debian installation error
```
# cmake ..
-- The C compiler identification is GNU 4.9.2
-- The CXX compiler identification is GNU 4.9.2
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Found UV: /usr/lib/x86_64-linux-gnu/libuv.so  
-- Looking for syslog.h
-- Looking for syslog.h - found
-- Found mhd: /usr/include  
-- Configuring done
-- Generating done
-- Build files have been written to: /root/xmrig-proxy/build
root@user:~/xmrig-proxy/build# make
Scanning dependencies of target xmrig-proxy

[  2%] Building CXX object CMakeFiles/xmrig-proxy.dir/src/api/Api.cpp.o
In file included from /usr/include/c++/4.9/array:35:0,
                 from /root/xmrig-proxy/src/proxy/StatsData.h:29,
                 from /root/xmrig-proxy/src/api/ApiState.h:28,
                 from /root/xmrig-proxy/src/api/Api.cpp:28:
/usr/include/c++/4.9/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.
 #error This file requires compiler and library support for the \
  ^
/root/xmrig-proxy/src/api/Api.cpp:31:1: warning: identifier ‘nullptr’ is a keyword in C++11 [-Wc++0x-compat]
 ApiState *Api::m_state = nullptr;
 ^
In file included from /root/xmrig-proxy/src/api/ApiState.h:28:0,
                 from /root/xmrig-proxy/src/api/Api.cpp:28:
/root/xmrig-proxy/src/proxy/StatsData.h:87:30: warning: non-static data member initializers only available with -std=c++11 or -std=gnu++11
     double hashrate[5] { 0.0 };
                              ^
/root/xmrig-proxy/src/proxy/StatsData.h:88:10: error: ‘array’ in namespace ‘std’ does not name a template type
     std::array<uint64_t, 10> topDiff { { } };
          ^
/root/xmrig-proxy/src/proxy/StatsData.h:87:24: warning: extended initializer lists only available with -std=c++11 or -std=gnu++11
     double hashrate[5] { 0.0 };
                        ^
/root/xmrig-proxy/src/proxy/StatsData.h:87:30: warning: extended initializer lists only available with -std=c++11 or -std=gnu++11
     double hashrate[5] { 0.0 };
                              ^
/root/xmrig-proxy/src/proxy/StatsData.h: In member function ‘uint32_t StatsData::avgLatency() const’:
/root/xmrig-proxy/src/proxy/StatsData.h:70:9: warning: ‘auto’ changes meaning in C++11; please remove it [-Wc++0x-compat]
         auto v = latency;
         ^
/root/xmrig-proxy/src/proxy/StatsData.h:70:14: error: ‘v’ does not name a type
         auto v = latency;
              ^
/root/xmrig-proxy/src/proxy/StatsData.h:71:26: error: ‘v’ was not declared in this scope
         std::nth_element(v.begin(), v.begin() + calls / 2, v.end());
                          ^
/root/xmrig-proxy/src/api/Api.cpp: At global scope:
/root/xmrig-proxy/src/api/Api.cpp:31:26: error: ‘nullptr’ was not declared in this scope
 ApiState *Api::m_state = nullptr;
                          ^
/root/xmrig-proxy/src/api/Api.cpp: In static member function ‘static char* Api::get(const char*, int*)’:
/root/xmrig-proxy/src/api/Api.cpp:53:16: error: ‘nullptr’ was not declared in this scope
         return nullptr;
                ^
CMakeFiles/xmrig-proxy.dir/build.make:54: recipe for target 'CMakeFiles/xmrig-proxy.dir/src/api/Api.cpp.o' failed
make[2]: *** [CMakeFiles/xmrig-proxy.dir/src/api/Api.cpp.o] Error 1
CMakeFiles/Makefile2:60: recipe for target 'CMakeFiles/xmrig-proxy.dir/all' failed
make[1]: *** [CMakeFiles/xmrig-proxy.dir/all] Error 2
Makefile:76: recipe for target 'all' failed
make: *** [all] Error 2
```

```
# lsb_release -a
No LSB modules are available.
Distributor ID:	Debian
Description:	Debian GNU/Linux 8.9 (jessie)
Release:	8.9
Codename:	jessie
```
