Autoconf 2.72 seems to be under preparation upstream, I therefore started to build dependent components to verify that they can be built once it lands in Fedora.

Your component fails to build with the new version of autoconf, due to the following error:

---
checking for IPv6 compile-time support without -DINET6... ./configure: line 10559: syntax error near unexpected token `;;'
./configure: line 10559: `rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext ;;'
+ cat config.log
This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.

It was created by Kerberos 5 configure 1.19.2, which was
generated by GNU Autoconf 2.72c.47-75861.  Invocation command line was
---

Further investigation as shown a bug in the aclocal.m4 file from krb5, a misplace closing "fi".
Please look at the following diff for further details:

diff --git a/src/aclocal.m4 b/src/aclocal.m4
index 5afb96e..cb9a1bf 100644
--- a/src/aclocal.m4
+++ b/src/aclocal.m4
@@ -404,8 +404,9 @@ AC_TRY_COMPILE([
   struct sockaddr_in6 in;
   AF_INET6;
   IN6_IS_ADDR_LINKLOCAL (&in.sin6_addr);
-],krb5_cv_inet6=yes,krb5_cv_inet6=no)])
+],krb5_cv_inet6=yes,krb5_cv_inet6=no)
 fi
+])
 AC_MSG_RESULT($krb5_cv_inet6)
 if test "$krb5_cv_inet6" = no && test "$ac_cv_func_inet_ntop" = yes; then
 AC_MSG_CHECKING(for IPv6 compile-time support with -DINET6)
-- 
2.38.1