Use __cmake_in_source_build

libical.spec

@@ -1,7 +1,9 @@
+%global __cmake_in_source_build 1
+
 Summary:	Reference implementation of the iCalendar data type and serialization format
 Name:		libical
 Version:	3.0.8
-Release:	2%{?dist}
+Release:	3%{?dist}
 License:	LGPLv2 or MPLv2.0
 URL:		https://libical.github.io/libical/
 Source:		https://github.com/%{name}/%{name}/archive/v%{version}/%{name}-%{version}.tar.gz
@@ -134,6 +136,9 @@ make test ARGS="-V" -C %{_target_platform}
 %{_datadir}/gtk-doc/html/%{name}-glib
 
 %changelog
+* Fri Jul 24 2020 Jeff Law <law@redhat.com> - 3.0.8-3
+- Use __cmake_in_source_build
+
 * Fri May 15 2020 Pete Walter <pwalter@fedoraproject.org> - 3.0.8-2
 - Rebuild for ICU 67