Use C.UTF-8 locale

ant.spec

@@ -36,7 +36,7 @@
 
 Name:           ant
 Version:        1.10.5
-Release:        2%{?dist}
+Release:        3%{?dist}
 Epoch:          0
 Summary:        Java build tool
 Summary(it):    Tool per la compilazione di programmi java
@@ -503,7 +503,7 @@ install -p -m 644 man/%{name}.1 %{buildroot}%{_mandir}/man1/%{name}.1
 
 %if %with tests
 %check
-LC_ALL=en_US.utf8 %{ant} test
+LC_ALL=C.UTF-8 %{ant} test
 %endif
 
 %files
@@ -641,6 +641,10 @@ LC_ALL=en_US.utf8 %{ant} test
 # -----------------------------------------------------------------------------
 
 %changelog
+* Mon Nov 19 2018 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> - 0:1.10.5-3
+- Use C.UTF-8 locale
+  See https://fedoraproject.org/wiki/Changes/Remove_glibc-langpacks-all_from_buildroot
+
 * Mon Aug 20 2018 Mat Booth <mat.booth@redhat.com> - 0:1.10.5-2
 - Enable building the optional junit5 module