1 files changed, 5 insertions, 0 deletions

diff --git a/src/sysselect.h b/src/sysselect.h
index 8295aeb8421..4d8a4d0a3a9 100644
--- a/src/sysselect.h
+++ b/src/sysselect.h
@@ -50,6 +50,11 @@ typedef int fd_set;
 #endif
 
 #ifdef MSDOS
+/* The above #define for 'select' gets in the way because sysselect.h
+   is included in thread.h, which is included everywhere, and 'select'
+   declared in DJGPP system headers has a signature incompatible with
+   'pselect', which we emulate in msdos.c.  */
+#undef select
 #define pselect sys_select
 #endif