diff --git a/Makefile b/Makefile
index c94749c..f93063a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,7 @@
 PREFIX ?= /usr/local
-MAN_PREFIX ?= ${PREFIX}/man
+BINDIR ?= $(PREFIX)/bin
+MANDIR ?= $(PREFIX)/man
+SHAREDIR ?= $(PREFIX)/share
 
 .PHONY: all install test distrib
 
@@ -11,22 +13,22 @@ target/release/pizauth:
 PLATFORM=$(shell uname)
 
 install: target/release/pizauth
-	install -d ${PREFIX}/bin
-	install -c -m 555 target/release/pizauth ${PREFIX}/bin/pizauth
-	install -d ${MAN_PREFIX}/man1
-	install -d ${MAN_PREFIX}/man5
-	install -c -m 444 pizauth.1 ${MAN_PREFIX}/man1/pizauth.1
-	install -c -m 444 pizauth.conf.5 ${MAN_PREFIX}/man5/pizauth.conf.5
-	install -d ${PREFIX}/share/examples/pizauth
-	install -c -m 444 examples/pizauth.conf ${PREFIX}/share/examples/pizauth/pizauth.conf
-	install -d ${PREFIX}/share/pizauth/bash
-	install -c -m 444 share/bash/completion.bash ${PREFIX}/share/pizauth/bash/completion.bash
+	install -d ${DESTDIR}${BINDIR}
+	install -c -m 555 target/release/pizauth ${DESTDIR}${PREFIX}/bin/pizauth
+	install -d ${DESTDIR}${MANDIR}/man1
+	install -d ${DESTDIR}${MANDIR}/man5
+	install -c -m 444 pizauth.1 ${DESTDIR}${MANDIR}/man1/pizauth.1
+	install -c -m 444 pizauth.conf.5 ${DESTDIR}${MANDIR}/man5/pizauth.conf.5
+	install -d ${DESTDIR}${SHAREDIR}/examples/pizauth
+	install -c -m 444 examples/pizauth.conf ${DESTDIR}${SHAREDIR}/examples/pizauth/pizauth.conf
+	install -d ${DESTDIR}${SHAREDIR}/pizauth/bash
+	install -c -m 444 share/bash/completion.bash ${DESTDIR}${SHAREDIR}/pizauth/bash/completion.bash
 ifeq ($(PLATFORM), Linux)
-	install -d ${PREFIX}/lib/systemd/user
-	install -c -m 444 lib/systemd/user/pizauth.service ${PREFIX}/lib/systemd/user/pizauth.service
-	install -d ${PREFIX}/share/examples/pizauth/systemd-dropins
-	install -c -m 444 examples/systemd-dropins/age.conf ${PREFIX}/share/examples/pizauth/systemd-dropins/age.conf
-	install -c -m 444 examples/systemd-dropins/gpg-dump.conf ${PREFIX}/share/examples/pizauth/systemd-dropins/gpg-dump.conf
+	install -d ${DESTDIR}${PREFIX}/lib/systemd/user
+	install -c -m 444 lib/systemd/user/pizauth.service ${DESTDIR}${PREFIX}/lib/systemd/user/pizauth.service
+	install -d ${DESTDIR}${SHAREDIR}/examples/pizauth/systemd-dropins
+	install -c -m 444 examples/systemd-dropins/age.conf ${DESTDIR}${SHAREDIR}/examples/pizauth/systemd-dropins/age.conf
+	install -c -m 444 examples/systemd-dropins/gpg-dump.conf ${DESTDIR}${SHAREDIR}/examples/pizauth/systemd-dropins/gpg-dump.conf
 endif
 
 test: