diff --git a/CMakeLists.txt b/CMakeLists.txt
index a16751e6..d06216ab 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,6 +11,7 @@ project(clang-uml)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_VERBOSE_MAKEFILE OFF)
+set(CMAKE_FIND_DEBUG_MODE OFF)
 
 #
 # clang-uml custom defines
@@ -44,7 +45,6 @@ include(AddLLVM)
 message(STATUS "Found LLVM ${LLVM_PACKAGE_VERSION}")
 message(STATUS "Using LLVMConfig.cmake in: ${LLVM_DIR}")
 message(STATUS "LLVM library dir: ${LLVM_LIBRARY_DIR}")
-link_directories(${LLVM_LIBRARY_DIR})
 
 if(LINK_LLVM_SHARED)
     set(LIBTOOLING_LIBS clang-cpp LLVM)
@@ -86,18 +86,25 @@ find_package(Threads REQUIRED)
 # Setup yaml-cpp
 #
 message(STATUS "Checking for yaml-cpp...")
-find_package(yaml-cpp REQUIRED)
+if(APPLE)
+find_package(PkgConfig)
+if(PKG_CONFIG_FOUND)
+    pkg_check_modules(YAML_CPP yaml-cpp)
+    find_path(YAML_CPP_INCLUDE_DIR
+            NAMES yaml.h
+	    PATHS ${YAML_CPP_INCLUDE_DIR} /usr/local/include/yaml-cpp)
+    find_library(YAML_CPP_LIBRARY
+            NAMES yaml-cpp
+	    PATHS ${YAML_CPP_LIBRARIES} /usr/local/lib)
+    set(YAML_CPP_LIBRARY_DIR /usr/local/lib)
+endif()
+else(APPLE)
+    find_package(yaml-cpp REQUIRED)
+endif(APPLE)
 
-#message(STATUS "Checking for libclang...")
-#set(LLVM_PREFERRED_VERSION 14.0.0)
-# Add
-#   -DLLVM_CONFIG_PATH=/path/to/llvm-config
-# to use custom LLVM version
-#find_package(LibClang REQUIRED)
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror -Wall -Wextra -std=c++17 -Wno-unused-parameter -Wno-unused-private-field")
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror -Wall -Wextra -std=c++17")
-
-message(STATUS "Using CMAKE_CXX_FLAGS: ${CMAKE_CXX_FLAGS}")
+link_directories(${LLVM_LIBRARY_DIR} ${YAML_CPP_LIBRARY_DIR})
 
 #
 # Setup thirdparty sources
@@ -119,16 +126,17 @@ if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
                     OUTPUT_VARIABLE GCC_STDDEF_INCLUDE)
     message(STATUS "FOUND GCC STDDEF INCLUDE ${GCC_STDDEF_INCLUDE}")
     include_directories(${GCC_STDDEF_INCLUDE})
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -I${GCC_STDDEF_INCLUDE} -Wno-unused-parameter")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -I${GCC_STDDEF_INCLUDE}")
 endif()
 
+message(STATUS "Using CMAKE_CXX_FLAGS: ${CMAKE_CXX_FLAGS}")
 
 #
 # Setup include directories
 #
 include_directories(${LLVM_INCLUDE_DIRS})
 include_directories(${CLANG_UML_INSTALL_INCLUDE_DIR})
-include_directories(${YAML_CPP_INCLUDE_DIR})
+include_directories(${YAML_CPP_INCLUDE_DIRS})
 include_directories(${UML_HEADERS_DIR})
 include_directories(${THIRDPARTY_HEADERS_DIR})
 include_directories(${PROJECT_SOURCE_DIR}/src/)
diff --git a/src/class_diagram/model/class.h b/src/class_diagram/model/class.h
index 3a6291c4..f1633a5b 100644
--- a/src/class_diagram/model/class.h
+++ b/src/class_diagram/model/class.h
@@ -108,9 +108,9 @@ private:
 namespace std {
 template <>
 struct hash<
-    std::reference_wrapper<const clanguml::class_diagram::model::class_>> {
+    std::reference_wrapper<clanguml::class_diagram::model::class_>> {
     std::size_t operator()(const std::reference_wrapper<
-        const clanguml::class_diagram::model::class_> &key) const
+        clanguml::class_diagram::model::class_> &key) const
     {
         using clanguml::common::id_t;
 
