diff --git a/.github/scripts/trailing-newlines.sh b/.github/scripts/trailing-newlines.sh
index 332e65280..5e4c7e8e5 100755
--- a/.github/scripts/trailing-newlines.sh
+++ b/.github/scripts/trailing-newlines.sh
@@ -1,8 +1,13 @@
 #!/bin/bash
 
-set -e
+set -eo pipefail
+
+# Checking version to force it fail the build if rg is not installed.
+# Because `set -e` does not work inside the subshell $()
+rg --version > /dev/null 2>&1
+
+files=$(rg -l '[^\n]\z' -g '!*.{png,svg,scss,json,sql}' || true)
 
-files=$(rg -l '[^\n]\z' -g '!*.{svg,scss,json,sql}' || true)
 if [ "$files" != "" ]; then
     echo "the following files are missing a newline on the last line:"
     echo $files
diff --git a/Makefile b/Makefile
index fdfa2c182..5ade34310 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ ifndef OS
 	OS := unknown
 endif
 
-ifeq ($(OS),Windows_NT)
+ifeq (${OS},Windows_NT)
 	ifndef ACTIVATE_SCRIPT
 		ACTIVATE_SCRIPT := pyenv/Scripts/activate
 	endif
diff --git a/pylib/Makefile b/pylib/Makefile
index c78af5bf4..a168d00dc 100644
--- a/pylib/Makefile
+++ b/pylib/Makefile
@@ -1,5 +1,19 @@
 SHELL := /bin/bash
 FIND := $(if $(wildcard /bin/find),/bin/find,/usr/bin/find)
+MYPY_ARGS :=
+
+ifndef OS
+	OS := unknown
+endif
+
+ifndef UNAME
+	UNAME := unknown
+endif
+
+# https://anki.tenderapp.com/discussions/beta-testing/1860-error-unused-type-ignore-comment
+ifneq (${OS},Windows_NT)
+	MYPY_ARGS := --warn-unused-ignores
+endif
 
 .SHELLFLAGS := -eu -o pipefail -c
 .DELETE_ON_ERROR:
@@ -33,7 +47,7 @@ PROTODEPS := $(wildcard ../proto/*.proto)
 
 .build/hooks: tools/genhooks.py tools/hookslib.py
 	python tools/genhooks.py
-	black anki/hooks.py
+	python -m black anki/hooks.py
 	@touch $@
 
 BUILD_STEPS := .build/run-deps .build/dev-deps .build/py-proto anki/buildinfo.py .build/hooks
@@ -47,7 +61,7 @@ check: $(BUILD_STEPS) .build/mypy .build/test .build/fmt .build/imports .build/l
 .PHONY: fix
 fix: $(BUILD_STEPS)
 	isort $(ISORTARGS)
-	black $(BLACKARGS)
+	python -m black $(BLACKARGS)
 
 .PHONY: clean
 clean:
@@ -59,7 +73,7 @@ clean:
 CHECKDEPS := $(shell ${FIND} anki tests -name '*.py' | grep -v buildinfo.py)
 
 .build/mypy: $(CHECKDEPS)
-	mypy anki
+	python -m mypy ${MYPY_ARGS} anki
 	@touch $@
 
 .build/test: $(CHECKDEPS)
@@ -67,7 +81,8 @@ CHECKDEPS := $(shell ${FIND} anki tests -name '*.py' | grep -v buildinfo.py)
 	@touch $@
 
 .build/lint: $(CHECKDEPS)
-	pylint -j 0 --rcfile=.pylintrc -f colorized --extension-pkg-whitelist=ankirspy anki tests setup.py
+	python -m pylint -j 0 --rcfile=.pylintrc -f colorized \
+		--extension-pkg-whitelist=ankirspy anki tests setup.py
 	@touch $@
 
 .build/imports: $(CHECKDEPS)
@@ -75,7 +90,7 @@ CHECKDEPS := $(shell ${FIND} anki tests -name '*.py' | grep -v buildinfo.py)
 	@touch $@
 
 .build/fmt: $(CHECKDEPS)
-	black --check $(BLACKARGS)
+	python -m black --check $(BLACKARGS)
 	@touch $@
 
 # Building
diff --git a/pylib/mypy.ini b/pylib/mypy.ini
index 4215061bb..6ad6b351b 100644
--- a/pylib/mypy.ini
+++ b/pylib/mypy.ini
@@ -7,7 +7,6 @@ check_untyped_defs = true
 disallow_untyped_decorators = True
 warn_redundant_casts = True
 warn_unused_configs = True
-warn_unused_ignores = True
 
 [mypy-win32file]
 ignore_missing_imports = True
diff --git a/pylib/tests/test_importing.py b/pylib/tests/test_importing.py
index fc90dcfe0..b563c1734 100644
--- a/pylib/tests/test_importing.py
+++ b/pylib/tests/test_importing.py
@@ -18,6 +18,15 @@ srcNotes = None
 srcCards = None
 
