Hi Experts Facing hard time to compile and install 5.1.0.Currently our system is already having gcc-4.4.7/g+-4.4.7 and need to upgrade it to 5.1.0 on rhel6.2.I have used below action plan but it,s failing with below errors.I tried multiple options with configuring gcc5.1.0 everytime same error. Any help is highly appreciated. Current System Info (rraiop)@dc2nix2d118>gcc -v Using built-in specs. Target: x86_64-redhat-linux Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre --enable-libgcj-multifile --enable-java-maintainer-mode --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib --with-ppl --with-cloog --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux Thread model: posix gcc version 4.4.7 20120313 (Red Hat 4.4.7-11) (GCC) (rraiop)@dc2nix2d118> (rraiop)@dc2nix2d118>g++ -v Using built-in specs. Target: x86_64-redhat-linux Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre --enable-libgcj-multifile --enable-java-maintainer-mode --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib --with-ppl --with-cloog --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux Thread model: posix gcc version 4.4.7 20120313 (Red Hat 4.4.7-11) (GCC) Action Plan Compile and Install gcc-5.1.0 on Linux server 1. Download all pre-requsite libraries and install them under /usr/local/<name> 1. Here they are 1. using yum: install gcc-c++ if it hasn.t been installed 2. download gmp: https://ftp.gnu.org/gnu/gmp/ get version 6.0.0 3. download mpfr http://www.mpfr.org/ get version 3.1.3 4. downlaod mpc http://www.multiprecision.org/. get version 1.0.3 5. download gcc http://gcc.gnu.org/releases.html get version 5.1.0 6. using yum install :yum install libstdc++-devel.i686 glibc-devel-i686; yum install zlib.i686;yum install zlib-devel.i686 zlib-devel* 7. Compile gmp - Uncompress and untar ( from #2) - Switch to dir ./configure --prefix=/usr/local/gmp6.0.0 make;make install ( if configure above returns no errors) 8. Compile mpfr - Uncompress and untar ( from #3) - Switch to dir ./configure --prefix=/usr/local/mpfr3.1.3 --with-gmp-include=/usr/local/gmp6.0.0/include --with-gmp-lib=/usr/local/gmp6.0.0/lib make;make install ( if configure above returns no errors) 9. Compile mpc - Uncompress and untar ( from #4) - Switch to dir ./configure --prefix=/usr/local/mpc1.0.3 --with-gmp-include=/usr/local/gmp6.0.0/include --with-gmp-lib=/usr/local/gmp6.0.0/lib --with-mpfr-include=/usr/local/mpfr3.1.3/include/ --with-mpfr-lib=/usr/local/mpfr3.1.3/lib/ make;make install ( if configure above returns no errors) 10. Export LD-LIBRARY_PATH export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/gmp6.0.0/lib:/usr/local/mpc1.0.3/lib:/usr/local/mpfr3.1.3/lib:/usr/local/isl0.14/lib:/usr/local/lib:/usr/local/lib64:/usr/lib:/usr/lib64 11. Configure gcc ./configure --prefix=/usr/local/gcc5.1.0 --with-isl-include=/usr/local/isl0.14/include --with-isl-lib=/usr/local/isl0.14/lib --with-gmp-include=/usr/local/gmp6.0.0/include --with-gmp-lib=/usr/local/gmp6.0.0/lib --with-mpfr-include=/usr/local/mpfr3.1.3/include --with-mpfr-lib=/usr/local/mpfr3.1.3/lib --with-mpc-include=/usr/local/mpc1.0.3/include --with-mpc-lib=/usr/local/mpc1.0.3/lib --disable-multilib --with-system-zlib --disable-bootstrap make;make install Error Truncated In file included from /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_algobase.h:71, from /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/char_traits.h:41, from /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/string:42, from ../.././gcc/system.h:201, from ../.././gcc/genmddeps.c:19: /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/debug/debug.h: At global scope: /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/debug/debug.h:47: error: expected constructor, destructor, or type conversion before ânamespaceâ In file included from /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/ostream_insert.h:36, from /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/string:46, from ../.././gcc/system.h:201, from ../.././gcc/genmddeps.c:19: /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/cxxabi-forced.h:29: error: expected declaration before end of line make[2]: *** [build/genmddeps.o] Error 1 make[2]: Leaving directory `/gcc/gcc-5.1.0/host-x86_64-unknown-linux-gnu/gcc' make[1]: *** [all-gcc] Error 2 make[1]: Leaving directory `/gcc/gcc-5.1.0' make: *** [all] Error 2 ............................................................................ 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