diff --git a/mesonbuild/coredata.py b/mesonbuild/coredata.py
index eeeb8d1fedc1..f6eb659896e9 100644
--- a/mesonbuild/coredata.py
+++ b/mesonbuild/coredata.py
@@ -923,7 +923,7 @@ def update_project_options(self, options: 'MutableKeyedOptionDictType', subproje
                                  fatal=False)
 
         # Find any extranious keys for this project and remove them
-        for key in list(self.options.keys() - options.keys()):
+        for key in self.options.keys() - options.keys():
             if key.is_project() and key.subproject == subproject:
                 del self.options[key]
 
diff --git a/mesonbuild/utils/universal.py b/mesonbuild/utils/universal.py
index edb309f0d000..ce9afd96be27 100644
--- a/mesonbuild/utils/universal.py
+++ b/mesonbuild/utils/universal.py
@@ -168,8 +168,11 @@ class _VerPickleLoadable(Protocol):
 
 from glob import glob
 
-if getattr(sys, 'frozen', False) and hasattr(sys, '_MEIPASS'):
-    # using a PyInstaller bundle, e.g. the MSI installed executable
+if getattr(sys, 'frozen', False):
+    # Using e.g. a PyInstaller bundle, such as the MSI installed executable.
+    # It is conventional for freeze programs to set this attribute to indicate
+    # that the program is self hosted, and for example there is no associated
+    # "python" executable.
     python_command = [sys.executable, 'runpython']
 else:
     python_command = [sys.executable]
@@ -1587,7 +1590,7 @@ def Popen_safe_logged(args: T.List[str], msg: str = 'Called', **kwargs: T.Any) -
         mlog.debug(f'{msg}: `{join_args(args)}` -> {excp}')
         raise
 
-    rc, out, err = p.returncode, o.strip(), e.strip()
+    rc, out, err = p.returncode, o.strip() if o else None, e.strip() if e else None
     mlog.debug('-----------')
     mlog.debug(f'{msg}: `{join_args(args)}` -> {rc}')
     if out:
diff --git a/test cases/rust/12 bindgen/meson.build b/test cases/rust/12 bindgen/meson.build
index f31040ec7808..09cb02a6d319 100644
--- a/test cases/rust/12 bindgen/meson.build	
+++ b/test cases/rust/12 bindgen/meson.build	
@@ -105,9 +105,9 @@ if prog_bindgen.version().version_compare('>= 0.65')
     input : 'src/header3.h',
     output : 'header3.rs',
     output_inline_wrapper : 'header3.c',
-    include_directories : 'include',
+    include_directories : inc,
   )
-  c_inline_wrapper = static_library('c_wrapper', gen3[1])
+  c_inline_wrapper = static_library('c_wrapper', gen3[1], include_directories: inc)
 
   f = configure_file(
     input : 'src/main3.rs',