[Proj] Geo Transfoms and calculations

[Charles Wilson]

Eric Miller wrote:
> You need only a minor modification to Gerald's libproj4 to compile on
> windows.  Because Microsoft is lame, their math library does not include
> atanh (or asinh or acosh). 
> 
> Since Gerald has since embraced the GSL, maybe we can get him to use
> the GSL versions of those functions and let the GNU folks handle
> platform compatibility.

And what happens when libproj4 is compiled with #define NO_GSL (or
equivalent) to avoid GPL issues?  How much existing libproj4
functionality do you want see locked behind that GSL/GPL barrier?

--
Chuck