=== modified file 'configure.ac'
--- configure.ac	2018-03-25 18:10:52 +0000
+++ configure.ac	2018-05-05 00:30:21 +0000
@@ -57,6 +57,12 @@
             [with_gegl2=yes],
             [with_gegl2=no])
 
+AC_ARG_WITH([gegl-0.4],
+            [AS_HELP_STRING([--with-gegl-0.4],
+              [Use gegl v. 0.4 @<:@default=no@:>@])],
+            [with_gegl4=yes],
+            [with_gegl4=no])
+
 AC_ARG_WITH([exiv2],
             [AS_HELP_STRING([--with-exiv2],
               [Read/write exif metadata @<:@default=yes@:>@])],
@@ -73,15 +79,20 @@
   PKG_CHECK_MODULES([GEGL], [gegl-0.2 >= 0.2.0], [GEGL_PC="gegl-0.2"])
   GEGL_PC="gegl-0.2"
   GEGL_DIR="gegl-0.2"
+elif test x"${with_gegl4}" = xyes; then
+  PKG_CHECK_MODULES([GEGL], [gegl-0.4 >= 0.4.0], [GEGL_PC="gegl-0.4"])
+  GEGL_PC="gegl-0.4"
+  GEGL_DIR="gegl-0.4"
+  GEGL_CHANT="yes"
 else
   PKG_CHECK_MODULES([GEGL], [gegl-0.3 >= 0.3.0], [GEGL_PC="gegl-0.3"])
   GEGL_PC="gegl-0.3"
   GEGL_DIR="gegl-0.3"
 
-  GEGL_3_8="no"
+  GEGL_CHANT="no"
 # From version 0.3.8 on up, gegl-chant.h was deprecated. We
 # have to use insta-curve.c which uses gegl-op.h
-  PKG_CHECK_EXISTS([gegl-0.3 >= 0.3.8], [ GEGL_3_8="yes" ], [])
+  PKG_CHECK_EXISTS([gegl-0.3 >= 0.3.8], [ GEGL_CHANT="yes" ], [])
 fi
 
 ##### Check if we want to read exif data #######################################
@@ -94,7 +105,7 @@
 
 ##### Check if using effects ###################################################
 
-AM_CONDITIONAL([DO_RETRO_FX], [test "$GEGL_3_8" = yes])
+AM_CONDITIONAL([DO_RETRO_FX], [test "$GEGL_CHANT" = yes])
 
 AM_CONDITIONAL([DO_PLUGINS], [test "$with_plugins" = yes])
 

=== modified file 'src/effects.c'
--- src/effects.c	2018-03-28 15:29:25 +0000
+++ src/effects.c	2018-05-05 01:10:56 +0000
@@ -21,6 +21,12 @@
 Some parts from gimp
 */
 
+#if GEGL_MAJOR_VERSION == 0 && GEGL_MINOR_VERSION == 3 && GEGL_MICRO_VERSION >= 8
+  #define USE_INSTA		1
+#elif GEGL_MAJOR_VERSION == 0 && GEGL_MINOR_VERSION == 4
+  #define USE_INSTA		1
+#endif
+
 #if BABL_MAJOR_VERSION == 0 && BABL_MINOR_VERSION <= 1 && BABL_MICRO_VERSION <= 2
 const Babl *fx_get_format_RGB24(void)
 {
@@ -240,7 +246,7 @@
 	g_return_if_fail (GEGL_IS_BUFFER (src_buffer));
 	g_return_if_fail (GEGL_IS_BUFFER (dest_buffer));
 
-#if GEGL_MAJOR_VERSION == 0 && GEGL_MINOR_VERSION == 3 && GEGL_MICRO_VERSION >= 8
+#ifdef USE_INSTA
 	node = gegl_node_new_child (NULL, "operation", op, "preset",
 								GEGL_DIBUJA_INSTA_CURVE_PRESET_1977 ,NULL);
 #else
@@ -260,7 +266,7 @@
 	g_return_if_fail (GEGL_IS_BUFFER (src_buffer));
 	g_return_if_fail (GEGL_IS_BUFFER (dest_buffer));
 
-#if GEGL_MAJOR_VERSION == 0 && GEGL_MINOR_VERSION == 3 && GEGL_MICRO_VERSION >= 8
+#ifdef USE_INSTA
 	node = gegl_node_new_child (NULL, "operation", op, "preset",
 								GEGL_DIBUJA_INSTA_CURVE_PRESET_BRANNAN ,NULL);
 #else

=== modified file 'src/effects.h'
--- src/effects.h	2018-03-29 20:58:36 +0000
+++ src/effects.h	2018-05-05 01:03:42 +0000
@@ -30,8 +30,12 @@
   #include <gegl-0.2/gegl.h>
 extern const gchar * gegl_operation_get_key(const gchar *operation_type,
 											const gchar *key_name);
-#elif GEGL_MAJOR_VERSION == 0 && GEGL_MINOR_VERSION == 3
-  #include <gegl-0.3/gegl.h>
+#elif GEGL_MAJOR_VERSION == 0 && GEGL_MINOR_VERSION >= 3
+  #if GEGL_MINOR_VERSION == 3
+    #include <gegl-0.3/gegl.h>
+  #elif GEGL_MINOR_VERSION == 4
+    #include <gegl-0.4/gegl.h>
+  #endif
 
   typedef enum{
       GEGL_DIBUJA_INSTA_CURVE_PRESET_NONE = 0,

=== modified file 'src/main.c'
--- src/main.c	2018-03-28 15:29:25 +0000
+++ src/main.c	2018-05-05 01:12:41 +0000
@@ -373,7 +373,7 @@
 		dibuja_new_file(NULL, NULL, CANVAS_DEF_WIDTH, CANVAS_DEF_HEIGHT);
 	}
 
-#if GEGL_MAJOR_VERSION == 0 && GEGL_MINOR_VERSION == 3 && GEGL_MICRO_VERSION >= 0
+#if GEGL_MAJOR_VERSION == 0 && GEGL_MINOR_VERSION >= 3
 	g_object_set(gegl_config(), "application-license", "GPL3", NULL);
 #endif
 	gegl_init (&argc, &argv);