-# Define odd RSL install location
-AC_CHECK_LIB(rsl, RSL_wsr88d_to_radar, RLS_LIBS="-lrsl")
-AM_CONDITIONAL(HAVE_RSL, test "$RSL_LIBS" != "")
+# Test for Windows vs. Unix
+case "${host}" in
+ *mingw32*) WIN32="yes" ;;
+ *cygwin*) WIN32="yes" ;;
+ *) WIN32="no" ;;
+esac
+if test "$WIN32" = yes; then
+ ac_default_prefix="/"
+fi
+AM_CONDITIONAL([WIN32], test "$WIN32" = "yes")
+AM_CONDITIONAL([NOTWIN32], test "$WIN32" = "no")