remove exr requirement

Author: michaeldsmith

src/apps/CMakeLists.txt

@@ -58,16 +58,19 @@ if( OJPH_ENABLE_OPENEXR_SUPPORT )
     set(USE_OPENEXR TRUE CACHE BOOL "Add OpenEXR support")
     add_definitions(-DOJPH_ENABLE_OPENEXR_SUPPORT)
   else()
-    find_package(IlmBase REQUIRED)
+    find_package(IlmBase)
     if(IlmBase_FOUND)
       message(STATUS "Found IlmBase ${IlmBase_VERSION}")
+
+      find_package(OpenEXR 2)
+      if(OpenEXR_FOUND)
+        message(STATUS "Found OpenEXR ${OpenEXR_VERSION}")
+        set(USE_OPENEXR TRUE CACHE BOOL "Add OpenEXR support")
+        add_definitions(-DOJPH_ENABLE_OPENEXR_SUPPORT)
+      endif()
+
     endif()
-    find_package(OpenEXR 2 REQUIRED)
-    if(OpenEXR_FOUND)
-      message(STATUS "Found OpenEXR ${OpenEXR_VERSION}")
-      set(USE_OPENEXR TRUE CACHE BOOL "Add OpenEXR support")
-      add_definitions(-DOJPH_ENABLE_OPENEXR_SUPPORT)
-    endif()
+    
   endif()
 
 endif()