diff --git a/CMakeLists.txt b/CMakeLists.txt
index 47b8262c..7f0ce80a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,16 +15,33 @@ set(CLANG_UML_INSTALL_BIN_DIR ${PROJECT_SOURCE_DIR}/bin)
 
 set(UML_HEADERS_DIR ${PROJECT_SOURCE_DIR}/src/uml)
 
-set(LLVM_PREFERRED_VERSION 12.0.0)
+option(LLVM_CONFIG_PATH "Path to custom llvm-config executable")
+
+if(LLVM_CONFIG_PATH)
+    set(LIBCLANG_LLVM_CONFIG_EXECUTABLE ${LLVM_CONFIG_PATH})
+endif(LLVM_CONFIG_PATH)
+
+message(STATUS "Checking for fmt...")
+find_package(fmt REQUIRED)
 
 message(STATUS "Checking for spdlog...")
 find_package(spdlog REQUIRED)
-add_definitions(-DSPDLOG_FMT_EXTERNAL)
+if(APPLE)
+    get_target_property(SPDLOG_INCLUDE_DIRS spdlog::spdlog_header_only INTERFACE_INCLUDE_DIRECTORIES)
+else(APPLE)
+    get_target_property(SPDLOG_INCLUDE_DIRS spdlog::spdlog INTERFACE_INCLUDE_DIRECTORIES)
+    add_definitions(-DSPDLOG_FMT_EXTERNAL)
+endif(APPLE)
+
 
 message(STATUS "Checking for yaml-cpp...")
 find_package(yaml-cpp REQUIRED)
 
 message(STATUS "Checking for libclang...")
+set(LLVM_PREFERRED_VERSION 12.0.0)
+# Add
+#   -DLLVM_CONFIG_PATH=/path/to/llvm-config
+# to use custom LLVM version
 find_package(LibClang REQUIRED)
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17 ${LIBCLANG_CXXFLAGS}")
@@ -47,6 +64,7 @@ if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
 endif()
 include_directories(${CLANG_UML_INSTALL_INCLUDE_DIR})
 include_directories(${YAML_CPP_INCLUDE_DIR})
+include_directories(${SPDLOG_INCLUDE_DIRS})
 include_directories(${UML_HEADERS_DIR})
 include_directories(${THIRDPARTY_HEADERS_DIR})
 include_directories(${THIRDPARTY_HEADERS_DIR}/cppast/include)
@@ -62,7 +80,13 @@ add_library(clang-umllib OBJECT ${SOURCES})
 
 add_executable(clang-uml ${MAIN_SOURCE_FILE})
 install(TARGETS clang-uml DESTINATION ${CLANG_UML_INSTALL_BIN_DIR})
-target_link_libraries(clang-uml ${LIBCLANG_LIBRARIES} ${YAML_CPP_LIBRARIES} spdlog::spdlog cppast clang-umllib)
+target_link_libraries(clang-uml ${LIBCLANG_LIBRARIES} ${YAML_CPP_LIBRARIES} fmt::fmt cppast clang-umllib)
+if(APPLE)
+    target_link_libraries(clang-uml spdlog::spdlog_header_only)
+else(APPLE)
+    target_link_libraries(clang-uml spdlog::spdlog)
+endif(APPLE)
+
 target_compile_features(clang-uml PRIVATE cxx_std_17)
 
 install(
diff --git a/Makefile b/Makefile
index 231f3eed..86f84643 100644
--- a/Makefile
+++ b/Makefile
@@ -22,6 +22,8 @@
 
 NUMPROC ?= $(shell nproc)
 
+LLVM_CONFIG_PATH ?=
+
 .PHONY: clean
 clean:
 	rm -rf debug release
@@ -29,12 +31,14 @@ clean:
 debug/CMakeLists.txt:
 	cmake -S . -B debug \
 		-DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
-		-DCMAKE_BUILD_TYPE=Debug
+		-DCMAKE_BUILD_TYPE=Debug \
+		-DLLVM_CONFIG_PATH=$(LLVM_CONFIG_PATH)
 
 release/CMakeLists.txt:
 	cmake -S . -B release \
 		-DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
-		-DCMAKE_BUILD_TYPE=Release
+		-DCMAKE_BUILD_TYPE=Release \
+		-DLLVM_CONFIG_PATH=$(LLVM_CONFIG_PATH)
 
 debug: debug/CMakeLists.txt
 	echo "Using ${NUMPROC} cores"
diff --git a/README.md b/README.md
index 858cb07b..c343dfb5 100644
--- a/README.md
+++ b/README.md
@@ -26,10 +26,14 @@ Main features supported so far include:
 
 ### Building from source
 Currently the only method to install `clang-uml` is from source. First make sure
-that you have the following dependencies installed (example for Ubuntu):
+that you have the following dependencies installed:
 
 ```bash
+# Ubuntu
 apt install ccache cmake libyaml-cpp-dev libfmt-dev libspdlog-dev clang-12 libclang-12-dev libclang-cpp12-dev
+
+# macos
+brew install ccache cmake llvm fmt spdlog yaml-cpp
 ```
 
 Then proceed with building the sources:
@@ -42,6 +46,9 @@ make submodules
 make release
 release/clang-uml --help
 
+# To build using a specific installed version of LLVM use:
+LLVM_CONFIG_PATH=/usr/bin/llvm-config-13 make release
+
 # Optionally
 make install
 # or
diff --git a/cmake/FindLibClang.cmake b/cmake/FindLibClang.cmake
index 670c8616..20d6e153 100644
--- a/cmake/FindLibClang.cmake
+++ b/cmake/FindLibClang.cmake
@@ -57,13 +57,13 @@ if (NOT LIBCLANG_LLVM_CONFIG_EXECUTABLE)
             find_program(LIBCLANG_LLVM_CONFIG_EXECUTABLE NAMES llvm-config PATHS "${BREW_LLVM_PATH}/bin")
         else ()
             set(llvm_config_names llvm-config)
-            foreach(major RANGE 12 3)
+            foreach(major RANGE 13 3)
                 list(APPEND llvm_config_names "llvm-config${major}" "llvm-config-${major}")
                 foreach(minor RANGE 9 0)
                     list(APPEND llvm_config_names "llvm-config${major}${minor}" "llvm-config-${major}.${minor}" "llvm-config-mp-${major}.${minor}")
                 endforeach ()
             endforeach ()
-            find_program(LIBCLANG_LLVM_CONFIG_EXECUTABLE NAMES ${llvm_config_names})
+            find_program(LIBCLANG_LLVM_CONFIG_EXECUTABLE NAMES ${llvm_config_names} PATHS /usr/bin)
         endif ()
     endif ()
     if (LIBCLANG_LLVM_CONFIG_EXECUTABLE)
diff --git a/src/class_diagram/visitor/translation_unit_visitor.cc b/src/class_diagram/visitor/translation_unit_visitor.cc
index 39cc4e61..2ce17a31 100644
--- a/src/class_diagram/visitor/translation_unit_visitor.cc
+++ b/src/class_diagram/visitor/translation_unit_visitor.cc
@@ -600,8 +600,10 @@ void translation_unit_visitor::process_field(
 
     auto &tr = cx::util::unreferenced(cppast::remove_cv(mv.type()));
 
+#ifndef __APPLE__
     LOG_DBG("Processing field {} with unreferenced type of kind {}", mv.name(),
         tr.kind());
+#endif
 
     if (tr.kind() == cppast::cpp_type_kind::builtin_t) {
         LOG_DBG("Builtin type found for field: {}", m.name());
@@ -1076,8 +1078,10 @@ bool translation_unit_visitor::find_relationships(const cppast::cpp_type &t_,
     const auto fn =
         cx::util::full_name(cppast::remove_cv(t_), ctx.entity_index(), false);
 
