diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index cee9946..5df8dc4 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,5 +1,8 @@
 name: build
-on: [push, pull_request]
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
 
 jobs:
   build:
@@ -8,18 +11,19 @@ jobs:
       - uses: actions/checkout@v2
       - name: install dependencies
         run: |
-          sudo apt-get install libboost-dev libboost-program-options-dev
+          sudo apt-get install -y --no-install-recommends libboost-dev libboost-program-options-dev
       - name: check code style
         run: |
           make lint
-          [[ $(git status --porcelain | tee >(cat 1>&2) | wc -l) -eq 0 ]]
+          git diff --exit-code
       - name: build and install
         run: |
           make
           sudo make install
+          sudo make uninstall
   debian:
     runs-on: ubuntu-20.04
-    container: debian:buster
+    container: debian:bullseye
     steps:
       - name: install tools
         run: |
@@ -33,7 +37,7 @@ jobs:
         run: |
           debian/nightly-changelog.sh
         env:
-          DISTRO: buster
+          DISTRO: bullseye
       - name: build package
         run: |
           debuild -us -uc
diff --git a/Makefile b/Makefile
index 56695aa..ef49033 100644
--- a/Makefile
+++ b/Makefile
@@ -1,23 +1,32 @@
 CXX ?= g++
+CXXFLAGS ?= -std=c++17 -Wall -Werror -Wno-error=deprecated-declarations -O2
 PREFIX ?= /usr/local
 DESTDIR ?=
 
+.PHONY: all
 all: infoconv infoedit
 
 infoconv: infoconv.cpp
-	$(CXX) -o infoconv -std=c++11 infoconv.cpp
+	$(CXX) $(CXXFLAGS) -o $@ $<
 
-infoedit: infoedit.hpp infoedit.cpp
-	$(CXX) -o infoedit -std=c++11 infoedit.cpp -lboost_program_options
+infoedit: infoedit.cpp infoedit.hpp
+	$(CXX) $(CXXFLAGS) -o $@ $< -lboost_program_options
 
+.PHONY: lint
 lint:
-	clang-format-8 -i -style=file *.[hc]pp
+	clang-format-11 -i -style=file *.[hc]pp
 
+.PHONY: clean
+clean:
+	rm -f infoconv infoedit
+
+.PHONY: install
 install: infoconv infoedit
 	install -d $(DESTDIR)$(PREFIX)/bin
 	install infoconv $(DESTDIR)$(PREFIX)/bin/infoconv
 	install infoedit $(DESTDIR)$(PREFIX)/bin/infoedit
 
+.PHONY: uninstall
 uninstall:
 	rm $(DESTDIR)$(PREFIX)/bin/infoconv
 	rm $(DESTDIR)$(PREFIX)/bin/infoedit