Gnumeric does not seem to support XDG Base Directory Specification
Submitted by W. Michael Petullo
The XDG Base Directory Specification defines how an application can set various system paths at runtime.
Supporting this standard will make it possible to integrate gnumeric more tightly into Mac OS X using application bundles and GTK+'s native Mac OS X code. Previous versions of gnumeric supported the -D and -L parameter, setting the program's shared data and library directories, respectively. However, this does not seem to be in 1.9 (though it is listed by --help-all). If reimplementing the feature, the XDG specification might as well be supported instead.
See http://standards.freedesktop.org/basedir-spec/basedir-spec-0.6.html for the XDG Base Directory Standard.
See http://www.flyn.org/apple/index.html for my work with bundling gnumeric for Mac OS X.