diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1e3ac12c..21bf11b0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -55,7 +55,7 @@ if(${projectPrefix}IWYU)
         MAX_LINE_LENGTH 120
         NO_COMMENTS
     )
-    if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+    if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
         set(${projectPrefix}AS_SYSTEM_HEADERS ON)
     endif()
 endif()
diff --git a/conanfile.py b/conanfile.py
index 7bddf441..17b0d4e4 100644
--- a/conanfile.py
+++ b/conanfile.py
@@ -70,6 +70,12 @@ class UnitsConan(ConanFile):
             (compiler == "msvc" and (version == "19.3" or version >= "19.30") and compiler.cppstd == 23)
         return not std_support
 
+    @property
+    def _use_range_v3(self):
+        compiler = self.settings.compiler
+        version = Version(self.settings.compiler.version)
+        return ("clang" in compiler and compiler.libcxx == "libc++" and version < "14.0")
+
     def set_version(self):
         content = tools.load(os.path.join(self.recipe_folder, "src/CMakeLists.txt"))
         version = re.search(r"project\([^\)]+VERSION (\d+\.\d+\.\d+)[^\)]*\)", content).group(1)
@@ -79,9 +85,9 @@ class UnitsConan(ConanFile):
         compiler = self.settings.compiler
         version = Version(self.settings.compiler.version)
         if self._use_libfmt:
-            self.requires("fmt/8.0.1")
+            self.requires("fmt/8.1.1")
 
-        if compiler == "clang" and compiler.libcxx == "libc++" and version < "14.0":
+        if self._use_range_v3:
             self.requires("range-v3/0.11.0")
 
     def build_requirements(self):
@@ -100,6 +106,9 @@ class UnitsConan(ConanFile):
         elif compiler == "clang":
             if version < "12":
                 raise ConanInvalidConfiguration("mp-units requires at least clang++-12")
+        elif compiler == "apple-clang":
+            if version < "13":
+                raise ConanInvalidConfiguration("mp-units requires at least AppleClang 13")
         elif compiler == "Visual Studio":
             if version < "16":
                 raise ConanInvalidConfiguration("mp-units requires at least Visual Studio 16.9")
@@ -148,7 +157,7 @@ class UnitsConan(ConanFile):
         self.cpp_info.components["core"].requires = ["gsl-lite::gsl-lite"]
         if compiler == "Visual Studio":
             self.cpp_info.components["core"].cxxflags = ["/utf-8"]
-        elif compiler == "clang" and compiler.libcxx == "libc++":
+        if self._use_range_v3:
             self.cpp_info.components["core"].requires.append("range-v3::range-v3")
 
         # rest
diff --git a/docs/index.rst b/docs/index.rst
index 948b8df2..0cfb607f 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -21,6 +21,7 @@ with a permissive `MIT license <https://github.com/mpusz/units/blob/master/LICEN
     - gcc-10
     - clang-12
     - Visual Studio 16.9
+    - Apple clang 13
 
 .. toctree::
     :maxdepth: 2
diff --git a/docs/usage.rst b/docs/usage.rst
index 9f530020..bc289de5 100644
--- a/docs/usage.rst
+++ b/docs/usage.rst
@@ -9,6 +9,7 @@ Installation And Usage
   - gcc-10
   - clang-12
   - Visual Studio 16.9
+  - Apple clang 13
 
 Repository Structure and Dependencies
 -------------------------------------
diff --git a/src/cmake/CheckLibcxxInUse.cmake b/src/cmake/CheckLibcxxInUse.cmake
index 4e122acf..7335da5c 100644
--- a/src/cmake/CheckLibcxxInUse.cmake
+++ b/src/cmake/CheckLibcxxInUse.cmake
@@ -23,7 +23,7 @@
 cmake_minimum_required(VERSION 3.15)
 
 function(check_libcxx_in_use variable)
-    if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+    if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
         message(CHECK_START "Checking if libc++ is being used")
         list(APPEND CMAKE_MESSAGE_INDENT "  ")
 
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index a41e5bc3..31900e53 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -37,14 +37,14 @@ check_libcxx_in_use(${projectPrefix}LIBCXX)
 add_library(mp-units-core INTERFACE)
 target_compile_features(mp-units-core INTERFACE cxx_std_20)
 target_link_libraries(mp-units-core INTERFACE
-    gsl-lite::gsl-lite
+    gsl::gsl-lite
 )
 target_include_directories(mp-units-core ${unitsAsSystem} INTERFACE
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
     $<INSTALL_INTERFACE:include>
 )
 