 
+def clear_tempfile(tf):
+    """ https://stackoverflow.com/questions/23212435/permission-denied-to-write-to-my-temporary-file """
+    try:
+        tf.close()
+        os.unlink(tf.name)
+    except:
+        pass
+
+
 def test_anki2_mediadupes():
     tmp = getEmptyCol()
     # add a note that references a sound
@@ -208,13 +217,15 @@ def test_tsv_tag_modified():
     n.addTag("four")
     deck.addNote(n)
 
-    with NamedTemporaryFile(mode="w") as tf:
+    # https://stackoverflow.com/questions/23212435/permission-denied-to-write-to-my-temporary-file
+    with NamedTemporaryFile(mode="w", delete=False) as tf:
         tf.write("1\tb\tc\n")
         tf.flush()
         i = TextImporter(deck, tf.name)
         i.initMapping()
         i.tagModified = "boom"
         i.run()
+        clear_tempfile(tf)
 
     n.load()
     assert n["Front"] == "1"
@@ -243,13 +254,15 @@ def test_tsv_tag_multiple_tags():
     n.addTag("five")
     deck.addNote(n)
 
-    with NamedTemporaryFile(mode="w") as tf:
+    # https://stackoverflow.com/questions/23212435/permission-denied-to-write-to-my-temporary-file
+    with NamedTemporaryFile(mode="w", delete=False) as tf:
         tf.write("1\tb\tc\n")
         tf.flush()
         i = TextImporter(deck, tf.name)
         i.initMapping()
         i.tagModified = "five six"
         i.run()
+        clear_tempfile(tf)
 
     n.load()
     assert n["Front"] == "1"
@@ -273,13 +286,15 @@ def test_csv_tag_only_if_modified():
     n["Left"] = "3"
     deck.addNote(n)
 
-    with NamedTemporaryFile(mode="w") as tf:
+    # https://stackoverflow.com/questions/23212435/permission-denied-to-write-to-my-temporary-file
+    with NamedTemporaryFile(mode="w", delete=False) as tf:
         tf.write("1,2,3\n")
         tf.flush()
         i = TextImporter(deck, tf.name)
         i.initMapping()
         i.tagModified = "right"
         i.run()
+        clear_tempfile(tf)
 
     n.load()
     assert n.tags == []
diff --git a/pylib/tests/test_stats.py b/pylib/tests/test_stats.py
index 7de3dc831..045983ac0 100644
--- a/pylib/tests/test_stats.py
+++ b/pylib/tests/test_stats.py
@@ -1,4 +1,5 @@
-# coding: utf-8
+#!/usr/bin/env python3
+# -*- coding: UTF-8 -*-
 
 import os
 import tempfile
@@ -34,6 +35,6 @@ def test_graphs():
     d = aopen(os.path.join(dir, "test.anki2"))
     g = d.stats()
     rep = g.report()
-    with open(os.path.join(dir, "test.html"), "w") as f:
+    with open(os.path.join(dir, "test.html"), "w", encoding="UTF-8") as f:
         f.write(rep)
     return
diff --git a/qt/Makefile b/qt/Makefile
index 82cd91292..9793e0cb8 100644
--- a/qt/Makefile
+++ b/qt/Makefile
@@ -1,5 +1,22 @@
 SHELL := /bin/bash
 FIND := $(if $(wildcard /bin/find),/bin/find,/usr/bin/find)
+MYPY_ARGS :=
+PYLINT_ARGS :=
+
+ifndef OS
+	OS := unknown
+endif
+
+ifndef UNAME
+	UNAME := unknown
+endif
+
+# https://anki.tenderapp.com/discussions/beta-testing/1860-error-unused-type-ignore-comment
+ifneq (${OS},Windows_NT)
+	MYPY_ARGS := --warn-unused-ignores
+else
+	PYLINT_ARGS := --ignored-modules=win32file,pywintypes,socket,win32pipe
+endif
 
 .SHELLFLAGS := -eu -o pipefail -c
 .DELETE_ON_ERROR:
@@ -42,7 +59,7 @@ TSDEPS := $(wildcard ts/src/*.ts) $(wildcard ts/scss/*.scss)
 
 .build/hooks: tools/genhooks_gui.py ../pylib/tools/hookslib.py
 	python tools/genhooks_gui.py
-	black aqt/gui_hooks.py
+	python -m black aqt/gui_hooks.py
 	@touch $@
 
 BUILD_STEPS := .build/run-deps .build/dev-deps .build/js .build/ui aqt/buildinfo.py .build/hooks .build/i18n
@@ -56,7 +73,7 @@ check: $(BUILD_STEPS) .build/mypy .build/test .build/fmt .build/imports .build/l
 .PHONY: fix
 fix: $(BUILD_STEPS)
 	isort $(ISORTARGS)
-	black $(BLACKARGS)
+	python -m black $(BLACKARGS)
 	(cd ts && npm run pretty)
 
