严重错误：zbar.h：没有这样的文件或目录

Question

I downloaded the zbar library and cloned the opencv-zbar repo in my home directory. Then I ran the following command $cmake . which gave my the error

 -- Could NOT find ZBAR (missing: ZBAR_LIBRARIES ZBAR_INCLUDE_DIR) CMake Error: The following variables are used in this project, but they are set to NOTFOUND. Please set them or make sure they are set and tested correctly in the CMake files: ZBAR_LIBRARIES linked by target "zbar_opencv" in directory /home/surabhi/opencv-zbar -- Configuring incomplete, errors occurred! See also "/home/surabhi/opencv-zbar/CMakeFiles/CMakeOutput.log". 

I then made two changes in my CMakeCache.txt as follows

//Path to a file.
ZBAR_INCLUDE_DIR:PATH=/usr/include/zbar

//Path to a library.
ZBAR_LIBRARIES:FILEPATH=/usr/lib/libzbar.so

because the were set to NOTFOUND .

It then gave me no errors

 -- Found ZBAR: /usr/lib/libzbar.so -- Configuring done -- Generating done -- Build files have been written to: /home/surabhi/opencv-zbar 

But when I run make

It gives the error:

 fatal error: zbar.h: No such file or directory #include <zbar.h> ^ compilation terminated. 

I don't understand why I get this error as It says Found ZBAR when I run cmake .

Thanks in advance

Answer 1

You need to do actually use the include dirs somewhere in your CMakeLists.txt so CMake knows that you actually want to use these include paths.

Examples:

include_directories(${ZBAR_INCLUDE_DIR})

Or the more modern, recommended way:

target_include_directories(zbar_opencv PRIVATE ${ZBAR_INCLUDE_DIR})