diff -rauN pam_unix2-2.9.1/config.h.in pam_unix2-2.9.1-unix-passwd-no-yp-patch/config.h.in
--- pam_unix2-2.9.1/config.h.in	2012-04-03 15:31:24.000000000 +0200
+++ pam_unix2-2.9.1-unix-passwd-no-yp-patch/config.h.in	2017-12-08 16:15:09.870000003 +0100
@@ -194,3 +194,6 @@
 
 /* Define to 1 if you need to in order for `stat' and other things to work. */
 #undef _POSIX_SOURCE
+
+/* Define to 1 if you have the <rpcsvc/yp_prot.h> header file. */
+#undef HAVE_RPCSVC_YP_PROT_H
diff -rauN pam_unix2-2.9.1/configure.in pam_unix2-2.9.1-unix-passwd-no-yp-patch/configure.in
--- pam_unix2-2.9.1/configure.in	2012-04-03 15:31:17.000000000 +0200
+++ pam_unix2-2.9.1-unix-passwd-no-yp-patch/configure.in	2017-12-08 16:15:22.160000000 +0100
@@ -60,6 +60,7 @@
 AC_CHECK_HEADERS(crypt.h)
 AC_CHECK_HEADERS(stdlib.h pwd.h sys/types.h syslog.h sys/syslog.h string.h strings.h, , AC_MSG_ERROR(some basic headers are missing))
 AC_CHECK_HEADERS(security/pam_appl.h security/pam_modules.h, , AC_MSG_ERROR(broken libpam installation))
+AC_CHECK_HEADERS(rpcsvc/yp_prot.h)
 
 dnl Check for Linux-PAM 0.99.x
 AC_CHECK_HEADERS(security/pam_ext.h)
diff -rauN pam_unix2-2.9.1/src/unix_passwd.c pam_unix2-2.9.1-unix-passwd-no-yp-patch/src/unix_passwd.c
--- pam_unix2-2.9.1/src/unix_passwd.c	2012-04-03 15:24:51.000000000 +0200
+++ pam_unix2-2.9.1-unix-passwd-no-yp-patch/src/unix_passwd.c	2017-12-08 16:15:33.389999993 +0100
@@ -53,8 +53,10 @@
 #include <rpc/types.h>
 #include <nss.h>
 #include <syslog.h>
+#if defined(HAVE_YP_PROT_H)
 #include <rpcsvc/yp_prot.h>
 #include <rpcsvc/ypclnt.h>
+#endif
 
 #define PAM_SM_PASSWORD
 #include <security/pam_modules.h>
@@ -413,6 +415,7 @@
     }
 }
 
+#if defined(HAVE_YP_PROT_H)
 static char *
 getnismaster (pam_handle_t *pamh, int flags)
 {
@@ -445,6 +448,7 @@
 
   return master;
 }
+#endif
 
 static int
 read_loop (int fd, char *buffer, int count)
@@ -1095,6 +1099,7 @@
 
       ulckpwdf ();
     }
+#if defined(HAVE_YP_PROT_H)
   else if (data->service == S_YP)
     {
       struct yppasswd yppwd;
@@ -1137,6 +1142,7 @@
 	  retval = PAM_AUTHTOK_ERR;
 	}
     }
+#endif
 
   return retval;
 }