diff --git a/flake.nix b/flake.nix
index a190efa..82ec1fb 100644
--- a/flake.nix
+++ b/flake.nix
@@ -182,7 +182,10 @@
             ++ darwinPkgs
             ++ linuxPkgs;
 
-          darwinPkgs = nixpkgs.lib.optionals stdenv.isDarwin (with pkgs.pkgsStatic; [libiconv]);
+          darwinPkgs = nixpkgs.lib.optionals stdenv.isDarwin (with pkgs.pkgsStatic; [
+            libiconv
+            apple-sdk_15
+          ]);
 
           linuxPkgs = nixpkgs.lib.optionals stdenv.isLinux (with pkgs;
             [
@@ -240,7 +243,7 @@
               };
             };
 
-            devShell = mkShell.override {inherit stdenv;} {
+            devShell = mkShell.override {inherit stdenv;} rec {
               packages =
                 [
                   alejandra
@@ -264,6 +267,11 @@
 
               LD_LIBRARY_PATH = "${lib.makeLibraryPath deps}";
               NIX_ENFORCE_NO_NATIVE = 0;
+              SDKROOT = lib.optionalString stdenv.isDarwin "${pkgs.pkgsStatic.apple-sdk_15}/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk";
+              NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-isysroot ${SDKROOT}";
+              NIX_CXXFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-isysroot ${SDKROOT}";
+              NIX_OBJCFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-isysroot ${SDKROOT}";
+              NIX_OBJCXXFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-isysroot ${SDKROOT}";
             };
           }
     );
diff --git a/meson.build b/meson.build
index a7ab820..703ee49 100644
--- a/meson.build
+++ b/meson.build
@@ -26,7 +26,6 @@ common_warning_flags = [
   '-Wno-c++20-extensions',
   '-Wno-c++98-compat',
   '-Wno-c++98-compat-pedantic',
-  '-Wno-covered-switch-default',
   '-Wno-disabled-macro-expansion',
   '-Wno-missing-prototypes',
   '-Wno-padded',
@@ -60,8 +59,7 @@ if host_system == 'darwin'
   add_languages('objcpp', native : false)
   objcpp = meson.get_compiler('objcpp')
   objcpp_flags = common_warning_flags + [
-    '-Wno-switch-default',
-    '-std=c++23',
+    '-std=c++26',
     '-fvisibility=hidden',
     '-fvisibility-inlines-hidden',
   ]