--- a/configure.ac
+++ b/configure.ac
@@ -39,7 +39,7 @@ AC_ARG_WITH(pam,
fi,
)
-if test "use_pam" != "no"; then
+if test "$use_pam" != "no"; then
have_pam=yes
AC_CHECK_HEADER(security/pam_appl.h, [], [have_pam=no])
if test "$have_pam" = "yes"; then