diff --git a/README.md b/README.md
index a1ccc21..c017f07 100644
--- a/README.md
+++ b/README.md
@@ -258,17 +258,11 @@ this:
 $ meson build --cross-file cross/macos-universal.txt && ninja -C build
 ```
 
-However, the resulting binary will be marked as loadable on macOS 11+
-only, even for Intel, which is probably not what you want (ideally the
-Intel slice would support older versions of the OS). A Makefile that
-handles this explicitly is also provided:
-
-```
-$ make -f otherbuilds/Makefile.macos-universal
-```
-
-This produces only a static library, but it's a universal binary that
-is compatible with macOS 10.7 onwards on the Intel side.
+Note that the universal cross file also sets the minimum OS version to
+the earliest supported macOS versions for both architectures. (Note
+that actual compatibility will also depend on how any dependent
+libraries have been compiled.)  You can edit this in the
+`cross/macos-universal.txt` file if you want a specific target.
 
 See "FFT and resampler selection" below for further build options.
 
@@ -284,7 +278,7 @@ commercial terms.
 Ensure the Xcode command-line tools are installed, and
 
 ```
-$ meson build_ios --cross-file cross/ios.txt && ninja -C build
+$ meson build_ios --cross-file cross/ios.txt && ninja -C build_ios
 ```
 
 The output files will be found in the `build_ios` directory.
@@ -292,7 +286,7 @@ The output files will be found in the `build_ios` directory.
 To build for the simulator,
 
 ```
-$ meson build_sim --cross-file cross/ios-simulator.txt && ninja -C build
+$ meson build_sim --cross-file cross/ios-simulator.txt && ninja -C build_sim
 ```
 
 The output files will be found in the `build_sim` directory.
diff --git a/cross/macos-universal.txt b/cross/macos-universal.txt
index 728980f..0242fa5 100644
--- a/cross/macos-universal.txt
+++ b/cross/macos-universal.txt
@@ -14,8 +14,8 @@ strip = 'strip'
 pkgconfig = 'pkg-config'
 
 [built-in options]
-c_args = ['-arch', 'arm64', '-arch', 'x86_64']
-cpp_args = ['-arch', 'arm64', '-arch', 'x86_64']
-cpp_link_args = ['-arch', 'arm64', '-arch', 'x86_64']
+c_args = ['-arch', 'arm64', '-arch', 'x86_64', '-mmacosx-version-min=10.7']
+cpp_args = ['-arch', 'arm64', '-arch', 'x86_64', '-stdlib=libc++', '-mmacosx-version-min=10.7']
+cpp_link_args = ['-arch', 'arm64', '-arch', 'x86_64', '-stdlib=libc++', '-mmacosx-version-min=10.7']
 
 
diff --git a/cross/macos-x86_64.txt b/cross/macos-x86_64.txt
index fb1a10d..64197a8 100644
--- a/cross/macos-x86_64.txt
+++ b/cross/macos-x86_64.txt
@@ -15,6 +15,6 @@ pkgconfig = 'pkg-config'
 
 [built-in options]
 c_args = ['-arch', 'x86_64']
-cpp_args = ['-arch', 'x86_64']
-cpp_link_args = ['-arch', 'x86_64']
+cpp_args = ['-arch', 'x86_64', '-stdlib=libc++']
+cpp_link_args = ['-arch', 'x86_64', '-stdlib=libc++']
 
diff --git a/meson.build b/meson.build
index 38b70e2..35700cd 100644
--- a/meson.build
+++ b/meson.build
@@ -327,31 +327,43 @@ if system == 'darwin'
     '-exported_symbols_list', meson.source_root() / 'vamp/vamp-plugin.list'
   ]
 
-  have_version_min = false
-  foreach arg: get_option('cpp_args')
-    if arg.contains('version-min')
-      have_version_min = true
-    endif
-  endforeach
-
   if architecture == 'aarch64'
     arch_flags += [
       '-arch', 'arm64',
     ]
-    if not have_version_min
-      arch_flags += [ '-mmacosx-version-min=11' ]
-    endif
   elif architecture == 'x86_64'
     arch_flags += [
       '-arch', 'x86_64',
     ]
-    if not have_version_min
-      arch_flags += [ '-mmacosx-version-min=10.13' ]
-    endif
   else # begin architecture != 'aarch64' or 'x86_64'
     error('Build for architecture ' + architecture + ' is not supported on this platform')
   endif # end architecture
 
+  have_version_min = false
+  foreach arg: get_option('cpp_args')
+    if arg.contains('version-min')
+      have_version_min = true
+      bits = arg.split('=')
+      if bits.length() > 1
+	config_summary += { 'Target OS': bits[1] + '+' }
+      else
+	config_summary += { 'Target OS': '(unknown)' }
+      endif
+    endif
+  endforeach
+
+  if not have_version_min
+    message('Using default minimum target OS version')
+    message('(consider specifying this in cross-file if earlier target is desired)')
+    if architecture == 'aarch64'
+      arch_flags += [ '-mmacosx-version-min=11' ]
+      config_summary += { 'Target OS': '11+' }
+    else 
+      arch_flags += [ '-mmacosx-version-min=10.13' ]
+      config_summary += { 'Target OS': '10.13+' }
+    endif
+  endif
+
 elif system == 'windows'
   feature_defines += ['-D_WIN32', '-DNOMINMAX', '-D_USE_MATH_DEFINES', '-DGETOPT_API=']
   if cpp.get_id() == 'msvc'