+#ifndef __APPLE__
     LOG_DBG("Finding relationships for type {}, {}, {}", cppast::to_string(t_),
         t_.kind(), fn);
+#endif
 
     relationship_t relationship_type = relationship_hint;
     const auto &t = cppast::remove_cv(cx::util::unreferenced(t_));
diff --git a/src/package_diagram/model/package.h b/src/package_diagram/model/package.h
index 451827a4..7f9ac088 100644
--- a/src/package_diagram/model/package.h
+++ b/src/package_diagram/model/package.h
@@ -31,7 +31,7 @@
 namespace clanguml::package_diagram::model {
 
 namespace detail {
-template <typename T, template <typename> class Container,
+template <typename T, template <typename, typename> class Container,
     typename Ptr = std::unique_ptr<T>>
 class package_trait {
 public:
@@ -104,8 +104,9 @@ public:
             packages_.end();
     }
 
-    typedef typename Container<Ptr>::iterator iterator;
-    typedef typename Container<Ptr>::const_iterator const_iterator;
+    typedef typename Container<Ptr, std::allocator<Ptr>>::iterator iterator;
+    typedef typename Container<Ptr, std::allocator<Ptr>>::const_iterator
+        const_iterator;
 
     inline iterator begin() noexcept { return packages_.begin(); }
     inline const_iterator cbegin() const noexcept { return packages_.cbegin(); }
@@ -113,7 +114,7 @@ public:
     inline const_iterator cend() const noexcept { return packages_.cend(); }
 
 protected:
-    Container<std::unique_ptr<T>> packages_;
+    Container<Ptr, std::allocator<Ptr>> packages_;
 };
 }
 
diff --git a/src/package_diagram/visitor/translation_unit_visitor.cc b/src/package_diagram/visitor/translation_unit_visitor.cc
index fe1e3f45..b16cd376 100644
--- a/src/package_diagram/visitor/translation_unit_visitor.cc
+++ b/src/package_diagram/visitor/translation_unit_visitor.cc
@@ -381,8 +381,10 @@ bool translation_unit_visitor::find_relationships(const cppast::cpp_type &t_,
 
     const auto fn_ns = cx::util::ns(cppast::remove_cv(t_), ctx.entity_index());
 
+#ifndef __APPLE__
     LOG_DBG("Finding relationships for type {}, {}, {}", cppast::to_string(t_),
         t_.kind(), fn);
+#endif
 
     relationship_t relationship_type = relationship_hint;
     const auto &t = cppast::remove_cv(cx::util::unreferenced(t_));
diff --git a/tests/t00006/t00006.cc b/tests/t00006/t00006.cc
index f1bd5d2e..8018dc67 100644
--- a/tests/t00006/t00006.cc
+++ b/tests/t00006/t00006.cc
@@ -1,3 +1,4 @@
+#include <array>
 #include <map>
 #include <vector>
 
diff --git a/tests/t00017/t00017.cc b/tests/t00017/t00017.cc
index d10162a4..92464186 100644
--- a/tests/t00017/t00017.cc
+++ b/tests/t00017/t00017.cc
@@ -1,3 +1,5 @@
+#include <utility>
+
 namespace clanguml {
 namespace t00017 {
 class A {
@@ -34,6 +36,15 @@ class K {
 };
 
 class R {
+    explicit R(int &some_int, C &cc, const E &ee, F &&ff, I *&ii)
+        : some_int_reference{some_int}
+        , c{cc}
+        , e{ee}
+        , f{std::move(ff)}
+        , i{ii}
+    {
+    }
+
 private:
     int some_int;
     int *some_int_pointer;
@@ -43,7 +54,7 @@ private:
     B *b;
     C &c;
     const D *d;
-    const E &e{};
+    const E &e;
     F &&f;
     G **g;
     H ***h;
diff --git a/tests/t00028/t00028.cc b/tests/t00028/t00028.cc
index 3a0eb8f2..ca55afb1 100644
--- a/tests/t00028/t00028.cc
+++ b/tests/t00028/t00028.cc
@@ -39,6 +39,11 @@ enum class F { one, two, three };
 
 /// \uml{note[right] R class note.}
 class R {
+    explicit R(C &c)
+        : ccc(c)
+    {
+    }
+
     A aaa;
 
     B *bbb;