'isnan' function is failing in linux

isnan function is failing in Linux due to latest c++ standard in compiler. I am using Lubuntu 16.04.
The following error message is coming while building 'Lib'.
error: ‘isnan’ was not declared in this scope.
isnan was used in Lib/src/public/System/support/valuetypes.h file at two places(Line no: 60 & 75).
I changed isnan to std::isnan to get rid of this error.
could you please fix this.

[chris-english]

This change of lines 60 & 75 from isnan to std::isnan, with
export ALTERNATIVE_TOOLS_PATH=$HOME/Alter-Native/Tools
as the CMAKE-CXX11.cmake is in Tools, not AlterNative.Tools as ./alternative-lib-compile.sh suggests.
For those watching build success - it looks different than you'd expect with 1%'s successively, but each build is upon a different object, and hence success.