1 files changed, 1 insertions, 0 deletions

diff --git a/src/msdos.c b/src/msdos.c
index 1ded2ced817..8c4e989181a 100644
--- a/src/msdos.c
+++ b/src/msdos.c
@@ -2396,6 +2396,7 @@ request_sigio () {}
 setpgrp () {return 0; }
 setpriority (x,y,z) int x,y,z; { return 0; }
 sigsetmask (x) int x; { return 0; }
+sigblock (mask) int mask; { return 0; } 
 unrequest_sigio () {}
 
 #ifndef HAVE_SELECT