Use sigprocmask instead of _sigprocmask
diff --git a/src/setmode.c b/src/setmode.c
index 66f2924..d9c7b8d 100644
--- a/src/setmode.c
+++ b/src/setmode.c
@@ -184,10 +184,10 @@ setmode(const char *p)
* as best we can.
*/
sigfillset(&sigset);
- (void)_sigprocmask(SIG_BLOCK, &sigset, &sigoset);
+ (void)sigprocmask(SIG_BLOCK, &sigset, &sigoset);
(void)umask(mask = umask(0));
mask = ~mask;
- (void)_sigprocmask(SIG_SETMASK, &sigoset, NULL);
+ (void)sigprocmask(SIG_SETMASK, &sigoset, NULL);
setlen = SET_LEN + 2;