diff --git a/configure.cmake b/configure.cmake
index e9c2a3b..3bfdd9b 100644
--- a/configure.cmake
+++ b/configure.cmake
@@ -4,7 +4,7 @@ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_INSTALL_PREFIX}/share/CMake"
 
 
 find_package ( Eigen3        CONFIG REQUIRED )
-find_package ( Imath         CONFIG REQUIRED )
+# find_package ( Imath         CONFIG REQUIRED )
 find_package ( Ceres                REQUIRED )
 find_package ( Boost                REQUIRED
     COMPONENTS
diff --git a/src/rawtoaces_idt/CMakeLists.txt b/src/rawtoaces_idt/CMakeLists.txt
index 62f56df..f9bdf30 100644
--- a/src/rawtoaces_idt/CMakeLists.txt
+++ b/src/rawtoaces_idt/CMakeLists.txt
@@ -16,8 +16,8 @@ target_link_libraries(
         Boost::boost
         Boost::system
         Boost::filesystem
-        Imath::Imath
-        Imath::ImathConfig
+#        Imath::Imath
+#        Imath::ImathConfig
 )
 
 if ( ${Ceres_VERSION_MAJOR} GREATER 1 )
diff --git a/src/rawtoaces_util/acesrender.cpp b/src/rawtoaces_util/acesrender.cpp
index 0a22378..111ef68 100644
--- a/src/rawtoaces_util/acesrender.cpp
+++ b/src/rawtoaces_util/acesrender.cpp
@@ -2027,8 +2027,11 @@ void AcesRender::acesWrite( const char *name, float *aces, float ratio ) const
 
         FORJ( channels * width )
         {
-            Imath::half tmpV( aces[k++] );
-            halfIn[j] = tmpV.bits();
+            Eigen::half h( aces[k++] );
+            //ceres::h
+            //ceres::half;
+            //Imath::half tmpV( aces[k++] );
+            halfIn[j] = *(uint16_t *)(&h);
         }
         x.storeHalfRow( halfIn, i );
     }
diff --git a/unittest/CMakeLists.txt b/unittest/CMakeLists.txt
index f8ca8d9..138dc0f 100644
--- a/unittest/CMakeLists.txt
+++ b/unittest/CMakeLists.txt
@@ -25,8 +25,8 @@ target_link_libraries(
     Test_IDT
     PUBLIC
         ${RAWTOACESLIB}
-        Imath::Imath
-        Imath::ImathConfig
+#        Imath::Imath
+#        Imath::ImathConfig
         Boost::boost
         Boost::filesystem
         Boost::unit_test_framework