Index: kioslave/thumbnail/configure.in.in
===================================================================
--- kioslave/thumbnail/configure.in.in	(revision 434549)
+++ kioslave/thumbnail/configure.in.in	(working copy)
@@ -95,6 +95,18 @@
   AC_SUBST(EXR_FLAGS)
 ])
 
-AC_FIND_LIBEXR
+AC_ARG_WITH(openexr,
+  [AS_HELP_STRING(--with-openexr,
+    [enable support for OpenEXR @<:@default=check@:>@])],
+  [], with_openexr=check)
+
+if test "x$with_openexr" != xno; then
+  AC_FIND_LIBEXR
+
+  if test "x$with_openexr" != xcheck && test -z "$LIB_EXR"; then
+    AC_MSG_FAILURE([--with-openexr was given, but test for OpenEXR failed])
+  fi
+fi
+
 AM_CONDITIONAL(include_EXR_MODULES, test -n "$LIB_EXR")