--- configure.ac.orig	2011-09-06 09:43:42.000000000 +0100
+++ configure.ac	2011-11-17 15:12:38.567082237 +0000
@@ -14,6 +14,7 @@
 
 dnl Header-file checks
 AC_HEADER_STDC
+AC_CHECK_HEADERS([spawn.h])
 
 if test "x$GCC" = "xyes"; then
   dnl Only use -Wall if we have gcc