From: Richard M. Stallman <rms@gnu.org>
Date: Sat, 29 May 1993 05:02:18 +0000 (+0000)
Subject: (MAXDESC): Get it from FD_SETSIZE if that exists.
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(MAXDESC): Get it from FD_SETSIZE if that exists.
---

diff --git a/src/process.c b/src/process.c
index f2c01258774..7bada8607c7 100644
--- a/src/process.c
+++ b/src/process.c
@@ -235,7 +235,11 @@ int update_tick;
 /* We could get this from param.h, but better not to depend on finding that.
    And better not to risk that it might define other symbols used in this
    file.  */
+#ifdef FD_SETSIZE
+#define MAXDESC FD_SETSIZE
+#else
 #define MAXDESC 64
+#endif
 #define SELECT_TYPE fd_set
 #else /* no FD_SET */
 #define MAXDESC 32