diff --git a/configure.in b/configure.in
index 03ea7f8161fec12ed317610b3473a63e36c43079..301a15914ae3b649b68c2bdd6af16cb741f933d0 100644
--- a/configure.in
+++ b/configure.in
@@ -528,7 +528,8 @@ AC_CHECK_FUNCS( socket \
                 tcgetattr \
                 perror \
                 closesocket \
-                setvbuf
+                setvbuf \
+                sigaction
 )
 
 dnl removed 'getpass' check on October 26, 2000