Move to openexr2 compat package.

pfstools.spec

@@ -1,6 +1,6 @@
 Name:		pfstools
 Version:	2.1.0
-Release:	18%{?dist}
+Release:	19%{?dist}
 Summary:	Programs for handling high-dynamic range images
 
 License:	GPLv2+
@@ -11,10 +11,16 @@ Source0:	http://downloads.sourceforge.net/%{name}/%{name}-%{version}.tgz
 Patch0:         pfstools-octave5.1.patch
 Patch1:         pfstools-freeglut.patch
 
-BuildRequires: make
+BuildRequires:  make
 BuildRequires:	cmake
 BuildRequires:	libtiff-devel
-BuildRequires:	OpenEXR-devel
+# As of OpenEXR 3 upstream has significantly reorganized the libraries
+# including splitting out imath as a standalone library (which this project may
+# or may not need). Please see
+# https://github.com/AcademySoftwareFoundation/Imath/blob/master/docs/PortingGuide2-3.md
+# for porting details and encourage upstream to support it. For now a 2.x
+# compat package is provided.
+BuildRequires:	OpenEXR-devel < 3
 BuildRequires:	octave-devel
 BuildRequires:	libGL-devel
 BuildRequires:	ImageMagick-devel
@@ -302,6 +308,9 @@ make -C %{_target_platform}
 %{_includedir}/pfs
 
 %changelog
+* Sun Aug 01 2021 Richard Shaw <hobbes1069@gmail.com> - 2.1.0-19
+- Move to openexr2 compat package.
+
 * Fri Jul 23 2021 Fedora Release Engineering <releng@fedoraproject.org> - 2.1.0-18
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild