diff --git a/whatmask-1.2-configure-c99.patch b/whatmask-1.2-configure-c99.patch
new file mode 100644
index 0000000..757988f
--- /dev/null
+++ b/whatmask-1.2-configure-c99.patch
@@ -0,0 +1,70 @@
+--- whatmask-1.2/configure	2003-11-14 23:16:29.000000000 +0000
++++ new/configure	2022-12-23 07:50:46.354399118 +0000
+@@ -907,7 +907,7 @@
+ #line 908 "configure"
+ #include "confdefs.h"
+ 
+-main(){return(0);}
++int main(){return(0);}
+ EOF
+ if { (eval echo configure:913: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+   ac_cv_prog_cc_works=yes
+@@ -1221,8 +1221,8 @@
+ #define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))
+ #define XOR(e, f) (((e) && !(f)) || (!(e) && (f)))
+ int main () { int i; for (i = 0; i < 256; i++)
+-if (XOR (islower (i), ISLOWER (i)) || toupper (i) != TOUPPER (i)) exit(2);
+-exit (0); }
++if (XOR (islower (i), ISLOWER (i)) || toupper (i) != TOUPPER (i)) return 2;
++return 0; }
+ 
+ EOF
+ if { (eval echo configure:1229: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+@@ -1324,12 +1324,12 @@
+ #line 1325 "configure"
+ #include "confdefs.h"
+ #include <stdio.h>
+-main()
++int main()
+ {
+   FILE *f=fopen("conftestval", "w");
+-  if (!f) exit(1);
++  if (!f) return 1;
+   fprintf(f, "%d\n", sizeof(unsigned short));
+-  exit(0);
++  return 0;
+ }
+ EOF
+ if { (eval echo configure:1336: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+@@ -1363,12 +1363,12 @@
+ #line 1364 "configure"
+ #include "confdefs.h"
+ #include <stdio.h>
+-main()
++int main()
+ {
+   FILE *f=fopen("conftestval", "w");
+-  if (!f) exit(1);
++  if (!f) return 1;
+   fprintf(f, "%d\n", sizeof(unsigned int));
+-  exit(0);
++  return 0;
+ }
+ EOF
+ if { (eval echo configure:1375: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+@@ -1402,12 +1402,12 @@
+ #line 1403 "configure"
+ #include "confdefs.h"
+ #include <stdio.h>
+-main()
++int main()
+ {
+   FILE *f=fopen("conftestval", "w");
+-  if (!f) exit(1);
++  if (!f) return 1;
+   fprintf(f, "%d\n", sizeof(unsigned long));
+-  exit(0);
++  return 0;
+ }
+ EOF
+ if { (eval echo configure:1414: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
diff --git a/whatmask.spec b/whatmask.spec
index d1818c3..c24108a 100644
--- a/whatmask.spec
+++ b/whatmask.spec
@@ -1,12 +1,14 @@
 Name:           whatmask
 Version:        1.2
-Release:        26%{?dist}
+Release:        40%{?dist}
 Summary:        Convert between different netmask types and show information
 
-License:        GPLv2+
+# Automatically converted from old format: GPLv2+ - review is highly recommended.
+License:        GPL-2.0-or-later
 URL:            http://www.laffeycomputer.com/whatmask.html
 Source0:        http://downloads.laffeycomputer.com/current_builds/whatmask/whatmask-1.2.tar.gz
-
+Patch0:         whatmask-1.2-configure-c99.patch
+BuildRequires: make
 BuildRequires:  gcc
 
 %description
@@ -17,6 +19,7 @@ interface.
 
 %prep
 %setup -q
+%patch -P0 -p1
 
 %build
 %configure
@@ -35,6 +38,48 @@ make install DESTDIR=$RPM_BUILD_ROOT
 %{_mandir}/man1/*
 
 %changelog
+* Fri Jul 17 2026 Fedora Release Engineering <releng@fedoraproject.org> - 1.2-40
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild
+
+* Sat Jan 17 2026 Fedora Release Engineering <releng@fedoraproject.org> - 1.2-39
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_44_Mass_Rebuild
+
+* Fri Jul 25 2025 Fedora Release Engineering <releng@fedoraproject.org> - 1.2-38
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_43_Mass_Rebuild
+
+* Sun Jan 19 2025 Fedora Release Engineering <releng@fedoraproject.org> - 1.2-37
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild
+
+* Fri Jul 26 2024 Miroslav Suchý <msuchy@redhat.com> - 1.2-36
+- convert license to SPDX
+
+* Sat Jul 20 2024 Fedora Release Engineering <releng@fedoraproject.org> - 1.2-35
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild
+
+* Sat Jan 27 2024 Fedora Release Engineering <releng@fedoraproject.org> - 1.2-34
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild
+
+* Sat Jul 22 2023 Fedora Release Engineering <releng@fedoraproject.org> - 1.2-33
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild
+
+* Sat Jan 21 2023 Fedora Release Engineering <releng@fedoraproject.org> - 1.2-32
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild
+
+* Fri Dec 23 2022 Peter Fordham <peter.fordham@gmail.com> - 1.2-31
+- Port configure script to C99.
+
+* Sat Jul 23 2022 Fedora Release Engineering <releng@fedoraproject.org> - 1.2-30
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_37_Mass_Rebuild
+
+* Sat Jan 22 2022 Fedora Release Engineering <releng@fedoraproject.org> - 1.2-29
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_36_Mass_Rebuild
+
+* Fri Jul 23 2021 Fedora Release Engineering <releng@fedoraproject.org> - 1.2-28
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild
+
+* Wed Jan 27 2021 Fedora Release Engineering <releng@fedoraproject.org> - 1.2-27
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild
+
 * Wed Jul 29 2020 Fedora Release Engineering <releng@fedoraproject.org> - 1.2-26
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild