How to test for gnu extensions

[Thiago Macieira]

David Faure wrote:
>Currently kdelibs fails to compile for me with cmake because S_ISSOCK
> isn't detected

Where is S_ISSOCK being used?
-- 
  Thiago Macieira  -  thiago (AT) macieira.info - thiago (AT) kde.org
    PGP/GPG: 0x6EF45358; fingerprint:
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5. Swa he géanhwearf tó timbran, and hwonne he cóm, lá! Unix cwæð "Hello, 
World". Ǽfre ǽghwilc wæs glæd and seo woruld wæs fréo.
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