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CMake 未找到 SDL

tag-icon • tag-icon 16.04 compiling cmake sdl
CMake 未找到 SDL

我正在构建cmake使用 SDL 的应用程序。但此代码显示未找到 SDL：

find_package(SDL)
find_package(SDL_mixer)
find_package(SDL_image)
find_package(SDL_ttf)
...
if( SDL_FOUND STREQUAL "YES" )
    MESSAGE( STATUS "SDL FOUND: " ${SDL_INCLUDE_DIR} " : " ${SDL_LIBRARY} )
    link_directories( ${SDL_LIBRARY} )
else( SDL_FOUND STREQUAL "NO" )
    MESSAGE( STATUS "SDL NOT FOUND: " ${SDL_INCLUDE_DIR} " : " ${SDL_LIBRARY} )
endif( SDL_FOUND STREQUAL "YES" )

打印这个奇怪的消息：

-- SDL NOT FOUND: /usr/include/SDL : /usr/lib/x86_64-linux-gnu/libSDLmain.a/usr/lib/x86_64-linux-gnu/libSDL.so-lpthread

据我检查，/usr/include/SDL存在并包含所有必需的标头，并且库文件（.a和.so）位于/usr/lib/x86_64-linux-gnu。出了什么问题？

UPD：STREQUAL通过简单的布尔检查替换后，我可以看到它：

-- SDL FOUND: /usr/include/SDL : /usr/lib/x86_64-linux-gnu/libSDLmain.a/usr/lib/x86_64-linux-gnu/libSDL.so-lpthread
CMake Warning (dev) at CMakeLists.txt:55 (link_directories):
  This command specifies the relative path

    -lpthread

  as a link directory.

  Policy CMP0015 is not set: link_directories() treats paths relative to the
  source dir.  Run "cmake --help-policy CMP0015" for policy details.  Use the
  cmake_policy command to set the policy and suppress this warning.
This warning is for project developers.  Use -Wno-dev to suppress it.

但make失败了：

fatal error: SDL.h: No such file or directory

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