diff --git a/src/Makefile.in b/src/Makefile.in
index 4d34f7e9c2..af01094ec6 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -93,6 +93,7 @@ all::
 	@if test ! -d png; then mkdir png; fi
 	@if test ! -d zlib; then mkdir zlib; fi
 	@if test ! -d iodbc; then mkdir iodbc; fi
+	@if test ! -d unix; then mkdir unix; fi
 
 install::
 	@echo " "