BUILD: add Haiku as supported target.
diff --git a/README b/README
index a99b845..b8c4e78 100644
--- a/README
+++ b/README
@@ -47,6 +47,7 @@
   - aix51       for AIX 5.1
   - aix52       for AIX 5.2
   - cygwin      for Cygwin
+  - haiku       for Haiku
   - generic     for any other OS or version.
   - custom      to manually adjust every setting