--- a/Makefile	Wed Mar 01 10:08:26 2017 -0800
+++ b/Makefile	Thu Mar 02 12:45:31 2017 -0800
@@ -7,6 +7,7 @@
 m := google-authenticator.pp
 
 all:
+	yum -y install pam-devel selinux-policy-devel
 	rpmbuild --rebuild google-authenticator-1.0-0.gita096a62.fc24.6.src.rpm >mylog 2>&1
 	grep Wrote: mylog
 	make -f /usr/share/selinux/devel/Makefile
@@ -20,6 +21,12 @@
 	sed -i -e 's/^ChallengeResponseAuthentication no/ChallengeResponseAuthentication yes/g' /etc/ssh/sshd_config
 	service sshd restart
 
+install-centos7:
+	[ -f ${r} ] || /bin/false
+	yum -y install ${r}
+	sed -i -e 's/PAM-1.0/PAM-1.0\nauth		  required	   pam_google_authenticator.so nullok/g' /etc/pam.d/sshd
+	sed -i -e 's/^ChallengeResponseAuthentication no/ChallengeResponseAuthentication yes/g' /etc/ssh/sshd_config
+	systemctl restart sshd.service
 
 setup:
 	google-authenticator