https://bugs.gentoo.org/833491

--- CMakeLists.txt.orig	2020-01-31 06:03:07.000000000 -0500
+++ CMakeLists.txt	2023-05-17 17:00:27.000000000 -0400
@@ -739,10 +739,9 @@
 ELSE()
 # Common to all platforms except android:
     FIND_PACKAGE(Freetype)
-    FIND_PACKAGE(ilmbase)
     FIND_PACKAGE(Inventor)
     FIND_PACKAGE(Jasper)
-    FIND_PACKAGE(OpenEXR)
+    FIND_PACKAGE(OpenEXR CONFIG)
     FIND_PACKAGE(OpenCascade)
     FIND_PACKAGE(COLLADA)
     FIND_PACKAGE(FBX)
--- a/src/osgPlugins/CMakeLists.txt
+++ src/osgPlugins/CMakeLists.txt
@@ -105,7 +105,7 @@ ENDIF()
 IF(JASPER_FOUND)
     ADD_PLUGIN_DIRECTORY(jp2)
 ENDIF()
-IF(OPENEXR_FOUND AND ZLIB_FOUND AND OSG_CPP_EXCEPTIONS_AVAILABLE)
+IF(OpenEXR_FOUND AND ZLIB_FOUND AND OSG_CPP_EXCEPTIONS_AVAILABLE)
     ADD_PLUGIN_DIRECTORY(exr)
 ENDIF()
 IF(GIFLIB_FOUND)
--- a/src/osgPlugins/exr/CMakeLists.txt
+++ src/osgPlugins/exr/CMakeLists.txt
@@ -1,9 +1,7 @@
-INCLUDE_DIRECTORIES( ${ILMBASE_INCLUDE_DIR}/OpenEXR )
-INCLUDE_DIRECTORIES( ${OPENEXR_INCLUDE_DIR}/OpenEXR )
-
 SET(TARGET_SRC ReaderWriterEXR.cpp )
 
-SET(TARGET_LIBRARIES_VARS ${OPENEXR_LIBRARIES_VARS} ${ILMBASE_LIBRARIES_VARS} ZLIB_LIBRARIES)
+SET(OPENEXR_LIBRARIES_VARS OpenEXR::OpenEXR)
+SET(TARGET_LIBRARIES_VARS OPENEXR_LIBRARIES_VARS ZLIB_LIBRARIES)
 
 IF(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
     REMOVE_CXX_FLAG(-Wshadow)
--- a/src/osgPlugins/exr/ReaderWriterEXR.cpp
+++ src/osgPlugins/exr/ReaderWriterEXR.cpp
@@ -41,11 +41,11 @@ public:
       {
         return _inStream->read(c,n).good();
       };
-      virtual Int64    tellg ()
+      virtual uint64_t    tellg ()
       {
           return _inStream->tellg();
       };
-      virtual void    seekg (Int64 pos)
+      virtual void    seekg (uint64_t pos)
       {
         _inStream->seekg(pos);
       };
@@ -69,11 +69,11 @@ public:
       {
         _outStream->write(c,n);
       };
-      virtual Int64    tellp ()
+      virtual uint64_t    tellp ()
       {
         return _outStream->tellp();
       };
-      virtual void seekp (Int64 pos)
+      virtual void seekp (uint64_t pos)
       {
         _outStream->seekp(pos);
       };