Port configure script to C99

Related to:

  <https://fedoraproject.org/wiki/Changes/PortingToModernC>
  <https://fedoraproject.org/wiki/Toolchain/PortingToModernC>

xsane-configure-c99.patch

@@ -0,0 +1,36 @@
+Avoid implicit function declarations, for improved compatibility with
+future compilers.
+
+Fixed upstream via:
+
+commit 562008027f343127d70bae44457cf8f06c666428
+Author: Ralph Little <littlesincanada@yahoo.co.uk>
+Date:   Thu Aug 29 21:49:08 2019 -0700
+
+    m4/sane.m4: remove m4/sane.m4 and update aclocal.m4 to suit.
+    
+    We are now using pkg-config and it is pretty much a one-liner.
+    No point in a whole file in m4 for just this feature.
+
+diff -up xsane-0.999/configure.c99 xsane-0.999/configure
+--- xsane-0.999/configure.c99	2023-01-17 17:11:53.179785420 +0100
++++ xsane-0.999/configure	2023-01-17 17:11:58.234735290 +0100
+@@ -6672,6 +6672,7 @@ else
+ 
+ #include <sane/sane.h>
+ #include <stdio.h>
++#include <stdlib.h>
+ 
+ int
+ main ()
+diff -up xsane-0.999/m4/sane.m4.c99 xsane-0.999/m4/sane.m4
+--- xsane-0.999/m4/sane.m4.c99	2023-01-17 17:11:08.940224113 +0100
++++ xsane-0.999/m4/sane.m4	2023-01-17 17:11:11.565198082 +0100
+@@ -44,6 +44,7 @@ dnl
+       AC_TRY_RUN([
+ #include <sane/sane.h>
+ #include <stdio.h>
++#include <stdlib.h>
+ 
+ int 
+ main ()

xsane.spec

@@ -10,7 +10,7 @@
 Name: xsane
 Summary: X Window System front-end for the SANE scanner interface
 Version: 0.999
-Release: 43%{?dist}
+Release: 44%{?dist}
 Source0: http://www.xsane.org/download/%{name}-%{version}.tar.gz
 Source1: xsane-256x256.png
 # use "xdg-open" instead of "netscape" to launch help browser
@@ -69,6 +69,9 @@ Patch15: xsane-0.999-signal-handling.patch
 
 # autoconf-generated files
 Patch100: xsane-0.999-7-autoconf.patch.bz2
+
+Patch101: xsane-configure-c99.patch
+
 License: GPLv2+ and LGPLv2+
 URL: http://www.xsane.org/
 
@@ -142,6 +145,7 @@ done
 %patch15 -p1 -b .signal-handling
 
 %patch100 -p1 -b .autoconf
+%patch101 -p1 -b .c99
 
 # in-root config.h breaks off-root building
 rm include/config.h
@@ -265,6 +269,9 @@ fi
 %{_datadir}/sane/xsane
 
 %changelog
+* Tue Jan 17 2023 Florian Weimer <fweimer@redhat.com> - 0.999-44
+- Port configure script to C99
+
 * Sat Jul 23 2022 Fedora Release Engineering <releng@fedoraproject.org> - 0.999-43
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_37_Mass_Rebuild