Log Message:
Update to latest release, 0.4.0. From ChangeLog:

gipfel-0.4.0
* Fix compilation with fltk-1.3.x.
* Use proper distance for distortion correction.
* Don't update coordinates of marked hills.
* Remove compute button.
  Positions are now updated automatically when marked hills are moved.
* Fix focal length for images in portrait format.
* Fix up/down keys in viewpoint chooser.