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https://src.fedoraproject.org/rpms/vigra/raw/rawhide/f/vigra-openexr3.patch
https://bugs.gentoo.org/823632
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -107,7 +107,22 @@ VIGRA_FIND_PACKAGE(FFTW3F NAMES libfftw3
 
 
 IF(WITH_OPENEXR)
+    FIND_PACKAGE(Imath CONFIG)
+    IF(TARGET Imath::Imath)
+        FIND_PACKAGE(OpenEXR CONFIG)
+        SET(OPENEXR_LIBRARIES
+		    OpenEXR::OpenEXR
+		    OpenEXR::Iex
+			OpenEXR::IlmThread
+			Imath::Imath
+		)
+		get_target_property(OPENEXR_INCLUDE_DIR OpenEXR::OpenEXRConfig INTERFACE_INCLUDE_DIRECTORIES)
+		get_target_property(IMATH_INCLUDE_DIR Imath::ImathConfig INTERFACE_INCLUDE_DIRECTORIES)
+		include_directories(${OPENEXR_INCLUDE_DIR} ${IMATH_INCLUDE_DIR})
+		set(OPENEXR_FOUND TRUE)
+	ELSE()
     VIGRA_FIND_PACKAGE(OpenEXR)
+	ENDIF()
 ENDIF()
 
 IF(WITH_HDF5)
--- a/src/impex/CMakeLists.txt
+++ b/src/impex/CMakeLists.txt
@@ -85,6 +85,7 @@ IF(TIFF_FOUND)
 ENDIF(TIFF_FOUND)
 
 IF(OPENEXR_FOUND)
+  cmake_policy(SET CMP0028 NEW)
   TARGET_LINK_LIBRARIES(vigraimpex ${OPENEXR_LIBRARIES})
 ENDIF(OPENEXR_FOUND)