diff --git a/pkgs/applications/virtualization/OVMF/default.nix b/pkgs/applications/virtualization/OVMF/default.nix
index 9030799195bb..8435e824b843 100644
--- a/pkgs/applications/virtualization/OVMF/default.nix
+++ b/pkgs/applications/virtualization/OVMF/default.nix
@@ -274,6 +274,5 @@ edk2.mkDerivation projectDscPath (finalAttrs: {
       mjoerg
       sigmasquadron
     ];
-    broken = stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isAarch64;
   };
 })
diff --git a/pkgs/by-name/ac/acpica-tools/package.nix b/pkgs/by-name/ac/acpica-tools/package.nix
index 5cf7ae30268d..c6027ed0ae27 100644
--- a/pkgs/by-name/ac/acpica-tools/package.nix
+++ b/pkgs/by-name/ac/acpica-tools/package.nix
@@ -39,6 +39,13 @@ stdenv.mkDerivation (finalAttrs: {
       "-O3"
     ];
 
+    # ACPICA emits packed structs that produce unaligned pointers. Apple's
+    # arm64 linker rejects these under chained fixups; opt back into the
+    # legacy fixup format so the link succeeds.
+    NIX_LDFLAGS = lib.optionalString (
+      stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isAarch64
+    ) "-no_fixup_chains";
+
     # i686 builds fail with hardening enabled (due to -Wformat-overflow). Disable
     # -Werror altogether to make this derivation less fragile to toolchain
     # updates.
@@ -46,7 +53,7 @@ stdenv.mkDerivation (finalAttrs: {
 
     # We can handle stripping ourselves.
     # Unless we are on Darwin. Upstream makefiles degrade coreutils install to cp if _APPLE is detected.
-    INSTALLFLAGS = lib.optionals (!stdenv.hostPlatform.isDarwin) "-m 555";
+    INSTALLFLAGS = lib.optionalString (!stdenv.hostPlatform.isDarwin) "-m 555";
   };
 
   enableParallelBuilding = true;