diff --git a/configure.in b/configure.in
index 383c2e2a8..3b403e0b4 100644
--- a/configure.in
+++ b/configure.in
@@ -21,6 +21,8 @@ AC_CANONICAL_HOST
 CANONICAL_HOST=$host
 AC_SUBST(CANONICAL_HOST)
 
+AC_SYS_LARGEFILE
+
 dnl
 dnl this is needed to run the configure tests against glibc
 dnl
@@ -247,6 +249,7 @@ AC_CHECK_HEADERS([\
 	libutil.h				\
 	limits.h				\
 	maillock.h				\
+	netgroup.h				\
 	netinet/in6_machtypes.h			\
 	netinfo/ni.h				\
 	pthread.h				\
@@ -387,7 +390,7 @@ rk_TELNET
 dnl Some operating systems already have com_err and compile_et
 CHECK_COMPILE_ET
 
-AC_AUTH_MODULES
+rk_AUTH_MODULES([sia afskauthlib])
 
 rk_DESTDIRS