diff -uNr dma-0.10.orig/Makefile dma-0.10/Makefile
--- dma-0.10.orig/Makefile	2015-09-26 06:45:29.000000000 +0900
+++ dma-0.10/Makefile	2015-12-27 21:06:56.838022791 +0900
@@ -50,8 +50,8 @@
 install: all
 	${INSTALL} -d ${DESTDIR}${SBIN}
 	${INSTALL} -d ${DESTDIR}${MAN}/man8 ${DESTDIR}${LIBEXEC}
-	${INSTALL} -m 2755 -o root -g mail dma ${DESTDIR}${SBIN}
-	${INSTALL} -m 4754 -o root -g mail dma-mbox-create ${DESTDIR}${LIBEXEC}
+	${INSTALL} -m 2755 dma ${DESTDIR}${SBIN}
+	${INSTALL} -m 4754 dma-mbox-create ${DESTDIR}${LIBEXEC}
 	${INSTALL} -m 0644 dma.8 ${DESTDIR}${MAN}/man8/
 
 sendmail-link:
@@ -61,11 +61,10 @@
 	cd ${DESTDIR}${SBIN} && ${LN} ${SYMLINK} dma mailq
 
 install-spool-dirs:
-	${INSTALL} -d -m 2775 -o root -g mail ${DESTDIR}${DMASPOOL}
-	${INSTALL} -d -m 2775 -o root -g mail ${DESTDIR}${VARMAIL}
+	${INSTALL} -d -m 2775 ${DESTDIR}${DMASPOOL}
+	${INSTALL} -d -m 2775 ${DESTDIR}${VARMAIL}
 
 permissions:
-	-${CHGRP} mail ${DESTDIR}${VARMAIL}/*
 	-${CHMOD} g+w ${DESTDIR}${VARMAIL}/*
 	-${CHMOD} 660 ${DESTDIR}${DMASPOOL}/flush
 
@@ -74,14 +73,14 @@
 	@if [ -e ${DESTDIR}${CONFDIR}/dma.conf ]; then \
 		echo "Not overwriting ${DESTDIR}${CONFDIR}/dma.conf."; \
 	else \
-		echo ${INSTALL} -m 644 -o root -g mail dma.conf ${DESTDIR}${CONFDIR}; \
-		${INSTALL} -m 644 -o root -g mail dma.conf ${DESTDIR}${CONFDIR}; \
+		echo ${INSTALL} -m 644 dma.conf ${DESTDIR}${CONFDIR}; \
+		${INSTALL} -m 644 dma.conf ${DESTDIR}${CONFDIR}; \
 	fi
 	@if [ -e ${DESTDIR}${CONFDIR}/auth.conf ]; then \
 		echo "Not overwriting ${DESTDIR}${CONFDIR}/auth.conf."; \
 	else \
-		echo ${INSTALL} -m 640 -o root -g mail auth.conf ${DESTDIR}${CONFDIR}; \
-		${INSTALL} -m 640 -o root -g mail auth.conf ${DESTDIR}${CONFDIR}; \
+		echo ${INSTALL} -m 640 auth.conf ${DESTDIR}${CONFDIR}; \
+		${INSTALL} -m 640 auth.conf ${DESTDIR}${CONFDIR}; \
 	fi
 
 aliases_parse.c: aliases_parse.y
