Problem to install gcc-c++ in fedora21 [closed]

asked 2015-05-19 00:10:17 -0600

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*Installation of gcc-c++ in fedora21 64 bit is failed!!! The terminal command and outputs are given below:-*

g++ --version bash: g++: command not found... Install package 'gcc-c++' to provide command 'g++'? [N/y] y

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Loading list of packages.... The following packages have to be downgraded: gcc-4.9.2-1.fc21.x86_64 Various compilers (C, C++, Objective-C, Java, ...) cpp-4.9.2-1.fc21.x86_64 The C Preprocessor libgomp-4.9.2-1.fc21.x86_64 GCC OpenMP v3.0 shared support library libstdc++-4.9.2-1.fc21.x86_64 GNU Standard C++ Library libstdc++-4.9.2-1.fc21.i686 GNU Standard C++ Library The following packages have to be installed: libstdc++-devel-4.9.2-1.fc21.x86_64 Header files and libraries for C++ development Proceed with changes? [N/y] y
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Testing changes... Failed to install packages: Error running transaction: package libstdc++-4.9.2-1.fc21.x86_64 (newer than libstdc++-4.9.2-6.fc21.x86_64) is already installed package libstdc++-4.9.2-1.fc21.x86_64 (newer than libstdc++-4.9.2-6.fc21.i686) is already installed package libgomp-4.9.2-1.fc21.x86_64 (newer than libgomp-4.9.2-6.fc21.x86_64) is already installed package cpp-4.9.2-1.fc21.x86_64 (newer than cpp-4.9.2-6.fc21.x86_64) is already installed package gcc-4.9.2-1.fc21.x86_64 (newer than gcc-4.9.2-6.fc21.x86_64) is already installed package libstdc++-4.9.2-1.fc21.i686 (newer than libstdc++-4.9.2-6.fc21.x86_64) is already installed package libstdc++-4.9.2-1.fc21.i686 (newer than libstdc++-4.9.2-6.fc21.i686) is already installed