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Error using mex
Undefined symbols for architecture x86_64:
  "leveldb::DB::Open(leveldb::Options const&, std::__1::basic_string<char,
  std::__1::char_traits<char>, std::__1::allocator<char> > const&, leveldb::DB**)", referenced
  from:
      (anonymous namespace)::Operation_new::operator()(int, mxArray_tag**, int, mxArray_tag
      const**) in LevelDB_.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)</code>

In file included from /usr/include/c++/4.8/type_traits:35:0,
                 from include/mexplus/mxtypes.h:10,
                 [...]
/usr/include/c++/4.8/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
[...]

g++ -c  -Iinclude -Ileveldb-1.18/include -I/usr/local/MATLAB/extern/include -I/usr/local/MATLAB/simulink/include -DMATLAB_MEX_FILE -std=c++11 -ansi -D_GNU_SOURCE -fPIC -fno-omit-frame-pointer -pthread  -DMX_COMPAT_32 -O -DNDEBUG  "src/LevelDB_.cc"

-> g++ -O -fPIC -pthread -shared -Wl,--version-script,/usr/local/MATLAB/extern/lib/glnxa64/mexFunction.map -Wl,--no-undefined -o  "+leveldb/private/LevelDB_.mexa64"  LevelDB_.o  leveldb-1.18/libleveldb.a -Wl,-rpath-link,/usr/local/MATLAB/bin/glnxa64 -L/usr/local/MATLAB/bin/glnxa64 -lmx -lmex -lmat -lm

/usr/bin/ld: leveldb-1.18/libleveldb.a(db_impl.o): relocation R_X86_64_32S against `_ZTVN7leveldb2DBE' can not be used when making a shared object; recompile with -fPIC
leveldb-1.18/libleveldb.a: error adding symbols: Bad value
collect2: error: ld returned 1 exit status
[...]

rm -f libleveldb.a