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diff --git a/libgimpwidgets/gimpeevl.h b/libgimpwidgets/gimpeevl.h
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+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * gimpeevl.h
+ * Copyright (C) 2008-2009 Fredrik Alstromer <roe@excu.se>
+ * Copyright (C) 2008-2009 Martin Nordholts <martinn@svn.gnome.org>
+ *
+ * This library is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see
+ * <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_EEVL_H__
+#define __GIMP_EEVL_H__
+
+G_BEGIN_DECLS
+
+
+/**
+ * GimpEevlQuantity:
+ * @value:     In reference units.
+ * @dimension: in has a dimension of 1, in^2 has a dimension of 2 etc
+ */
+typedef struct
+{
+  gdouble value;
+  gint dimension;
+} GimpEevlQuantity;
+
+
+/**
+ * GimpEevlUnitResolverProc:
+ * @identifier: Identifier of unit to resolve or %NULL if default unit
+ *              should be resolved.
+ * @factor:     Units per reference unit. For example, in GIMP the
+ *              reference unit is inches so resolving "mm" should
+ *              return 25.4 since there are 25.4 millimeters per inch.
+ * @offset:     Offset to apply after scaling the value according to @factor.
+ * @data:       Data given to gimp_eevl_evaluate().
+ *
+ * Returns: If the unit was successfully resolved or not.
+ *
+ */
+typedef gboolean (* GimpEevlUnitResolverProc) (const gchar      *identifier,
+                                               GimpEevlQuantity *factor,
+                                               gdouble          *offset,
+                                               gpointer          data);
+
+
+/**
+ * GimpEevlOptions:
+ * @unit_resolver_proc: Unit resolver callback.
+ * @data:               Data passed to unit resolver.
+ * @ratio_expressions:  Allow ratio expressions
+ * @ratio_invert:       Invert ratios
+ * @ratio_quantity:     Quantity to multiply ratios by
+ */
+typedef struct
+{
+  GimpEevlUnitResolverProc unit_resolver_proc;
+  gpointer                 data;
+
+  gboolean                 ratio_expressions;
+  gboolean                 ratio_invert;
+  GimpEevlQuantity         ratio_quantity;
+} GimpEevlOptions;
+
+#define GIMP_EEVL_OPTIONS_INIT                                                 \
+  ((const GimpEevlOptions)                                                     \
+  {                                                                            \
+    .unit_resolver_proc = NULL,                                                \
+    .data               = NULL,                                                \
+                                                                               \
+    .ratio_expressions  = FALSE,                                               \
+    .ratio_invert       = FALSE,                                               \
+    .ratio_quantity     = {0.0, 0}                                             \
+  })
+
+
+gboolean gimp_eevl_evaluate (const gchar            *string,
+                             const GimpEevlOptions  *options,
+                             GimpEevlQuantity       *result,
+                             const gchar           **error_pos,
+                             GError                **error);
+
+
+G_END_DECLS
+
+#endif /* __GIMP_EEVL_H__ */