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CMake find_package cannot find my MinGW libjpeg

I am getting error: Could not find JPEG (missing: JPEG_LIBRARY JPEG_INCLUDE_DIR) when using

FIND_PACKAGE(JPEG REQUIRED)
IF(JPEG_FOUND)
  INCLUDE_DIRECTORIES(${JPEG_INCLUDE_DIR})
  TARGET_LINK_LIBRARIES(mpo ${JPEG_LIBRARIES})
ENDIF()

I have libjpeg installed under

C:\MinGW\
    |-lib\       for libjpeg.a
    |-include\   for jpeglib.h

Did I miss something? I am using MSYS Makefiles generator

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1 answer


You need to make sure CMake knows where to look for your libraries / headers. Some search modules provide a hint of where to look, it looks like FindJPEG.cmake does not.



  • You can specify the location of the JPEG lib by specifying JPEG_LIBRARY and JPEG_INCLUDE_DIR via -DJPEG_LIBRARY:PATH=C:/MinGW/lib/libjpeg.a -DJPEG_INCLUDE_DIR:PATH=C:/MinGW/include/

    when running cmake (or add these variables using CMake GUI)
  • You can add C: \ MinGW \ lib and C: \ MinGW \ include to the respective CMake environment variables (see http://www.cmake.org/Wiki/CMake_Useful_Variables#Environment_Variables )
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