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SUNWspro is the unbundled compiler, an optional payware
package, see

http://www.sun.com/forte/cplusplus/index.html

If you don't have it, you can't find it :-)

I believe this package is the only way to obtain
libsunmath.so (it's actually SPROsmsx), and that libsunmath
is required for proper operation of fpectl on Solaris.

So if libsunmath is not found, this module should not be built.