--- a/configure.ac	2018-04-29 14:29:31.440768007 -0600
+++ b/configure.ac	2018-04-29 14:41:01.545157191 -0600
@@ -405,6 +405,7 @@
     sysroot=""
     AC_MSG_RESULT([/])
 else
+    SYSROOT=$sysroot
     AC_MSG_RESULT([$sysroot])
 fi
 
--- a/src/Makefile.am	2018-04-29 14:41:25.848584848 -0600
+++ b/src/Makefile.am	2018-04-29 14:41:51.628036083 -0600
@@ -38,7 +38,7 @@
 CLEANFILES = stunnel3
 
 # Red Hat "by design" bug #82369
-stunnel_CPPFLAGS = -I/usr/kerberos/include
+stunnel_CPPFLAGS = -I$(SYSROOT)/usr/kerberos/include
 
 # Additional preprocesor definitions
 stunnel_CPPFLAGS += -I$(SSLDIR)/include