diff --git a/GNUmakefile b/GNUmakefile
index e9fbf99..47310bf 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -7,6 +7,11 @@ ifeq ($(OS),Windows_NT)
 	EXE := $(PROG).exe
 else
 	EXE := $(PROG)
+ifeq ($(shell uname), Darwin)
+	INSTALLFLAGS :=
+else
+	INSTALLFLAGS := D
+endif
 endif
 
 ## install: installs awl
@@ -16,11 +21,11 @@ install:
 	$(GO) install $(GOFLAGS) .
 else
 install: all
-	install -Dm755 $(PROG) $(DESTDIR)$(PREFIX)/$(BIN)/$(PROG)
-	install -Dm644 doc/$(PROG).1 $(DESTDIR)$(MAN)/man1/$(PROG).1
-	gzip -9 $(DESTDIR)$(MAN)/man1/$(PROG).1
+	install -$(INSTALLFLAGS)m755 $(PROG) $(DESTDIR)$(PREFIX)/$(BIN)/$(PROG)
+	install -$(INSTALLFLAGS)m644 doc/$(PROG).1 $(DESTDIR)$(MAN)/man1/$(PROG).1
+	gzip -9f $(DESTDIR)$(MAN)/man1/$(PROG).1
 # completions need to go in one specific place :)
-	install -Dm644 completions/bash.bash $(DESTDIR)$(PREFIX)/$(SHARE)/bash-completion/completions/$(PROG)
-	install -Dm644 completions/fish.fish $(DESTDIR)$(PREFIX)/$(SHARE)/fish/vendor_completions.d/$(PROG).fish
-	install -Dm644 completions/zsh.zsh $(DESTDIR)$(PREFIX)/$(SHARE)/zsh/site-functions/_$(PROG)
+	install -$(INSTALLFLAGS)m644 completions/bash.bash $(DESTDIR)$(PREFIX)/$(SHARE)/bash-completion/completions/$(PROG)
+	install -$(INSTALLFLAGS)m644 completions/fish.fish $(DESTDIR)$(PREFIX)/$(SHARE)/fish/vendor_completions.d/$(PROG).fish
+	install -$(INSTALLFLAGS)m644 completions/zsh.zsh $(DESTDIR)$(PREFIX)/$(SHARE)/zsh/site-functions/_$(PROG)
 endif
diff --git a/Makefile b/Makefile
index 31c1c9e..ea8632f 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,7 @@ EXE := $(PROG)
 install: all
 	install -Dm755 $(PROG) $(DESTDIR)$(PREFIX)/$(BIN)/$(PROG)
 	install -Dm644 doc/$(PROG).1 $(DESTDIR)$(MAN)/man1/$(PROG).1
-	gzip -9 $(DESTDIR)$(MAN)/man1/$(PROG).1
+	gzip -9f $(DESTDIR)$(MAN)/man1/$(PROG).1
 # completions need to go in one specific place :)
 	install -Dm644 completions/bash.bash $(DESTDIR)$(PREFIX)$(SHARE)/bash-completion/completions/$(PROG)
 	install -Dm644 completions/fish.fish $(DESTDIR)$(PREFIX)$(SHARE)/fish/vendor_completions.d/$(PROG).fish