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The script will install GCC 5.4.0 on your CentOS 7 system, make sure you have root right. See for more details.
echo "Downloading gcc source files..."
curl -O
echo "extracting files..."
tar xvfj gcc-5.4.0.tar.bz2
echo "Installing dependencies..."
yum install gmp-devel mpfr-devel libmpc-devel -y
echo "Configure and install..."
mkdir gcc-5.4.0-build
cd gcc-5.4.0-build
../gcc-5.4.0/configure --enable-languages=c,c++ --disable-multilib
make -j$(nproc) && make install
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