diff -ur openssh-7.9p1.orig/openbsd-compat/regress/Makefile.in openssh-7.9p1/openbsd-compat/regress/Makefile.in
--- openssh-7.9p1.orig/openbsd-compat/regress/Makefile.in	2018-10-16 17:01:20.000000000 -0700
+++ openssh-7.9p1/openbsd-compat/regress/Makefile.in	2018-12-19 11:03:14.421028691 -0800
@@ -7,7 +7,7 @@
 CC=@CC@
 LD=@LD@
 CFLAGS=@CFLAGS@
-CPPFLAGS=-I. -I.. -I$(srcdir) -I$(srcdir)/.. @CPPFLAGS@ @DEFS@
+CPPFLAGS=-I. -I.. -I$(srcdir) -I../.. @CPPFLAGS@ @DEFS@
 EXEEXT=@EXEEXT@
 LIBCOMPAT=../libopenbsd-compat.a
 LIBS=@LIBS@