diff --git a/libs/audio/include/psemek/audio/duration.hpp b/libs/audio/include/psemek/audio/duration.hpp
index 2bf22ca1..36687149 100644
--- a/libs/audio/include/psemek/audio/duration.hpp
+++ b/libs/audio/include/psemek/audio/duration.hpp
@@ -26,7 +26,9 @@ namespace psemek::audio
 			: samples_{seconds_to_samples(seconds)}
 		{}
 
-		duration(duration const & other) = default;
+		duration(duration const & other)
+			: samples_{other.samples_}
+		{}
 
 		float seconds() const
 		{
@@ -38,6 +40,12 @@ namespace psemek::audio
 			return samples_;
 		}
 
+		duration & operator = (duration const & other)
+		{
+			samples_ = other.samples_;
+			return *this;
+		}
+
 		duration & operator += (duration const & other)
 		{
 			samples_ += other.samples_;
diff --git a/libs/audio/source/effect/fade_in.cpp b/libs/audio/source/effect/fade_in.cpp
index 777ecd7b..ea4c0384 100644
--- a/libs/audio/source/effect/fade_in.cpp
+++ b/libs/audio/source/effect/fade_in.cpp
@@ -1,7 +1,7 @@
 #include <psemek/audio/effect/fade_in.hpp>
 #include <psemek/audio/constants.hpp>
 
-#include <cmath>
+#include <algorithm>
 
 namespace psemek::audio
 {
diff --git a/libs/audio/source/effect/fade_out.cpp b/libs/audio/source/effect/fade_out.cpp
index 34440932..3137080d 100644
--- a/libs/audio/source/effect/fade_out.cpp
+++ b/libs/audio/source/effect/fade_out.cpp
@@ -1,7 +1,7 @@
 #include <psemek/audio/effect/fade_out.hpp>
 #include <psemek/audio/constants.hpp>
 
-#include <cmath>
+#include <algorithm>
 
 namespace psemek::audio
 {
diff --git a/libs/audio/source/effect/pause.cpp b/libs/audio/source/effect/pause.cpp
index d60453e0..fe57ff85 100644
--- a/libs/audio/source/effect/pause.cpp
+++ b/libs/audio/source/effect/pause.cpp
@@ -2,6 +2,7 @@
 #include <psemek/audio/detail/smooth.hpp>
 
 #include <atomic>
+#include <algorithm>
 
 namespace psemek::audio
 {
diff --git a/libs/audio/source/effect/truncate.cpp b/libs/audio/source/effect/truncate.cpp
index 2c98aa5e..d4b55ac4 100644
--- a/libs/audio/source/effect/truncate.cpp
+++ b/libs/audio/source/effect/truncate.cpp
@@ -1,5 +1,7 @@
 #include <psemek/audio/effect/truncate.hpp>
 
+#include <algorithm>
+
 namespace psemek::audio
 {
 
diff --git a/libs/audio/source/engine.cpp b/libs/audio/source/engine.cpp
index f8b47060..746a078b 100644
--- a/libs/audio/source/engine.cpp
+++ b/libs/audio/source/engine.cpp
@@ -29,7 +29,11 @@ namespace psemek::audio
 		channel_ptr output;
 
 		impl();
-		~impl();
+
+		~impl()
+		{
+			SDL_CloseAudioDevice(device);
+		}
 
 		static void callback(void * userdata, std::uint8_t * stream, int len);
 	};
@@ -54,11 +58,6 @@ namespace psemek::audio
 		SDL_PauseAudioDevice(device, 0);
 	}
 
-	engine::impl::~impl()
-	{
-		SDL_CloseAudioDevice(device);
-	}
-
 	void engine::impl::callback(void * userdata, std::uint8_t * dst_u8, int len)
 	{
 		static std::string const profiler_str = "audio";
diff --git a/libs/geom/include/psemek/geom/math.hpp b/libs/geom/include/psemek/geom/math.hpp
index 28660c95..b74dc013 100644
--- a/libs/geom/include/psemek/geom/math.hpp
+++ b/libs/geom/include/psemek/geom/math.hpp
@@ -3,6 +3,7 @@
 #include <psemek/geom/constants.hpp>
 
 #include <cmath>
+#include <algorithm>
 #include <optional>
 
 namespace psemek::geom
diff --git a/libs/gfx/source/gltf_mesh.cpp b/libs/gfx/source/gltf_mesh.cpp
index d69d691c..9def1b61 100644
--- a/libs/gfx/source/gltf_mesh.cpp
+++ b/libs/gfx/source/gltf_mesh.cpp
@@ -5,6 +5,7 @@
 #include <psemek/io/memory_stream.hpp>
 
 #include <stdexcept>
+#include <unordered_map>
 
 namespace psemek::gfx
 {
diff --git a/libs/phys/source/engine_3d.cpp b/libs/phys/source/engine_3d.cpp
index 1d9977f4..c3fa17e8 100644
--- a/libs/phys/source/engine_3d.cpp
+++ b/libs/phys/source/engine_3d.cpp
@@ -9,6 +9,9 @@
 #include <psemek/util/not_implemented.hpp>
 #include <psemek/util/unused.hpp>
 
+#include <vector>
+#include <array>
+
 namespace psemek::phys3d
 {
 
diff --git a/libs/util/include/psemek/util/enum.hpp b/libs/util/include/psemek/util/enum.hpp
index 46b98be0..6ba649e5 100644
--- a/libs/util/include/psemek/util/enum.hpp
+++ b/libs/util/include/psemek/util/enum.hpp
@@ -110,6 +110,6 @@ namespace psemek::util
 	} \
 	template <typename Char, typename Traits> \
 	inline ::std::basic_ostream<Char, Traits> & operator << (::std::basic_ostream<Char, Traits> & os, name value) { return os << to_string(value); } \
-	inline ::psemek::util::enum_range<name> BOOST_PP_CAT(name, _values) () { return {0, BOOST_PP_SEQ_SIZE(values)}; }
+	inline ::psemek::util::enum_range<name> BOOST_PP_CAT(name, _values) () { return {{0}, {BOOST_PP_SEQ_SIZE(values)}}; }
 
 
diff --git a/libs/util/include/psemek/util/hstring.hpp b/libs/util/include/psemek/util/hstring.hpp
index 7a9775ab..57a0d18f 100644
--- a/libs/util/include/psemek/util/hstring.hpp
+++ b/libs/util/include/psemek/util/hstring.hpp
@@ -60,7 +60,19 @@ namespace psemek::util
 
 	inline auto operator <=> (hstring const & str1, hstring const & str2)
 	{
+#ifdef __clang__
+		// libc++ in MacOSX12.3.sdk doesn't have operator <=> for string views
+		auto view1 = str1.view();
+		auto view2 = str2.view();
+		if (std::lexicographical_compare(view1.begin(), view1.end(), view2.begin(), view2.end()))
+			return std::strong_ordering::less;
+		else if (std::equal(view1.begin(), view1.end(), view2.begin(), view2.end()))
+			return std::strong_ordering::equal;
+		else
+			return std::strong_ordering::greater;
+#else
 		return str1.view() <=> str2.view();
+#endif
 	}
 
 }
diff --git a/libs/util/source/open_url.cpp b/libs/util/source/open_url.cpp
index fb0b3732..2af6098f 100644
--- a/libs/util/source/open_url.cpp
+++ b/libs/util/source/open_url.cpp
@@ -6,7 +6,7 @@
 namespace psemek::util
 {
 
-	static void ignore(int) {}
+	[[maybe_unused]] static void ignore(int) {}
 
 	static void do_open_url(std::string url)
 	{