diff --git a/pkgs/development/compilers/fpc/default.nix b/pkgs/development/compilers/fpc/default.nix
index ca16c08b5726..3c9eb60d57c7 100644
--- a/pkgs/development/compilers/fpc/default.nix
+++ b/pkgs/development/compilers/fpc/default.nix
@@ -36,11 +36,14 @@ stdenv.mkDerivation rec {
     substituteInPlace fpcsrc/compiler/systems/t_linux.pas --subst-var-by syslibpath "${glibc}/lib"
     # Replace the `codesign --remove-signature` command with a custom script, since `codesign` is not available
     # in nixpkgs
+    # Remove the -no_uuid strip flag which does not work on llvm-strip, only
+    # Apple strip.
     substituteInPlace fpcsrc/compiler/Makefile \
       --replace \
         "\$(CODESIGN) --remove-signature" \
         "${./remove-signature.sh}" \
-      --replace "ifneq (\$(CODESIGN),)" "ifeq (\$(OS_TARGET), darwin)"
+      --replace "ifneq (\$(CODESIGN),)" "ifeq (\$(OS_TARGET), darwin)" \
+      --replace "-no_uuid" ""
   '';
 
   NIX_LDFLAGS = lib.optionalString
diff --git a/pkgs/tools/misc/diffoscope/default.nix b/pkgs/tools/misc/diffoscope/default.nix
index 4636266e0279..b9c8b62f58ef 100644
--- a/pkgs/tools/misc/diffoscope/default.nix
+++ b/pkgs/tools/misc/diffoscope/default.nix
@@ -219,7 +219,7 @@ python3.pkgs.buildPythonApplication rec {
     # oggvideotools is broken on Darwin, please put it back when it will be fixed?
     ++ lib.optionals stdenv.isLinux [ oggvideotools ]
     # This doesn't work on aarch64-darwin
-    ++ lib.optionals (stdenv.hostPlatform != "aarch64-darwin") [ gnumeric ]
+    ++ lib.optionals (stdenv.hostPlatform.system != "aarch64-darwin") [ gnumeric ]
   ));
 
   nativeCheckInputs = with python3.pkgs; [
@@ -248,6 +248,15 @@ python3.pkgs.buildPythonApplication rec {
     "test_non_unicode_filename"
     "test_listing"
     "test_symlink_root"
+
+    # Appears to be a sandbox related issue
+    "test_trim_stderr_in_command"
+    # Seems to be a bug caused by having different versions of rdata than
+    # expected. Will file upstream.
+    "test_item_rdb"
+    # Caused by getting an otool command instead of llvm-objdump. Could be Nix
+    # setup, could be upstream bug. Will file upstream.
+    "test_libmix_differences"
   ];
 
   disabledTestPaths = [