4.0'
/usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.9: undefined reference to `TIFFOpen@LIBTIFF_4.0'
/usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.9: undefined reference to `TIFFReadEncodedStrip@LIBTIFF_4.0'
/usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.9: undefined reference to `TIFFSetField@LIBTIFF_4.0'
/usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.9: undefined reference to `TIFFSetWarningHandler@LIBTIFF_4.0'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libSM.so: undefined reference to `uuid_unparse_lower@UUID_1.0'
/usr/lib/x86_64-linux-gnu/libopencv_highgui.so.2.4.9: undefined reference to `TIFFSetErrorHandler@LIBTIFF_4.0'
collect2: error: ld returned 1 exit status
CMakeFiles/webcam_face_pose_ex.dir/build.make:131: recipe for target 'webcam_face_pose_ex' failed
make[2]: *** [webcam_face_pose_ex] Error 1
CMakeFiles/Makefile2:1954: recipe for target 'CMakeFiles/webcam_face_pose_ex.dir/all' failed
make[1]: *** [CMakeFiles/webcam_face_pose_ex.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2
查了很多資料，有的說是權限問題，LZ加了sudo，然而並沒有什麼用。
第二種：註釋掉Anaconda路徑
sudo gedit ~/.bashrc
LZ把當中帶有Anaconda字眼的全部註釋，然而。。。並沒有什麼用。。。
第三種：強行安裝
sudo apt-get install libtiff4-dev
然而也沒有什麼用。。。
解決方案來了
locate libtiff.so
結果顯示：
/home/felaim/anaconda3/lib/libtiff.so
/home/felaim/anaconda3/lib/libtiff.so.5
/home/felaim/anaconda3/lib/libtiff.so.5.4.0
/home/felaim/anaconda3/pkgs/libtiff-4.0.10-h2733197_2/lib/libtiff.so
/home/felaim/anaconda3/pkgs/libtiff-4.0.10-h2733197_2/lib/libtiff.so.5
/home/felaim/anaconda3/pkgs/libtiff-4.0.10-h2733197_2/lib/libtiff.so.5.4.0
/usr/lib/x86_64-linux-gnu/libtiff.so
/usr/lib/x86_64-linux-gnu/libtiff.so.5
/usr/lib/x86_64-linux-gnu/libtiff.so.5.2.4
/usr/local/MATLAB/R2015b/bin/glnxa64/libtiff.so.5
/usr/local/MATLAB/R2015b/bin/glnxa64/libtiff.so.5.0.5
果然是和anaconda衝突了，下面比較暴力的方法
mv /home/felaim/anaconda3/lib/libtiff.so* /home/felaim/Documents/temp/
你衝突了，我就暫時把你挪走，然後編譯開始。。。問題解決。
有了前面的操作，後面又遇到一個問題：
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libSM.so: undefined reference to `uuid_generate@UUID_1.0'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libSM.so: undefined reference to `uuid_unparse_lower@UUID_1.0'
collect2: error: ld returned 1 exit status
CMakeFiles/webcam_face_pose_ex.dir/build.make:131: recipe for target 'webcam_face_pose_ex' failed
make[2]: *** [webcam_face_pose_ex] Error 1
CMakeFiles/Makefile2:1954: recipe for target 'CMakeFiles/webcam_face_pose_ex.dir/all' failed
make[1]: *** [CMakeFiles/webcam_face_pose_ex.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2
LZ對libuuid也locate一下
locate libuuid
發現也是和anaconda衝突了，把anaconda中對應libuuid的庫移走，然後就可以編譯了。
PS：編譯完成後別忘了挪回來
項目ddl提前了一個月/(ㄒoㄒ)/~~