--- asdcplib/configure.ac	2014-01-06 20:08:54.000000000 +0100
+++ asdcplib/configure.ac.new	2014-05-16 13:05:45.689691678 +0200
@@ -49,6 +49,9 @@
 AC_CANONICAL_HOST
 case $host_os in
        openbsd*) openbsd_host=true ;;
+       cygwin* | mingw32*)
+            openbsd_host=false
+            CPPFLAGS="${CPPFLAGS} -DKM_WIN32" ;;
        *)        openbsd_host=false ;;
 esac
 AM_CONDITIONAL([OPENBSD_HOST], [test x$openbsd_host = xtrue])