CMake can not find include files

c++, cmake, makefile

Solution

There were two problems. Firstly you have to add the `jsoncpp/json` path to your included directories. However, doing so creates a second problem. Since your executables are not in the source folder you needed to prefix `${CMAKE_SOURCE_DIR}` to your paths so `include_directories()` would look like following:

include_directories("${CMAKE_SOURCE_DIR}/jsoncpp"
    "${CMAKE_SOURCE_DIR}/jsoncpp/json"
    "${CMAKE_SOURCE_DIR}/jsonreader")

I've added quotes just out of habit. I do this most of the time with my `CMakeLists.txt` so there are no problems with spaces in paths.

Problem

I have a project with the following layout: ``` /build /source +--- CMakeLists.txt | +--- /bin | +--CMakefiles.txt | +--main.cpp | +--- /jsoncpp | +--- /json | | +--json.h | | +--json-forwards.h | | | +--jsoncpp.cpp | +--CMakeLists.txt | +--- /jsonreader +-- jsonreader.cpp +-- jsonreader.h +-- CMakeLists.txt ``` In /source/CMakeLists.txt i have this line of code; ``` include_directories(jsoncpp jsonreader) ``` but then running 'cmake -G "MSYS Makefiles" ../source' in build directory generates Makefile and then running 'make' generates the following error: ``` Scanning dependencies of target updater [ 33%] Building CXX object bin/CMakeFiles/updater.dir/main.cpp.obj In file included from k:/own-projects/updater-Project/withJsonCpp/source/bin/main.cpp:2:0: ../source/jsonreader/jsonreader.h:2:18: fatal error: json.h: No such file or directory compilation terminated. make[2]: *** [bin/CMakeFiles/updater.dir/main.cpp.obj] Error 1 make[1]: *** [bin/CMakeFiles/updater.dir/all] Error 2 make: *** [all] Error 2 ``` what am i doing wrong and how can i solve this?

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