Index: libressl-3.1.0/crypto/Makefile.am
===================================================================
--- libressl-3.1.0.orig/crypto/Makefile.am
+++ libressl-3.1.0/crypto/Makefile.am
@@ -721,6 +721,9 @@ libcrypto_la_SOURCES += idea/i_ofb64.c
 libcrypto_la_SOURCES += idea/i_skey.c
 noinst_HEADERS += idea/idea_lcl.h
 
+# kdftree
+libcrypto_la_SOURCES += kdftree/kdftree.c
+
 # lhash
 libcrypto_la_SOURCES += lhash/lh_stats.c
 libcrypto_la_SOURCES += lhash/lhash.c
Index: libressl-3.1.0/include/openssl/Makefile.am
===================================================================
--- libressl-3.1.0.orig/include/openssl/Makefile.am
+++ libressl-3.1.0/include/openssl/Makefile.am
@@ -35,6 +35,7 @@ opensslinclude_HEADERS += gost.h
 opensslinclude_HEADERS += hkdf.h
 opensslinclude_HEADERS += hmac.h
 opensslinclude_HEADERS += idea.h
+opensslinclude_HEADERS += kdftree.h
 opensslinclude_HEADERS += lhash.h
 opensslinclude_HEADERS += md4.h
 opensslinclude_HEADERS += md5.h