yuki-koyama/sequential-line-search

Build error on Ubuntu (isnan)

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yuki-koyama commented 
/root/sequential-line-search/demos/bayesian_optimization_1d_gui/mainwidget.cpp: In member function ‘virtual void MainWidget::paintEvent(QPaintEvent*)’:
/root/sequential-line-search/demos/bayesian_optimization_1d_gui/mainwidget.cpp:56:26: error: ‘isnan’ was not declared in this scope
     if (!isnan(core.y_max))
                          ^