title: how to configure a c++ source build for c++11
body: <p>I am trying to make and install <a href="http://dist.svp-home.org/deploy/mgsim-3.5.41-3724f.tar.bz2" rel="nofollow">MGSim simulator</a> from source code. To do that I entered the following configuration command:<br>
  <code>[root@dhcppc2 build-mtalpha]# ../configure --target=mtalpha --disable-trace-checks --prefix=/home/mehdi/mgsim CXX=g++ CPPFLAGS=-std=c++0x</code></p>
  
  <p>I think I have enabled C++11 support by providing `c++0x' flag, but I still get the following error:   </p>
  
  <p><code>configure: error: *** A compiler with support for C++11 language features is required.</code></p>
  
  <p>I entered other alternatives for c++0x such as c++11, g++, gnu-0x, etc. but none worked.<br>
  The full configure output is <a href="http://pastebin.com/ZsKp6eXb" rel="nofollow">here</a>:</p>
  
  <pre><code>checking build system type... x86_64-unknown-linux-gnu
  checking host system type... x86_64-unknown-linux-gnu
  checking target system type... mtalpha-unknown-none
  checking for a BSD-compatible install... /usr/bin/install -c
  checking whether build environment is sane... yes
  checking for a thread-safe mkdir -p... /usr/bin/mkdir -p
  checking for gawk... gawk
  checking whether make sets $(MAKE)... yes
  checking whether make supports nested variables... yes
  checking whether UID '1000' is supported by ustar format... yes
  checking whether GID '1000' is supported by ustar format... yes
  checking how to create a ustar tar archive... gnutar
  checking whether make supports nested variables... (cached) yes
  checking for ranlib... ranlib
  checking for a sed that does not truncate output... /usr/bin/sed
  checking for a Python interpreter with version &gt;= 2.6... python
  checking for python... /usr/bin/python
  checking for python version... 2.7
  checking for python platform... linux2
  checking for python script directory... ${prefix}/lib/python2.7/site-packages
  checking for python extension module directory... ${exec_prefix}/lib64/python2.7/site-packages
  checking for help2man... no
  checking for rst2man... no
  checking for rst2man.py... no
  checking for tbl... tbl
  checking for groff... groff
  checking for ps2pdf... ps2pdf
  checking whether the C++ compiler works... yes
  checking for C++ compiler default output file name... a.out
  checking for suffix of executables...
  checking whether we are cross compiling... no
  checking for suffix of object files... o
  checking whether we are using the GNU C++ compiler... yes
  checking whether g++ accepts -g... yes
  checking for style of include used by make... GNU
  checking dependency style of g++... gcc3
  checking how to run the C++ preprocessor... g++ -E
  checking for grep that handles long lines and -e... /usr/bin/grep
  checking for egrep... /usr/bin/grep -E
  checking for ANSI C header files... yes
  checking for sys/types.h... yes
  checking for sys/stat.h... yes
  checking for stdlib.h... yes
  checking for string.h... yes
  checking for memory.h... yes
  checking for strings.h... yes
  checking for inttypes.h... yes
  checking for stdint.h... yes
  checking for unistd.h... yes
  checking minix/config.h usability... no
  checking minix/config.h presence... no
  checking for minix/config.h... no
  checking whether it is safe to define __EXTENSIONS__... yes
  checking whether the compiler supports GCC C++ ABI name demangling... yes
  checking whether g++ -std=gnu++11 supports range-based for loops... yes
  checking whether g++ -std=gnu++11 supports auto and decltype declarations... yes
  checking whether g++ -std=gnu++11 supports double right angle brackets in template uses (a&lt;b&lt;int&gt;&gt;)... yes
  checking whether g++ -std=gnu++11 supports initializer lists... yes
  checking whether g++ -std=gnu++11 supports static_assert... yes
  checking whether g++ -std=gnu++11 supports constructor reuse... yes
  checking whether g++ -std=gnu++11 supports move references... yes
  checking whether g++ -std=gnu++11 supports std::array... yes
  checking whether g++ -std=gnu++11 supports threads... no
  checking whether g++ -std=gnu++0x supports range-based for loops... yes
  checking whether g++ -std=gnu++0x supports auto and decltype declarations... yes
  checking whether g++ -std=gnu++0x supports double right angle brackets in template uses (a&lt;b&lt;int&gt;&gt;)... yes
  checking whether g++ -std=gnu++0x supports initializer lists... yes
  checking whether g++ -std=gnu++0x supports static_assert... yes
  checking whether g++ -std=gnu++0x supports constructor reuse... yes
  checking whether g++ -std=gnu++0x supports move references... yes
  checking whether g++ -std=gnu++0x supports std::array... yes
  checking whether g++ -std=gnu++0x supports threads... no
  checking whether g++ -std=c++11 supports range-based for loops... yes
  checking whether g++ -std=c++11 supports auto and decltype declarations... yes
  checking whether g++ -std=c++11 supports double right angle brackets in template uses (a&lt;b&lt;int&gt;&gt;)... yes
  checking whether g++ -std=c++11 supports initializer lists... yes
  checking whether g++ -std=c++11 supports static_assert... yes
  checking whether g++ -std=c++11 supports constructor reuse... yes
  checking whether g++ -std=c++11 supports move references... yes
  checking whether g++ -std=c++11 supports std::array... yes
  checking whether g++ -std=c++11 supports threads... no
  checking whether g++ -std=c++0x supports range-based for loops... yes
  checking whether g++ -std=c++0x supports auto and decltype declarations... yes
  checking whether g++ -std=c++0x supports double right angle brackets in template uses (a&lt;b&lt;int&gt;&gt;)... yes
  checking whether g++ -std=c++0x supports initializer lists... yes
  checking whether g++ -std=c++0x supports static_assert... yes
  checking whether g++ -std=c++0x supports constructor reuse... yes
  checking whether g++ -std=c++0x supports move references... yes
  checking whether g++ -std=c++0x supports std::array... yes
  checking whether g++ -std=c++0x supports threads... no
  configure: error: *** A compiler with support for C++11 language features is required.
  </code></pre>
  
  <p>The full configure log can be found <a href="http://pastebin.com/Z4GMxpu6" rel="nofollow">here</a>.</p>