--- src/Makefile.in
+++ src/Makefile.in
@@ -397,7 +397,7 @@
 # Red Hat "by design" bug #82369
 
 # Additional preprocessor definitions
-stunnel_CPPFLAGS = -I$(SYSROOT)/usr/kerberos/include \
+stunnel_CPPFLAGS =                                   \
 	-I$(SSLDIR)/include -DLIBDIR='"$(pkglibdir)"' \
 	-DCONFDIR='"$(sysconfdir)/stunnel"'