Index: mysql57-client/Makefile
===================================================================
--- mysql57-client/Makefile	(.../ports-dev/databases)	(working copy)
+++ mysql57-client/Makefile	(.../ports-dev-copy/databases)	(working copy)
@@ -2,6 +2,7 @@
 # $FreeBSD$
 
 PORTNAME=	mysql
+PORTREVISION?=	4
 PKGNAMESUFFIX=	57-client
 
 COMMENT=	Multithreaded SQL database (client)
@@ -29,4 +30,10 @@
 
 CLIENT_ONLY=	yes
 
+# issue 166367: adding symlinks for back-compatibility with $(lib)_r
+post-install:
+	@${LN} -s libmysqlclient.a ${STAGEDIR}${PREFIX}/lib/mysql/libmysqlclient_r.a
+	@${LN} -s libmysqlclient.so ${STAGEDIR}${PREFIX}/lib/mysql/libmysqlclient_r.so
+	@${LN} -s libmysqlclient.so.20 ${STAGEDIR}${PREFIX}/lib/mysql/libmysqlclient_r.so.20
+
 .include "${MASTERDIR}/Makefile"
Index: mysql57-client/pkg-plist
===================================================================
--- mysql57-client/pkg-plist	(.../ports-dev/databases)	(working copy)
+++ mysql57-client/pkg-plist	(.../ports-dev-copy/databases)	(working copy)
@@ -117,6 +117,9 @@
 lib/mysql/libmysqlclient.so
 lib/mysql/libmysqlclient.so.20
 lib/mysql/libmysqlservices.a
+lib/mysql/libmysqlclient_r.a
+lib/mysql/libmysqlclient_r.so
+lib/mysql/libmysqlclient_r.so.20
 libdata/pkgconfig/mysqlclient.pc
 man/man1/comp_err.1.gz
 man/man1/mysql.1.gz