 .PHONY: clean
@@ -80,7 +97,7 @@ PYLIB := ../pylib
 CHECKDEPS := $(shell ${FIND} aqt tests -name '*.py' | grep -v buildinfo.py)
 
 .build/mypy: $(CHECKDEPS) .build/qt-stubs
-	mypy aqt
+	python -m mypy ${MYPY_ARGS} aqt
 	@touch $@
 
 .build/test: $(CHECKDEPS)
@@ -88,7 +105,8 @@ CHECKDEPS := $(shell ${FIND} aqt tests -name '*.py' | grep -v buildinfo.py)
 	@touch $@
 
 .build/lint: $(CHECKDEPS)
-	pylint -j 0 --rcfile=.pylintrc -f colorized --extension-pkg-whitelist=PyQt5,ankirspy aqt tests setup.py
+	python -m pylint -j 0 --rcfile=.pylintrc -f colorized ${PYLINT_ARGS} \
+		--extension-pkg-whitelist=PyQt5,ankirspy aqt tests setup.py
 	@touch $@
 
 .build/imports: $(CHECKDEPS)
@@ -96,7 +114,7 @@ CHECKDEPS := $(shell ${FIND} aqt tests -name '*.py' | grep -v buildinfo.py)
 	@touch $@
 
 .build/fmt: $(CHECKDEPS)
-	black --check $(BLACKARGS)
+	python -m black --check $(BLACKARGS)
 	@touch $@
 
 .build/qt-stubs:
diff --git a/qt/aqt/main.py b/qt/aqt/main.py
index baf5c49f9..7e84f59aa 100644
--- a/qt/aqt/main.py
+++ b/qt/aqt/main.py
@@ -1462,8 +1462,8 @@ will be lost. Continue?"""
             # make sure ctypes is bundled
             from ctypes import windll, wintypes  # type: ignore
 
-            _dummy = windll
-            _dummy = wintypes
+            _dummy1 = windll
+            _dummy2 = wintypes
 
     def maybeHideAccelerators(self, tgt: Optional[Any] = None) -> None:
         if not self.hideMenuAccels:
diff --git a/qt/mypy.ini b/qt/mypy.ini
index 5d5a5ca40..a69375016 100644
--- a/qt/mypy.ini
+++ b/qt/mypy.ini
@@ -6,7 +6,6 @@ show_error_codes = true
 disallow_untyped_decorators = True
 warn_redundant_casts = True
 warn_unused_configs = True
-warn_unused_ignores = True
 
 [mypy-win32file]
 ignore_missing_imports = True
diff --git a/qt/po/scripts/copy-qt-files b/qt/po/scripts/copy-qt-files
index 0a8a7eb25..71218733a 100755
--- a/qt/po/scripts/copy-qt-files
+++ b/qt/po/scripts/copy-qt-files
@@ -14,4 +14,4 @@ case "${unameOut}" in
         ;;
 esac
 
-rsync -a "$qtTranslations"/qt* "$out"
+rsync -a "$qtTranslations/" "$out/"
diff --git a/qt/tools/typecheck-setup.sh b/qt/tools/typecheck-setup.sh
index 65311f07c..93cca0447 100755
--- a/qt/tools/typecheck-setup.sh
+++ b/qt/tools/typecheck-setup.sh
@@ -6,8 +6,21 @@
 # able to resolve. A solution that doesn't require modifying the python install
 # would be welcome!
 
-TOOLS="$(cd "`dirname "$0"`"; pwd)"
-modDir=$(python -c 'import PyQt5, sys, os; print(os.path.dirname(sys.modules["PyQt5"].__file__))')
-cmd="rsync -a $TOOLS/stubs/PyQt5/* $modDir/"
+set -eo pipefail
 
-$cmd > /dev/null 2>&1 || sudo $cmd
+TOOLS="$(cd "`dirname "$0"`"; pwd)"
+modDir=$(python -c 'import PyQt5, sys, os; sys.stdout.write(os.path.dirname(sys.modules["PyQt5"].__file__))')
+
+unameOut="$(uname -s)"
+case "${unameOut}" in
+    CYGWIN*)
+        modDir="$(cygpath -u "${modDir}")"
+        ;;
+esac
+
+if [[ "w${OS}" == "wWindows_NT" ]];
+then
+    rsync -a "${TOOLS}/stubs/PyQt5/" "${modDir}/"
+else
+    rsync -a "${TOOLS}/stubs/PyQt5/" "${modDir}/" || sudo rsync -a "${TOOLS}/stubs/PyQt5/" "${modDir}/"
+fi
diff --git a/rspy/Makefile b/rspy/Makefile
index 798a67515..49c5237b6 100644
--- a/rspy/Makefile
+++ b/rspy/Makefile
@@ -5,7 +5,7 @@ ifndef OS
 	OS := unknown
 endif
 
-ifeq ($(OS),Windows_NT)
+ifeq (${OS},Windows_NT)
 	ifndef PYTHON_BIN
 		PYTHON_BIN := python
 	endif