[gimp] Update INSTALL.in - gexiv2 required version

[Jehan <jehanp src gnome org>]

commit c04544c3dbf19009195a55295776e50ae6c6bc07
Author: d.j.a.y <d j a y free fr>
Date:   Thu Aug 30 16:19:19 2018 +0000

    Update INSTALL.in - gexiv2 required version

 INSTALL.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/INSTALL.in b/INSTALL.in
index 36d8b88b7a..f802889c68 100644
--- a/INSTALL.in
+++ b/INSTALL.in
@@ -71,7 +71,7 @@ header files installed.
   7. The file-compressor plug-in requires zlib, libbzip2, and liblzma to
      be installed. All these libraries are required dependencies.
 
-  8. For metadata access GIMP requires the gexiv2 library. It is hosted
+  8. For metadata access GIMP requires the gexiv2 @GEXIV2_REQUIRED_VERSION@ or newer library. It is hosted
      at https://wiki.gnome.org/Projects/gexiv2 .
 
   9. libpng, libjpeg, libtiff and lcms are hard dependencies that can