diff --git a/tools/build/depend-cleanup.sh b/tools/build/depend-cleanup.sh
index d2e31dab31be..79033914f114 100755
--- a/tools/build/depend-cleanup.sh
+++ b/tools/build/depend-cleanup.sh
@@ -1,87 +1,92 @@
 #!/bin/sh
 #
 # $FreeBSD$
 #
 # Our current make(1)-based approach to dependency tracking cannot cope with
 # certain source tree changes, including:
 # - removing source files
 # - replacing generated files with files committed to the tree
 # - changing file extensions (e.g. a C source file rewritten in C++)
 #
 # We handle those cases here in an ad-hoc fashion by looking for the known-
 # bad case in the main .depend file, and if found deleting all of the related
 # .depend files (including for example the lib32 version).
 #
 # These tests increase the build time (albeit by a small amount), so they
 # should be removed once enough time has passed and it is extremely unlikely
 # anyone would try a NO_CLEAN build against an object tree from before the
 # related change.  One year should be sufficient.
 
 OBJTOP=$1
 if [ ! -d "$OBJTOP" ]; then
 	echo "usage: $(basename $0) objtop" >&2
 	exit 1
 fi
 
 # $1 directory
 # $2 source filename w/o extension
 # $3 source extension
 clean_dep()
 {
 	if [ -e "$OBJTOP"/$1/.depend.$2.pico ] && \
 	    egrep -qw "$2\.$3" "$OBJTOP"/$1/.depend.$2.pico; then \
 		echo "Removing stale dependencies and objects for $2.$3"; \
 		rm -f \
 		    "$OBJTOP"/$1/.depend.$2.* \
 		    "$OBJTOP"/$1/$2.*o \
 		    "$OBJTOP"/obj-lib32/$1/.depend.$2.* \
 		    "$OBJTOP"/obj-lib32/$1/$2.*o
 	fi
 }
 
 # Date      Rev      Description
 # 20200310  r358851  rename of openmp's ittnotify_static.c to .cpp
 clean_dep lib/libomp ittnotify_static c
 # 20200414  r359930  closefrom
 clean_dep lib/libc   closefrom S
 
 # 20200826  r364746  OpenZFS merge, apply a big hammer (remove whole tree)
 if [ -e "$OBJTOP"/cddl/lib/libzfs/.depend.libzfs_changelist.o ] && \
     egrep -qw "cddl/contrib/opensolaris/lib/libzfs/common/libzfs_changelist.c" \
     "$OBJTOP"/cddl/lib/libzfs/.depend.libzfs_changelist.o; then
 	echo "Removing old ZFS tree"
 	rm -rf "$OBJTOP"/cddl "$OBJTOP"/obj-lib32/cddl
 fi
 
 # 20200916  WARNS bumped, need bootstrapped crunchgen stubs
 if [ -e "$OBJTOP"/rescue/rescue/rescue.c ] && \
     ! grep -q 'crunched_stub_t' "$OBJTOP"/rescue/rescue/rescue.c; then
 	echo "Removing old rescue(8) tree"
 	rm -rf "$OBJTOP"/rescue/rescue
 fi
 
 # 20210105  fda7daf06301   pfctl gained its own version of pf_ruleset.c
 if [ -e "$OBJTOP"/sbin/pfctl/.depend.pf_ruleset.o ] && \
     egrep -qw "sys/netpfil/pf/pf_ruleset.c" \
     "$OBJTOP"/sbin/pfctl/.depend.pf_ruleset.o; then
 	echo "Removing old pf_ruleset dependecy file"
 	rm -rf "$OBJTOP"/sbin/pfctl/.depend.pf_ruleset.o
 fi
 
 # 20210108  821aa63a0940   non-widechar version of ncurses removed
 if [ -e "$OBJTOP"/lib/ncurses/ncursesw ]; then
 	echo "Removing stale ncurses objects"
 	rm -rf "$OBJTOP"/lib/ncurses "$OBJTOP"/obj-lib32/lib/ncurses
 fi
 
 # 20210608  f20893853e8e    move from atomic.S to atomic.c
 clean_dep   cddl/lib/libspl atomic S
 # 20211207  cbdec8db18b5    switch to libthr-friendly pdfork
 clean_dep   lib/libc        pdfork S
 
 # 20211230  5e6a2d6eb220    libc++.so.1 path changed in ldscript
 if [ -e "$OBJTOP"/lib/libc++/libc++.ld ] && \
     fgrep -q "/usr/lib/libc++.so" "$OBJTOP"/lib/libc++/libc++.ld; then
 	echo "Removing old libc++ linker script"
 	rm -f "$OBJTOP"/lib/libc++/libc++.ld
 fi
+
+# 20220312  5fc3cc2713ef    move from bcmp.S to bcmp.c
+if [ "$MACHINE_ARCH" = "amd64" ]; then
+    clean_dep lib/libc bcmp S
+fi