From a461a98baecb4b2bee4fdf198d2602da8b4baec0 Mon Sep 17 00:00:00 2001
From: Olaf Meeuwissen <paddy-hack@member.fsf.org>
Date: Sat, 15 Jul 2017 22:48:29 +0900
Subject: [PATCH] plustek-pp: Replace sys/signal.h include with signal.h

All other backends already `#include <signal.h>` directly, without any
configure time checking or problems.

Fixes [-Wcc] compiler warning on Alpine.
---
 backend/plustek-pp_scan.h | 6 +-----
 configure.ac              | 2 +-
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/backend/plustek-pp_scan.h b/backend/plustek-pp_scan.h
index 5a8f9d723..1764c7957 100644
--- a/backend/plustek-pp_scan.h
+++ b/backend/plustek-pp_scan.h
@@ -73,11 +73,7 @@
 # include <stdio.h>
 # include <unistd.h>
 # include <sys/time.h>
-# ifdef HAVE_SYS_SIGNAL_H
-#  include <sys/signal.h>
-# else
-#  include <signal.h>
-# endif
+# include <signal.h>
 # include <sys/ioctl.h>
 # ifdef HAVE_SYS_IO_H
 #  include <sys/io.h>
diff --git a/configure.ac b/configure.ac
index d84819661..119d2dbe8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -192,7 +192,7 @@ dnl Checks for header files.
 dnl ***********************************************************************
 AC_HEADER_STDC
 AC_CHECK_HEADERS(fcntl.h unistd.h libc.h sys/dsreq.h sys/select.h \
-    sys/time.h sys/shm.h sys/ipc.h sys/signal.h sys/scanio.h os2.h \
+    sys/time.h sys/shm.h sys/ipc.h sys/scanio.h os2.h \
     sys/socket.h sys/io.h sys/hw.h sys/types.h linux/ppdev.h \
     dev/ppbus/ppi.h machine/cpufunc.h sys/sem.h sys/poll.h \
     windows.h be/kernel/OS.h limits.h sys/ioctl.h asm/types.h\