diff --git a/configure.ac b/configure.ac
index 135cf921..6b60c121 100644
--- a/configure.ac
+++ b/configure.ac
@@ -198,7 +198,6 @@ AC_CHECK_HEADERS(sys/fmutex.h)
 AC_CHECK_HEADERS(sys/ioctl.h sys/sockio.h)
 AC_CHECK_HEADERS(sys/resource.h)
 AC_CHECK_HEADERS(sys/select.h)
-AC_CHECK_HEADERS(sys/signal.h)
 AC_CHECK_HEADERS(sys/socket.h)
 AC_CHECK_HEADERS(sys/time.h)
 AC_CHECK_HEADERS(sys/utsname.h)
diff --git a/src/main/select.c b/src/main/select.c
index 7382a0c3..7226a8b2 100644
--- a/src/main/select.c
+++ b/src/main/select.c
@@ -7,9 +7,6 @@
 #include <errno.h>
 #include <signal.h>
 #include <string.h> /* FreeBSD FD_ZERO() macro calls bzero() */
-#ifdef HAVE_SYS_SIGNAL_H
-#include <sys/signal.h>
-#endif
 #ifdef __GNU__ /* For GNU Hurd bug workaround in set_handlers() */
 #include <sys/stat.h> /* OS/2 needs this after sys/types.h */
 #endif
diff --git a/src/osdep/generic.h b/src/osdep/generic.h
index 357b602d..1f72d531 100644
--- a/src/osdep/generic.h
+++ b/src/osdep/generic.h
@@ -7,18 +7,10 @@
 #include <limits.h> /* may contain PIPE_BUF definition on some systems */
 #endif
 
-#ifdef HAVE_SYS_SIGNAL_H
-#include <sys/signal.h> /* may contain SA_RESTART */
-#endif
-
 #ifdef HAVE_STDDEF_H
 #include <stddef.h> /* may contain offsetof() */
 #endif
 
-#ifndef SA_RESTART
-#define SA_RESTART	0
-#endif
-
 #ifndef PIPE_BUF
 #define PIPE_BUF	512 /* POSIX says that. -- Mikulas */
 #endif
diff --git a/src/osdep/osdep.c b/src/osdep/osdep.c
index a8895539..37a13013 100644
--- a/src/osdep/osdep.c
+++ b/src/osdep/osdep.c
@@ -15,9 +15,6 @@
 #ifdef HAVE_SYS_IOCTL_H
 #include <sys/ioctl.h>
 #endif
-#ifdef HAVE_SYS_SIGNAL_H
-#include <sys/signal.h>
-#endif
 #include <sys/types.h>
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>	/* Need to be after sys/types.h */
diff --git a/src/osdep/signals.c b/src/osdep/signals.c
index 7de1213a..b2632a53 100644
--- a/src/osdep/signals.c
+++ b/src/osdep/signals.c
@@ -8,9 +8,6 @@
 #include <signal.h>
 #include <stdlib.h>
 #include <string.h>
-#ifdef HAVE_SYS_SIGNAL_H
-#include <sys/signal.h>
-#endif
 #include <sys/types.h>
 #ifdef HAVE_SYS_WAIT_H
 #include <sys/wait.h>
diff --git a/src/viewer/dump/dump.c b/src/viewer/dump/dump.c
index 0958f070..c3f1fa32 100644
--- a/src/viewer/dump/dump.c
+++ b/src/viewer/dump/dump.c
@@ -8,9 +8,6 @@
 #include <stdio.h>
 #include <string.h>
 #include <sys/types.h> /* NetBSD flavour */
-#ifdef HAVE_SYS_SIGNAL_H
-#include <sys/signal.h>
-#endif
 #ifdef HAVE_FCNTL_H
 #include <fcntl.h> /* OS/2 needs this after sys/types.h */
 #endif