diff --git a/cfg/bsd.cfg b/cfg/bsd.cfg
index ce7944b3d..19e82036a 100644
--- a/cfg/bsd.cfg
+++ b/cfg/bsd.cfg
@@ -314,4 +314,8 @@
        inclusion in the next POSIX revision (Issue 8).-->
   <define name="SEEK_DATA" value="3"/>
   <define name="SEEK_HOLE" value="4"/>
+  <!-- Old BSD names for the same constants; just for compatibility. -->
+  <define name="L_INCR" value="SEEK_CUR"/>
+  <define name="L_SET" value="SEEK_SET"/>
+  <define name="L_XTND" value="SEEK_END"/>
 </def>