diff --git a/lib/krb5/Makefile.am b/lib/krb5/Makefile.am
index 86e7110b0..7deaeca1e 100644
--- a/lib/krb5/Makefile.am
+++ b/lib/krb5/Makefile.am
@@ -43,6 +43,8 @@ lib_LTLIBRARIES = libkrb5.la
 
 ERR_FILES = krb5_err.c heim_err.c k524_err.c
 
+libkrb5_la_CPPFLAGS = -DBUILD_KRB5_LIB
+
 libkrb5_la_SOURCES =				\
 	acl.c					\
 	add_et_list.c				\
@@ -147,7 +149,7 @@ libkrb5_la_LDFLAGS = -version-info 18:4:1
 $(libkrb5_la_OBJECTS): $(srcdir)/krb5-protos.h $(srcdir)/krb5-private.h
 
 $(srcdir)/krb5-protos.h:
-	cd $(srcdir) && perl ../../cf/make-proto.pl -q -P comment -o krb5-protos.h $(libkrb5_la_SOURCES) || rm -f krb5-protos.h
+	cd $(srcdir) && perl ../../cf/make-proto.pl -E KRB5_LIB_FUNCTION -q -P comment -o krb5-protos.h $(libkrb5_la_SOURCES) || rm -f krb5-protos.h
 
 $(srcdir)/krb5-private.h:
 	cd $(srcdir) && perl ../../cf/make-proto.pl -q -P comment -p krb5-private.h $(libkrb5_la_SOURCES) || rm -f krb5-private.h