编译过程:

g++ -std=c++11 2.cpp $LD_LIBRARY_PATH/libbgslibrary_core.so `pkg-config --cflags --libs opencv`

 错误：

undefined reference to `bgslibrary::algorithms::FrameDifference::FrameDifference()

解决：

1If you are compiling in Linux OS, then (after install the library):
2
3Assuming that the libbgslibrary_core.so file is located in /usr/local/lib
4
5======================================================
6
7To solve this temporarily (only in this bash session):
8$ LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib
9$ export LD_LIBRARY_PATH
10
11======================================================
12
13To solve this permanent:
14$ sudo echo 'export LD_LIBRARY_PATH=/usr/local/lib' >> ~/.bashrc
15
16======================================================
17
18And to compile your program include this flag: $LD_LIBRARY_PATH/libbgslibrary_core.so
19
20It should be like: $ g++ -std=c++14 Demo.cpp $LD_LIBRARY_PATH/libbgslibrary_core.so `pkg-config --cflags --libs opencv`