diff --git a/ObsoleteFiles.inc b/ObsoleteFiles.inc
--- a/ObsoleteFiles.inc
+++ b/ObsoleteFiles.inc
@@ -51,6 +51,11 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
+# 20250717: libopencsd libraries moved to /usr/lib and made private
+OLD_FILES+=lib/libopencsd.so.0
+OLD_FILES+=usr/lib/libopencsd.a
+OLD_FILES+=usr/lib/libopencsd.so
+
 # 20250710: share: Delete bitrotted make_*_driver.sh scripts
 OLD_FILES+=usr/share/examples/drivers/README
 OLD_FILES+=usr/share/examples/drivers/make_device_driver.sh
diff --git a/lib/libopencsd/Makefile b/lib/libopencsd/Makefile
--- a/lib/libopencsd/Makefile
+++ b/lib/libopencsd/Makefile
@@ -1,8 +1,3 @@
-PACKAGE=lib${LIB}
-SHLIBDIR?=	/lib
-
-.include <src.opts.mk>
-
 OPENCSDSRC=	${SRCTOP}/contrib/opencsd
 
 .PATH:	${OPENCSDSRC}/decoder/source/ete/		\
@@ -182,6 +177,7 @@
 LIBADD= cxxrt
 
 WARNS?= 1
+PRIVATELIB=	true
 
 HAS_TESTS=