diff --git a/iso/libisofs/configure.in.in b/iso/libisofs/configure.in.in
new file mode 100644
index 0000000..78e5b1a
--- /dev/null
+++ b/iso/libisofs/configure.in.in
@@ -0,0 +1 @@
+AC_CHECK_HEADERS(byteswap.h)