Index: LuxCore-luxcorerender_v2.5/cmake/Dependencies.cmake
===================================================================
--- LuxCore-luxcorerender_v2.5.orig/cmake/Dependencies.cmake
+++ LuxCore-luxcorerender_v2.5/cmake/Dependencies.cmake
@@ -30,7 +30,14 @@ find_package(Threads REQUIRED)
 
 find_package(OpenImageIO REQUIRED)
 include_directories(BEFORE SYSTEM ${OPENIMAGEIO_INCLUDE_DIR})
-find_package(OpenEXR REQUIRED)
+
+# Try to use CMake targets first for OpenEXR 3.x
+find_package(Imath QUIET CONFIG)
+if(NOT TARGET Imath::Imath)
+    find_package(OpenEXR REQUIRED)
+else()
+    set(OPENEXR_LIBRARIES Imath::Imath)
+endif()
 
 if(NOT APPLE)
     # Apple has these available hardcoded and matched in macos repo, see Config_OSX.cmake
Index: LuxCore-luxcorerender_v2.5/deps/openvdb-7.0.0/openvdb/Types.h
===================================================================
--- LuxCore-luxcorerender_v2.5.orig/deps/openvdb-7.0.0/openvdb/Types.h
+++ LuxCore-luxcorerender_v2.5/deps/openvdb-7.0.0/openvdb/Types.h
@@ -6,7 +6,22 @@
 
 #include "version.h"
 #include "Platform.h"
-#include <OpenEXR/half.h>
+#include <OpenEXR/OpenEXRConfig.h>
+#define COMBINED_OPENEXR_VERSION ((10000*OPENEXR_VERSION_MAJOR) + \
+                                  (100*OPENEXR_VERSION_MINOR) + \
+                                  OPENEXR_VERSION_PATCH)
+
+// There's just no easy way to have an `#include` that works in both
+// cases, so we use the version to switch which set of include files we
+// use.
+#if COMBINED_OPENEXR_VERSION >= 20599 /* 2.5.99: pre-3.0 */
+#   include <Imath/ImathVec.h>
+#   include <Imath/half.h>
+#else
+    // OpenEXR 2.x, use the old locations
+#   include <OpenEXR/ImathVec.h>
+#   include <OpenEXR/half.h>
+#endif
 #include <openvdb/math/Math.h>
 #include <openvdb/math/BBox.h>
 #include <openvdb/math/Quat.h>
Index: LuxCore-luxcorerender_v2.5/include/slg/imagemap/imagemap.h
===================================================================
--- LuxCore-luxcorerender_v2.5.orig/include/slg/imagemap/imagemap.h
+++ LuxCore-luxcorerender_v2.5/include/slg/imagemap/imagemap.h
@@ -19,7 +19,22 @@
 #ifndef _SLG_IMAGEMAP_H
 #define	_SLG_IMAGEMAP_H
 
-#include <OpenEXR/half.h>
+#include <OpenEXR/OpenEXRConfig.h>
+#define COMBINED_OPENEXR_VERSION ((10000*OPENEXR_VERSION_MAJOR) + \
+                                  (100*OPENEXR_VERSION_MINOR) + \
+                                  OPENEXR_VERSION_PATCH)
+
+// There's just no easy way to have an `#include` that works in both
+// cases, so we use the version to switch which set of include files we
+// use.
+#if COMBINED_OPENEXR_VERSION >= 20599 /* 2.5.99: pre-3.0 */
+#   include <Imath/ImathVec.h>
+#   include <Imath/half.h>
+#else
+    // OpenEXR 2.x, use the old locations
+#   include <OpenEXR/ImathVec.h>
+#   include <OpenEXR/half.h>
+#endif
 
 #include <string>
 #include <limits>
Index: LuxCore-luxcorerender_v2.5/include/slg/utils/halfserialization.h
===================================================================
--- LuxCore-luxcorerender_v2.5.orig/include/slg/utils/halfserialization.h
+++ LuxCore-luxcorerender_v2.5/include/slg/utils/halfserialization.h
@@ -19,7 +19,22 @@
 #ifndef _SLG_HALFSERIALIZATION_H
 #define	_SLG_HALFSERIALIZATION_H
 
-#include <OpenEXR/half.h>
+#include <OpenEXR/OpenEXRConfig.h>
+#define COMBINED_OPENEXR_VERSION ((10000*OPENEXR_VERSION_MAJOR) + \
+                                  (100*OPENEXR_VERSION_MINOR) + \
+                                  OPENEXR_VERSION_PATCH)
+
+// There's just no easy way to have an `#include` that works in both
+// cases, so we use the version to switch which set of include files we
+// use.
+#if COMBINED_OPENEXR_VERSION >= 20599 /* 2.5.99: pre-3.0 */
+#   include <Imath/ImathVec.h>
+#   include <Imath/half.h>
+#else
+    // OpenEXR 2.x, use the old locations
+#   include <OpenEXR/ImathVec.h>
+#   include <OpenEXR/half.h>
+#endif
 
 #include "luxrays/utils/utils.h"
 #include "luxrays/utils/serializationutils.h"