diff -urN a/operations/external/exr-save.cc b/operations/external/exr-save.cc
--- a/operations/external/exr-save.cc	2018-07-11 23:15:19.000000000 +0100
+++ b/operations/external/exr-save.cc	2018-08-22 19:13:26.241432231 +0100
@@ -145,10 +145,10 @@
                           &blue[0], &blue[1],
                           NULL, NULL, NULL);
     {
-    Imf::Chromaticities c1 (Imath_2_2::V2f(red[0],red[1]),
-                            Imath_2_2::V2f(green[0],green[1]),
-                            Imath_2_2::V2f(blue[0],blue[1]),
-                            Imath_2_2::V2f(wp[0],wp[1]));
+    Imf::Chromaticities c1 (Imath::V2f(red[0],red[1]),
+                            Imath::V2f(green[0],green[1]),
+                            Imath::V2f(blue[0],blue[1]),
+                            Imath::V2f(wp[0],wp[1]));
     Imf::addChromaticities (header, c1);
     }
   }
@@ -184,10 +184,10 @@
                            &green[0], &green[1],
                            &blue[0], &blue[1],
                            NULL, NULL, NULL);
-    Imf::Chromaticities c1 (Imath_2_2::V2f(red[0],red[1]),
-                            Imath_2_2::V2f(green[0],green[1]),
-                            Imath_2_2::V2f(blue[0],blue[1]),
-                            Imath_2_2::V2f(wp[0],wp[1]));
+    Imf::Chromaticities c1 (Imath::V2f(red[0],red[1]),
+                            Imath::V2f(green[0],green[1]),
+                            Imath::V2f(blue[0],blue[1]),
+                            Imath::V2f(wp[0],wp[1]));
     Imf::addChromaticities (header, c1);
   }