The following patch helps in the case when a sockets library is installed;
in my case, ls080b.zip from the DJGPP site:

=== modified file 'src/msdos.c'
--- src/msdos.c    2014-08-09 16:12:33 +0000
+++ src/msdos.c    2014-08-09 21:51:56 +0000
@@ -4016,7 +4017,7 @@
 #endif


-#ifndef HAVE_SELECT
+#ifndef HAVE_SYS_SELECT_H
 #include "sysselect.h"

 /* This yields the rest of the current time slice to the task manager.


The reasoning is that having select doesn't imply having the sys/select.h
functionality that the following code emulates.

Does that look OK to install?

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