diff --git a/ObsoleteFiles.inc b/ObsoleteFiles.inc
--- a/ObsoleteFiles.inc
+++ b/ObsoleteFiles.inc
@@ -51,6 +51,18 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
+# 20250725: Headers installed by krb5 which shouldn't have been.
+OLD_FILES+=usr/include/kadm5/admin_internal.h
+OLD_FILES+=usr/include/kadm5/admin_xdr.h
+OLD_FILES+=usr/include/kadm5/kadm_rpc.h
+OLD_FILES+=usr/include/kadm5/server_internal.h
+OLD_FILES+=usr/include/internal.h
+OLD_FILES+=usr/include/t_daemon.h
+OLD_FILES+=usr/include/t_test.h
+OLD_FILES+=usr/include/dyn.h
+OLD_FILES+=usr/include/dynP.h
+OLD_FILES+=usr/include/gssrpcint.h
+
 # 20250716: Remove an old manual page, vn(4) was removed in FreeBSD 5.0
 OLD_FILES+=usr/share/man/man4/vn.4.gz
 
diff --git a/krb5/lib/kadm5clnt/Makefile b/krb5/lib/kadm5clnt/Makefile
--- a/krb5/lib/kadm5clnt/Makefile
+++ b/krb5/lib/kadm5clnt/Makefile
@@ -36,10 +36,6 @@
 
 INCSDIR=${INCLUDEDIR}/kadm5
 INCS=	admin.h \
-	admin_internal.h \
-	admin_xdr.h \
-	kadm_rpc.h \
-	server_internal.h \
 	${GENI}
 
 KADM_ERR=	kadm_err.et
diff --git a/krb5/lib/kadm5srv/Makefile b/krb5/lib/kadm5srv/Makefile
--- a/krb5/lib/kadm5srv/Makefile
+++ b/krb5/lib/kadm5srv/Makefile
@@ -48,10 +48,6 @@
 
 HDRDIR=	${KRB5_OBJHDR}/kadm5
 HDRS=	${HDRDIR}/admin.h \
-	${HDRDIR}/admin_internal.h \
-	${HDRDIR}/admin_xdr.h \
-	${HDRDIR}/kadm_rpc.h \
-	${HDRDIR}/server_internal.h \
 	${HDRDIR}/chpass_util_strings.h \
 	${HDRDIR}/kadm_err.h
 
diff --git a/krb5/lib/krad/Makefile b/krb5/lib/krad/Makefile
--- a/krb5/lib/krad/Makefile
+++ b/krb5/lib/krad/Makefile
@@ -24,10 +24,6 @@
 	packet.c \
 	remote.c
 
-INCS=	internal.h \
-	t_daemon.h \
-	t_test.h
-
 CFLAGS+=-I${KRB5_DIR}/lib/krad \
 	-I${KRB5_DIR}/include \
 	-I${KRB5_SRCTOP}/include \
diff --git a/krb5/lib/rpc/Makefile b/krb5/lib/rpc/Makefile
--- a/krb5/lib/rpc/Makefile
+++ b/krb5/lib/rpc/Makefile
@@ -65,10 +65,6 @@
 	xdr_sizeof.c \
 	xdr_stdio.c
 
-INCS=	dyn.h \
-	dynP.h \
-	gssrpcint.h
-
 CFLAGS+=-I${KRB5_DIR}/lib/rpc \
 	-I${KRB5_DIR}/include \
 	-I${KRB5_SRCTOP}/include \
@@ -79,6 +75,4 @@
 
 .include <bsd.lib.mk>
 
-.SUFFIXES: .h .c
-
 .PATH:	${KRB5_DIR}/lib/rpc