Add backward compatibility for EXIM_TMPDIR

[exim.git] / src / src / exim.c

diff --git a/src/src/exim.c b/src/src/exim.c
index c134bf5e6e441bb95c46bc4d8a2c6f8203489c52..02f2a9a4db1affa98de47f5f1495f05ec3a11f5a 100644 (file)
--- a/src/src/exim.c
+++ b/src/src/exim.c
@@ -3899,7 +3899,10 @@ if (log_oneline)
 temporary files are created; Exim doesn't use these (apart from when delivering
 to MBX mailboxes), but called libraries such as DBM libraries may require them.
 If TMPDIR is found in the environment, reset it to the value defined in the
-EXIM_TMPDIR macro, if this macro is defined. */
+EXIM_TMPDIR macro, if this macro is defined.  For backward compatibility this
+macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
+EXIM_TMPDIR by the build scripts.
+*/
 
 #ifdef EXIM_TMPDIR
   {