diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index e0edae9..b27a466 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -8,7 +8,7 @@ on:
 
 env:
   # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
-  BUILD_TYPE: Release
+  BUILD_TYPE: Debug
 
 jobs:
   build:
@@ -22,12 +22,12 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Install dependencies
-      run: brew install rapidjson llvm
+      run: brew install rapidjson llvm@11
       
     - name: Configure CMake
       # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
       # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type
-      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DCMAKE_PREFIX_PATH=$(brew --prefix llvm)
+      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DCMAKE_PREFIX_PATH=$(brew --prefix llvm@11)
 
     - name: Build
       # Build your program with the given configuration
diff --git a/README.md b/README.md
index 3058700..998184b 100644
--- a/README.md
+++ b/README.md
@@ -9,103 +9,18 @@ Initial idea picked up from this conference by Sergiy Migdalskiy: https://archiv
 
 ## Requirements
 
-- Llvm 11
+- MacOS
+- Llvm 11 - Llvm 12 is not supported
 - RapidJson 1.x
 
 You might need to give the path to the llvm folder to CMake:
 ```bash
+brew install llvm@11 rapidjson ninja
 mkdir builds && cd builds
-cmake .. -G Ninja -DCMAKE_PREFIX_PATH=<your_path_to_llvm_install>
+cmake .. -G Ninja -DCMAKE_PREFIX_PATH=$(brew --prefix llvm@11)
 ninja
 ```
-With brew you can print the path using:
-```bash
-brew --prefix llvm
-```
-```bash
-cmake .. -G Ninja -DCMAKE_PREFIX_PATH="$(brew --prefix llvm)"
-```
-
-## Example
-File test_example.hpp:
-```c++
-#ifndef CPP2JSON_TEST_EXAMPLE_HPP
-#define CPP2JSON_TEST_EXAMPLE_HPP
-#include <string>
-
-struct Example01
-{
-    float m_float;
-    std::string m_string;
-    int m_int;
-};
 
-#endif //CPP2JSON_TEST_EXAMPLE_HPP
-```
-
-Run cpp2json on it:
-```bash
-$> cpp2json test_example.hpp --pretty --
-```
-
-Will give you the following JSON output:
-```json
-{
-    "classes": {
-        "Example01": {
-            "fields": [
-                {
-                    "name": "m_float",
-                    "type": {
-                        "key": "float",
-                        "expression": "float",
-                        "pointer": false,
-                        "array": false,
-                        "reference": false,
-                        "const": false,
-                        "volatile": false,
-                        "literal": true,
-                        "enum": false
-                    }
-                },
-                {
-                    "name": "m_string",
-                    "type": {
-                        "key": "std::string",
-                        "expression": "std::string",
-                        "pointer": false,
-                        "array": false,
-                        "reference": false,
-                        "const": false,
-                        "volatile": false,
-                        "literal": false,
-                        "enum": false
-                    }
-                },
-                {
-                    "name": "m_int",
-                    "type": {
-                        "key": "int",
-                        "expression": "int",
-                        "pointer": false,
-                        "array": false,
-                        "reference": false,
-                        "const": false,
-                        "volatile": false,
-                        "literal": true,
-                        "enum": false
-                    }
-                }
-            ],
-            "methods": [],
-            "annotations": [],
-            "bases": [],
-            "file": "/Users/iota/projects/tools/cpp2json/sources/tests/resources/test_example.hpp"
-        }
-    },
-    "enums": {}
-}
-```
 ## Usage
 ```bash
 USAGE: cpp2json [options] <source0> [... <sourceN>]
diff --git a/sources/core/src/CommandLineHelpers.cpp b/sources/core/src/CommandLineHelpers.cpp
index d622eb2..883273b 100644
--- a/sources/core/src/CommandLineHelpers.cpp
+++ b/sources/core/src/CommandLineHelpers.cpp
@@ -4,8 +4,11 @@ static std::string const LlvmBasePath{LLVM_DIR};
 
 clang::tooling::CommandLineArguments makeLlvmIncludeArguments()
 {
+    assert( !LlvmBasePath.empty() );
+
     std::string const llvmVersion = LlvmBasePath.substr(LlvmBasePath.find_last_of('/'));
     clang::tooling::CommandLineArguments extraArguments{
+        "-std=c++14",
         "-I" + LlvmBasePath + "/include/c++/v1",
         "-I" + LlvmBasePath + "/lib/clang/" + llvmVersion + "/include",
     };
diff --git a/sources/tests/Cpp2JsonVisitorFixture.cpp b/sources/tests/Cpp2JsonVisitorFixture.cpp
index 48765f4..52c5ee9 100644
--- a/sources/tests/Cpp2JsonVisitorFixture.cpp
+++ b/sources/tests/Cpp2JsonVisitorFixture.cpp
@@ -54,7 +54,8 @@ rapidjson::Value::ConstObject Cpp2JsonVisitorFixture::getField(std::string const
             return field;
         }
     }
-    assert(false);
+
+    throw std::runtime_error("field not found");
 }
 
 rapidjson::Value::ConstArray Cpp2JsonVisitorFixture::getFieldsOf(const std::string &className) const