-if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
     if(${projectPrefix}LIBCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "14")
         find_package(range-v3 CONFIG REQUIRED)
         target_link_libraries(mp-units-core INTERFACE range-v3::range-v3)
diff --git a/src/core/include/units/bits/derived_unit.h b/src/core/include/units/bits/derived_unit.h
index f65b2fdd..097a08c2 100644
--- a/src/core/include/units/bits/derived_unit.h
+++ b/src/core/include/units/bits/derived_unit.h
@@ -47,7 +47,7 @@ constexpr ratio inverse_if_negative(const ratio& r)
 template<Unit... Us, typename... Es>
 constexpr ratio derived_ratio(exponent_list<Es...>)
 {
-  return (... * inverse_if_negative<Es>(pow<detail::abs(Es::num)>(Us::ratio) / dimension_unit<typename Es::dimension>::ratio));
+  return (... * inverse_if_negative<Es>(pow<detail::abs(Es::num)>(Us::ratio / dimension_unit<typename Es::dimension>::ratio)));
 }
 
 template<DerivedDimension D, Unit... Us>
diff --git a/src/core/include/units/bits/external/hacks.h b/src/core/include/units/bits/external/hacks.h
index 1db8e7de..3826ae44 100644
--- a/src/core/include/units/bits/external/hacks.h
+++ b/src/core/include/units/bits/external/hacks.h
@@ -63,18 +63,13 @@
 #define UNITS_DIAGNOSTIC_IGNORE_UNREACHABLE UNITS_DIAGNOSTIC_IGNORE(4702)
 #endif
 
-#if UNITS_COMP_CLANG
-
-#include <ciso646>
 #if _LIBCPP_VERSION
 #define UNITS_LIBCXX _LIBCPP_VERSION
 #endif
 
-#endif
-
 #if UNITS_LIBCXX
 
-#if UNITS_COMP_CLANG == 12
+#if UNITS_LIBCXX < 13000
 
 #include <concepts/concepts.hpp>
 #include <range/v3/algorithm/lower_bound.hpp>
@@ -84,7 +79,7 @@
 #include <range/v3/iterator/concepts.hpp>
 #include <range/v3/range/concepts.hpp>
 
-#elif UNITS_COMP_CLANG == 13
+#elif UNITS_LIBCXX < 14000
 
 #include <range/v3/functional/comparisons.hpp>
 
@@ -115,7 +110,7 @@ concept default_constructible = constructible_from<T>;
 
 #elif UNITS_LIBCXX
 
-#if UNITS_COMP_CLANG == 12
+#if UNITS_LIBCXX < 13000
 
 // concepts
 using concepts::common_with;
@@ -228,7 +223,7 @@ constexpr bool in_range(T t) noexcept
         std::cmp_less_equal(t, std::numeric_limits<R>::max());
 }
 
-#elif UNITS_COMP_CLANG == 13
+#elif UNITS_LIBCXX < 14000
 
 using concepts::three_way_comparable;
 using concepts::three_way_comparable_with;
diff --git a/src/core/include/units/magnitude.h b/src/core/include/units/magnitude.h
index eed32e16..eb6278e4 100644
--- a/src/core/include/units/magnitude.h
+++ b/src/core/include/units/magnitude.h
@@ -363,16 +363,6 @@ concept Magnitude = detail::is_magnitude<T>;
 template<typename T>
 T get_value(Magnitude auto m) { return m.template value<T>; }
 
-/**
- * @brief  Convert any positive integer to a Magnitude.
- *
- * This will be the main way end users create Magnitudes.  They should rarely (if ever) create a magnitude<...> by
- * manually adding base powers.
- */
-template<ratio R>
-  requires (R.num > 0)
-constexpr Magnitude auto as_magnitude();
-
 /**
  * @brief  A base to represent pi.
  */
diff --git a/src/mp-unitsConfig.cmake b/src/mp-unitsConfig.cmake
index afe3f7a1..8b63a787 100644
--- a/src/mp-unitsConfig.cmake
+++ b/src/mp-unitsConfig.cmake
@@ -21,7 +21,7 @@
 # SOFTWARE.
 
 function(__check_libcxx_in_use variable)
-    if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+    if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
         message(CHECK_START "Checking if libc++ is being used")
         list(APPEND CMAKE_MESSAGE_INDENT "  ")
 
@@ -43,7 +43,7 @@ find_dependency(fmt)
 find_dependency(gsl-lite)
 
 # add range-v3 dependency only for clang + libc++
-if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
     __check_libcxx_in_use(__units_libcxx)
     if(__units_libcxx AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "14")
         find_dependency(range-v3)
diff --git a/test/unit_test/static/fps_test.cpp b/test/unit_test/static/fps_test.cpp
index 1eb7e541..74ddd60e 100644
--- a/test/unit_test/static/fps_test.cpp
+++ b/test/unit_test/static/fps_test.cpp
@@ -59,6 +59,10 @@ static_assert(100_q_ft2 / 10_q_ft == 10_q_ft);
 
 static_assert(detail::unit_text<dim_area, square_foot>() == basic_symbol_text("ft²", "ft^2"));
 
+// volume
+static_assert(1_q_yd * 1_q_yd * 1_q_yd == 1_q_yd3);
+static_assert(cubic_yard::ratio / cubic_foot::ratio == ratio(27));
+
 /* ************** DERIVED DIMENSIONS WITH NAMED UNITS **************** */
 
 // acceleration