CMake complains The CXX compiler identification is unknown

Question

I am following this thread and this one to build my own KDE without a sudo permission  Since there was no Git and CMake installed on the workstation  I just had them both installed under  home  lt  user  and added  home  lt  user  bin and  home  lt  user  lib to both PATH and LD LIBRARY PATH   Since KDE build only supports CMake  not configure  So I have to set the prefix via CMake  like this  cmake   kde-devel src kdelibs -DCMAKE INSTALL PREFIX  home  lt user gt   At this point I got below error    gt    bin cmake   kde-devel src kdelibs -DCMAKE INSTALL PREFIX  home  lt user gt  -- The CXX compiler identification is unknown -- Check for working CXX compiler   home gnu bin c   -- Check for working CXX compiler   home gnu bin c   -- broken CMake Error at  home  lt user gt  share cmake-2 8 Modules CMakeTestCXXCompiler cmake 45  MESSAGE     The C   compiler   home gnu bin c    is not able to compile a simple test   program     It fails with the following output      Change Dir   home  lt user gt  kde-devel build kdelibs CMakeFiles CMakeTmp      Run Build Command  usr bin gmake  cmTryCompileExec fast          I checked that there are 2 C   compilers    gt  where c    home gnu bin c    usr bin c     Should I set CMake default C   compiler to  usr bin c    and how  Or is there any way to fix this issue

User · Answer

Run apt-get install build-essential on your system   This package depends on other packages considered to be essential for builds and will install them   If you find you have to build packages  this can be helpful to avoid piecemeal resolution of dependencies   See this page for more info

User · Answer

Your  home gnu bin c   seem to require additional flag to link things properly and CMake doesn t know about that   To use  usr bin c   as your compiler run cmake with -DCMAKE CXX COMPILER  usr bin c     Also  CMAKE PREFIX PATH variable sets destination dir where your project  files should be installed  It has nothing to do with CMake installation prefix and CMake itself already know this

User · Answer

I just had this problem setting up my new laptop  The issue for me was that my toolchain  CodeSourcery  is 32bit and I had not installed the 32bit libs   sudo apt-get install ia32-libs

[linux] CMake complains "The CXX compiler identification is unknown"

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