--- configure.ac	2018-02-28 15:45:34.000000000 +0100
+++ configure.ac	2018-07-13 20:48:53.678923351 +0200
@@ -2836,8 +2836,17 @@
 
 have_rquota=no
 if test -f /usr/include/rpcsvc/rquota.x && test -n "$RPCGEN"; then
+  PKG_CHECK_MODULES(LIBTIRPC, libtirpc, [
+    have_rquota=yes
+    QUOTA_LIBS="$QUOTA_LIBS \$(LIBTIRPC_LIBS)"
+  ], [
+    AC_CHECK_HEADER([rpc/rpc.h], [
+     have_rquota=yes
+    ])
+  ])
+fi
+if test "$have_rquota" = yes; then
   AC_DEFINE(HAVE_RQUOTA,, [Define if you wish to retrieve quota of NFS mounted mailboxes])
-  have_rquota=yes
 fi
 AM_CONDITIONAL(HAVE_RQUOTA, test "$have_rquota" = "yes")
 
--- src/plugins/quota/Makefile.am	2018-02-28 15:45:34.000000000 +0100
+++ src/plugins/quota/Makefile.am	2018-07-13 20:50:16.056369313 +0200
@@ -17,7 +17,8 @@
 	-I$(top_srcdir)/src/lib-storage/index \
 	-I$(top_srcdir)/src/lib-storage/index/imapc \
 	-I$(top_srcdir)/src/lib-storage/index/maildir \
-	-I$(top_srcdir)/src/doveadm
+	-I$(top_srcdir)/src/doveadm \
+	$(LIBTIRPC_CFLAGS)
 
 NOPLUGIN_LDFLAGS =
 lib10_doveadm_quota_plugin_la_LDFLAGS = -module -avoid-version