[GRASS-user] Oblique Equidistant Cylindrical / Equirectangular projection

[Thomas Wootten]

I want to project some data into an Oblique Equidistant Cylindrical (AKA 
Equirectangular) projection. Proj.4 itself understands the following 
parameters string

+proj=ob_tran +o_proj=eqc +o_alpha=315 +a=9213000 +b=9213000 +no_defs 
+units=m

(Whether it actually gives the desired projection is another matter. 
Also the ellipsoid dimensions are funny because this is for a fictional 
extrasolar planet, not Earth.)

But GRASS just gives "ERROR: Can't parse PROJ.4-style parameter string"

How can I make this projection work in GRASS?