Bug#820450: yade: FTBFS with glibc 2.23: 'isnan' was not declared in this scope

[Graham Inggs]

Source: yade
Version: 1.20.0-7

Hi Maintainer

Yade FTBFS with glibc 2.23 available in Experimental and Ubuntu Xenial.
I was able to get yade to build in Ubuntu with the attached patch.

There are other occurrences of 'isnan' and 'isinf' inside #ifdefs that I 
did not replace.
I don't know if it would be better to just search & replace inside all 
files, or whether there is a simpler way to fix this.

Regards
Graham


[1] 
https://launchpad.net/ubuntu/+archive/test-rebuild-20160401/+build/9526535/+files/buildlog_ubuntu-xenial-amd64.yade_1.20.0-7_BUILDING.txt.gz

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