diff --git a/src/class_diagram/model/diagram.cc b/src/class_diagram/model/diagram.cc
index 7c6afe9f..1873ff3d 100644
--- a/src/class_diagram/model/diagram.cc
+++ b/src/class_diagram/model/diagram.cc
@@ -213,9 +213,9 @@ void diagram::get_parents(
     bool found_new{false};
     for (const auto &parent : parents) {
         for (const auto &pp : parent.get().parents()) {
-            const auto p = get_class(pp.id());
+            auto p = get_class(pp.id());
             if (p.has_value()) {
-                auto [it, found] = parents.emplace(p.value());
+                auto [it, found] = parents.emplace(std::ref(p.value()));
                 if (found)
                     found_new = true;
             }
diff --git a/src/common/model/diagram_filter.h b/src/common/model/diagram_filter.h
index e0e86e6c..8330519a 100644
--- a/src/common/model/diagram_filter.h
+++ b/src/common/model/diagram_filter.h
@@ -219,7 +219,7 @@ private:
                     cd, element.get().path().to_string());
 
                 while (parent.has_value()) {
-                    parents.emplace(std::ref(parent.value()));
+                    parents.emplace(parent.value());
                     parent = detail::get<ElementT, DiagramT>(
                         cd, parent.value().path().to_string());
                 }
diff --git a/src/common/model/package.h b/src/common/model/package.h
index 911fbab0..b113b36b 100644
--- a/src/common/model/package.h
+++ b/src/common/model/package.h
@@ -57,9 +57,9 @@ private:
 
 namespace std {
 template <>
-struct hash<std::reference_wrapper<const clanguml::common::model::package>> {
+struct hash<std::reference_wrapper<clanguml::common::model::package>> {
     std::size_t operator()(
-        const std::reference_wrapper<const clanguml::common::model::package>
+        const std::reference_wrapper<clanguml::common::model::package>
             &key) const
     {
         using clanguml::common::id_t;
diff --git a/src/common/model/source_file.h b/src/common/model/source_file.h
index 092e57b5..c8aeefba 100644
--- a/src/common/model/source_file.h
+++ b/src/common/model/source_file.h
@@ -144,9 +144,9 @@ template <> struct hash<clanguml::common::model::filesystem_path> {
 namespace std {
 template <>
 struct hash<
-    std::reference_wrapper<const clanguml::common::model::source_file>> {
+    std::reference_wrapper<clanguml::common::model::source_file>> {
     std::size_t operator()(
-        const std::reference_wrapper<const clanguml::common::model::source_file>
+        const std::reference_wrapper<clanguml::common::model::source_file>
             &key) const
     {
         using clanguml::common::id_t;
diff --git a/src/common/types.h b/src/common/types.h
index f25ad344..9a6b6ef0 100644
--- a/src/common/types.h
+++ b/src/common/types.h
@@ -115,6 +115,6 @@ template <typename T>
 using reference_vector = std::vector<std::reference_wrapper<T>>;
 
 template <typename T>
-using reference_set = std::unordered_set<std::reference_wrapper<const T>>;
+using reference_set = std::unordered_set<std::reference_wrapper<T>>;
 
 } // namespace clang::common
\ No newline at end of file
diff --git a/src/include_diagram/generators/plantuml/include_diagram_generator.cc b/src/include_diagram/generators/plantuml/include_diagram_generator.cc
index 0156c160..507b48da 100644
--- a/src/include_diagram/generators/plantuml/include_diagram_generator.cc
+++ b/src/include_diagram/generators/plantuml/include_diagram_generator.cc
@@ -103,7 +103,7 @@ void generator::generate(std::ostream &ostr) const
 
     // Generate files and folders
     util::for_each_if(
-        m_model, [this](const auto &f) { return true; },
+        m_model, [](const auto &f) { return true; },
         [this, &ostr](const auto &f) {
             generate(dynamic_cast<source_file &>(*f), ostr);
         });
diff --git a/src/util/util.cc b/src/util/util.cc
index 5ab820b8..b6c9eecf 100644
--- a/src/util/util.cc
+++ b/src/util/util.cc
@@ -253,9 +253,11 @@ bool starts_with(
             normal_prefix /= element;
     }
 
-    return std::search(normal_path.begin(), normal_path.end(),
-               normal_prefix.begin(),
-               normal_prefix.end()) == normal_path.begin();
+    auto normal_path_str = normal_path.string();
+    auto normal_prefix_str = normal_prefix.string();
+    return std::search(normal_path_str.begin(), normal_path_str.end(),
+               normal_prefix_str.begin(),
+               normal_prefix_str.end()) == normal_path_str.begin();
 }
 
 template <> bool starts_with(const std::string &s, const std::string &prefix)