Fix building in C99 mode

ytalk-c99.patch

@@ -0,0 +1,16 @@
+configure was generated by a version of autoconf which is incompatible
+with C99 compilers.  It cannot be regenerated with current autoconf
+versions, so only the generated script is patched.
+
+diff --git a/configure b/configure
+index ee6271691bf7d629..96b9f2b4468bbbc1 100755
+--- a/configure
++++ b/configure
+@@ -3359,6 +3359,7 @@ cat confdefs.h >>conftest.$ac_ext
+ cat >>conftest.$ac_ext <<_ACEOF
+ /* end confdefs.h.  */
+ #include <ctype.h>
++#include <stdlib.h>
+ #if ((' ' & 0x0FF) == 0x020)
+ # define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
+ # define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))

ytalk.spec

@@ -1,11 +1,12 @@
 Summary: A chat program for multiple users
 Name: ytalk
 Version: 3.3.0
-Release: 33%{?dist}
+Release: 34%{?dist}
 License: GPLv2+
 URL: http://www.impul.se/ytalk/
 Source: http://www.impul.se/ytalk/%{name}-%{version}.tar.bz2
 Source1: ytalkrc
+Patch1: ytalk-c99.patch
 BuildRequires:  gcc
 BuildRequires: ncurses-devel
 
@@ -17,7 +18,7 @@ the same talk daemon(s), but YTalk allows for multiple connections
 to other users as well as an easy-to-use menu of commands.
 
 %prep
-%setup -q
+%autosetup
 
 %build
 %configure
@@ -33,6 +34,9 @@ make install DESTDIR=%{buildroot}
 %config(noreplace) /etc/ytalkrc
 
 %changelog
+* Mon Sep  9 2019 Florian Weimer <fweimer@redhat.com> - 3.3.0-34
+- Fix building in C99 mode
+
 * Sat Jul 27 2019 Fedora Release Engineering <releng@fedoraproject.org> - 3.3.0-33
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild