emscripten

timan@timan-Rev-1-0:~/Downloads/cmake-2.8.3$ ./bootstrap 
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CMake 2.8.3, Copyright 2000-2009 Kitware, Inc.
C compiler on this system is: cc 
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Error when bootstrapping CMake:
Cannot find appropriate C++ compiler on this system.
Please specify one using environment variable CXX.
See cmake_bootstrap.log for compilers attempted.
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Log of errors: /home/timan/Downloads/cmake-2.8.3/Bootstrap.cmk/cmake_bootstrap.log
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timan@timan-Rev-1-0:~/Downloads/cmake-2.8.3$ sudo apt-get install gcc-c++
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package gcc-c+
E: Couldn't find any package by regex 'gcc-c+'
timan@timan-Rev-1-0:~/Downloads/cmake-2.8.3$ sudo apt-get install gcc-c++

why?

sudo apt-get build-essential g++

2.

/usr/bin/ld: final link failed: Bad value
collect2: error: ld returned 1 exit status
make[2]: *** [lib/libLTO.so] Error 1
make[1]: *** [tools/lto/CMakeFiles/LTO.dir/all] Error 2
make: *** [all] Error 2
Build failed due to exception!
Working directory: /home/qiaocy/Desktop/emsdk_portable/clang/fastcomp/build_master_64
Command '['make', '-j1']' returned non-zero exit status 2
Installation failed!