[Haskell-cafe] containers license issue

[Dmitry Kulagin]

Hi Cafe,

I am faced with unpleasant problem. The lawyer of my company checked
sources of containers package and found out that it refers to some
GPL-library.

Here is quote:
"The algorithm is derived from Jorg Arndt's FXT library"
in file Data/IntMap/Base.hs

The problem is that FXT library is GPL and thus containers package can not
be considered as BSD3. And it means that it can not be used in my case
(closed source software).

Is this logic actually correct and containers should be considered as GPL?

The package is widely used by other packages and the only way I see right
now is to fix sources to reimplement this functionality, which is not good
option.

Thank you!
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