Installing with Homebrew on Mac Errors (El Capitan)

[jsuit]

I install with homebrew as readme said. But when I insert #include "json.hpp" into the top of my file, I get a long list of errors when I try to compile:

In file included from twitterClient.cpp:2:
/usr/local/include/json.hpp:118:12: error: unknown type name 'constexpr'
static constexpr bool value = sizeof(test(0)) == 1;

/usr/local/include/json.hpp:118:22: error: expected member name or ';' after
declaration specifiers
static constexpr bool value = sizeof(test(0)) == 1;

/usr/local/include/json.hpp:391:21: error: a space is required between
consecutive right angle brackets (use '> >')
basic_json>>>;
^
/usr/local/include/json.hpp:437:67: error: a space is required between
consecutive right angle brackets (use '> >')
using array_t = ArrayType<basic_json, AllocatorType<basic_json>>;
^
/usr/local/include/json.hpp:752:16: error: ISO C++ forbids forward references to
'enum' types
enum class value_t : uint8_t
^
/usr/local/include/json.hpp:753:5: error: expected '(' for function-style cast
or type construction
{
^
/usr/local/include/json.hpp:831:32: error: expected ';' at end of declaration
list
json_value(boolean_t v) noexcept : boolean(v) {}
^
/usr/local/include/json.hpp:942:16: error: ISO C++ forbids forward references to
'enum' types
enum class parse_event_t : uint8_t
^
/usr/local/include/json.hpp:943:5: error: expected '(' for function-style cast
or type construction
{
^
/usr/local/include/json.hpp:1087:41: error: expected ';' at end of declaration
list
basic_json(std::nullptr_t = nullptr) noexcept
^
/usr/local/include/json.hpp:2986:38: error: too many arguments provided to
function-like macro invocation
or std::is_same<array_t, pointee_t>::value
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__config:596:9: note:
macro 'static_assert' defined here

define static_assert(__b, __m) \

....

What is giving me these errors

[gregmarr]

Your compiler doesn't have C++11 support enabled.

[nlohmann]

You need to add -std=c++11 to your compiler flags (CXXFLAGS).

[nlohmann]

@jsuit Can we close this issue?