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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"ZLib Linking error","articleBody":"Hi,\n\nI am currently trying to build the FIFEngine tutorial, but I am getting stuck at the following error:\n\n```\nsromer@ubuntu:~/Development/cpp-tutorials/src/_build$ cmake ..\n-- The C compiler identification is GNU 5.4.0\n-- The CXX compiler identification is GNU 5.4.0\n-- Check for working C compiler: /usr/bin/cc\n-- Check for working C compiler: /usr/bin/cc -- works\n-- Detecting C compiler ABI info\n-- Detecting C compiler ABI info - done\n-- Detecting C compile features\n-- Detecting C compile features - done\n-- Check for working CXX compiler: /usr/bin/c++\n-- Check for working CXX compiler: /usr/bin/c++ -- works\n-- Detecting CXX compiler ABI info\n-- Detecting CXX compiler ABI info - done\n-- Detecting CXX compile features\n-- Detecting CXX compile features - done\n-- Set CMAKE_BUILD_TYPE to default 'Release'.\n\n== Building fife-cpp-tutorials using build type 'Release'.\n--     Source directory is '/home/sromer/Development/cpp-tutorials/src'.\n--     Build  directory is '/home/sromer/Development/cpp-tutorials/src/_build'.\n--     Installation path is '/usr/local' (set -DCMAKE_INSTALL_PREFIX=\u003cpath\u003e to change).\n--     CXX Compiler Flags: ''.\n--     Dependencies folder: '/home/sromer/Development/cpp-tutorials/src/../dependencies'.\n\n-- Looking for XOpenDisplay in /usr/lib/x86_64-linux-gnu/libX11.so;/usr/lib/x86_64-linux-gnu/libXext.so\n-- Looking for XOpenDisplay in /usr/lib/x86_64-linux-gnu/libX11.so;/usr/lib/x86_64-linux-gnu/libXext.so - found\n-- Looking for gethostbyname\n-- Looking for gethostbyname - found\n-- Looking for connect\n-- Looking for connect - found\n-- Looking for remove\n-- Looking for remove - found\n-- Looking for shmat\n-- Looking for shmat - found\n-- Looking for IceConnectionNumber in ICE\n-- Looking for IceConnectionNumber in ICE - found\n-- Found X11: /usr/lib/x86_64-linux-gnu/libX11.so\n-- Found FIFE: /usr/local/lib/libfife.a (found version \"0.4.0\") \n-- Found the following FifeChan libraries:\n--   fifechan_opengl\n--   fifechan_sdl\n-- Found FIFECHAN: /usr/local/lib/libfifechan.so   \n-- Boost version: 1.58.0\n-- Found the following Boost libraries:\n--   system\n--   filesystem\n--   regex\n-- Found VORBIS: /usr/lib/x86_64-linux-gnu/libvorbisfile.so  \n-- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version \"1.2.8\") \n-- Found PNG: /usr/lib/x86_64-linux-gnu/libpng.so (found version \"1.2.54\") \n-- Found OGG: /usr/lib/x86_64-linux-gnu/libogg.so  \n\u003cFindSDL2.cmake\u003e\n-- Looking for pthread.h\n-- Looking for pthread.h - found\n-- Looking for pthread_create\n-- Looking for pthread_create - not found\n-- Looking for pthread_create in pthreads\n-- Looking for pthread_create in pthreads - not found\n-- Looking for pthread_create in pthread\n-- Looking for pthread_create in pthread - found\n-- Found Threads: TRUE  \n\u003c/FindSDL2.cmake\u003e\n-- Found SDL2: /usr/lib/x86_64-linux-gnu/libSDL2main.a;/usr/lib/x86_64-linux-gnu/libSDL2.so;-lpthread  \n-- Found SDL2_image: /usr/lib/x86_64-linux-gnu/libSDL2_image.so (found version \"2.0.1\") \n-- Found SDL2_ttf: /usr/lib/x86_64-linux-gnu/libSDL2_ttf.so (found version \"2.0.14\") \n-- Found OpenAL: /usr/lib/x86_64-linux-gnu/libopenal.so  \n-- Found OpenGL: /usr/lib/x86_64-linux-gnu/libGL.so  \n-- Found TinyXML: /usr/lib/x86_64-linux-gnu/libtinyxml.so  \n-- Configuring done\n-- Generating done\n-- Build files have been written to: /home/sromer/Development/cpp-tutorials/src/_build\nsromer@ubuntu:~/Development/cpp-tutorials/src/_build$ make\nScanning dependencies of target Tutorial1\n[ 14%] Building CXX object tutorial_1/CMakeFiles/Tutorial1.dir/MouseListener.cpp.o\n[ 28%] Building CXX object tutorial_1/CMakeFiles/Tutorial1.dir/ScreenScroller.cpp.o\n[ 42%] Building CXX object tutorial_1/CMakeFiles/Tutorial1.dir/Game.cpp.o\n[ 57%] Building CXX object tutorial_1/CMakeFiles/Tutorial1.dir/main.cpp.o\n[ 71%] Building CXX object tutorial_1/CMakeFiles/Tutorial1.dir/KeyListener.cpp.o\n[ 85%] Building CXX object tutorial_1/CMakeFiles/Tutorial1.dir/ViewController.cpp.o\n[100%] Linking CXX executable Tutorial1\n/usr/bin/ld: /usr/local/lib/libfife.a(zipsource.cpp.o): undefined reference to symbol 'inflateInit2_'\n/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libz.so: error adding symbols: DSO missing from command line\ncollect2: error: ld returned 1 exit status\ntutorial_1/CMakeFiles/Tutorial1.dir/build.make:268: recipe for target 'tutorial_1/Tutorial1' failed\nmake[2]: *** [tutorial_1/Tutorial1] Error 1\nCMakeFiles/Makefile2:85: recipe for target 'tutorial_1/CMakeFiles/Tutorial1.dir/all' failed\nmake[1]: *** [tutorial_1/CMakeFiles/Tutorial1.dir/all] Error 2\nMakefile:127: recipe for target 'all' failed\nmake: *** [all] Error 2\n```\n\nI figured libz.so might be missing from my system, but as you can see, CMake is able to find the libz library correctly: `Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version \"1.2.8\")`. I have checked if the library is indeed installed and can be found/accessed at the folder in which CMake locates libz and that is the case.\n\nI am running Ubuntu 16.04 LTS (x64).\n\nHopefully someone can help me out!\n","author":{"url":"https://github.com/sromer","@type":"Person","name":"sromer"},"datePublished":"2016-10-24T10:33:44.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":12},"url":"https://github.com/19/cpp-tutorials/issues/19"}