Fix-configure-issue.

a52dec-configure-c99.patch

@@ -0,0 +1,23 @@
+Avoid an undeclared exit function call in obscure configure check.
+This improves compatibility with strict(er) C99 compilers, which may
+not support implicit function declarations because they were removed
+from the C language in 1999.
+
+Not submitted upstream as regeneration of configure with new autoconf
+would fix.
+
+diff --git a/configure b/configure
+index b81fdff..49bcfc6 100755
+--- a/configure
++++ b/configure
+@@ -3850,8 +3850,8 @@ main ()
+   for (i = 0; i < 256; i++)
+     if (XOR (islower (i), ISLOWER (i))
+         || toupper (i) != TOUPPER (i))
+-      exit(2);
+-  exit (0);
++      return 2;
++  return 0;
+ }
+ _ACEOF
+ rm -f conftest$ac_exeext

a52dec.spec

@@ -1,13 +1,14 @@
 Summary:    Small test program for liba52
 Name:       a52dec
 Version:    0.7.4
-Release:    43%{?dist}
+Release:    44%{?dist}
 License:    GPLv2
 URL:        http://liba52.sourceforge.net
 Source0:    %{url}/files/%{name}-%{version}.tar.gz
 Patch0:     a52dec-configure-optflags.patch
 Patch1:     a52dec-0.7.4-rpath64.patch
 Patch2:     liba52-silence.patch
+Patch3:     a52dec-configure-c99.patch
 
 BuildRequires: gcc
 BuildRequires: make
@@ -90,6 +91,9 @@ done
 
 
 %changelog
+* Wed Nov 30 2022 Peter Fordham <peter.fordham@gmail.com> - 0.7.4-44
+- Port configure script to C99
+
 * Wed Jul 20 2022 Fedora Release Engineering <releng@fedoraproject.org> - 0.7.4-43
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_37_Mass_Rebuild