diff --git a/ObsoleteFiles.inc b/ObsoleteFiles.inc
--- a/ObsoleteFiles.inc
+++ b/ObsoleteFiles.inc
@@ -40,6 +40,9 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
+# 20211229 libc++ moved to /lib
+OLD_LIBS+=usr/lib/libc++.so.1
+
 # 20211221 efi_set_variables_supported.3 should be efi_variables_supported.3
 OLD_FILES+=usr/share/man/man3/efi_set_variables_supported.3.gz
 
diff --git a/lib/libc++/Makefile b/lib/libc++/Makefile
--- a/lib/libc++/Makefile
+++ b/lib/libc++/Makefile
@@ -3,6 +3,7 @@
 .include <src.opts.mk>
 
 PACKAGE=	clibs
+SHLIBDIR?=	/lib
 _LIBCXXRTDIR=	${SRCTOP}/contrib/libcxxrt
 HDRDIR=		${SRCTOP}/contrib/llvm-project/libcxx/include
 SRCDIR=		${SRCTOP}/contrib/llvm-project/libcxx/src