From 89c10f989d8da6474a342dbef9a5f712ea02ab5d Mon Sep 17 00:00:00 2001
From: Vasily Efimov <real@ispras.ru>
Date: Fri, 1 Sep 2023 23:21:08 +0300
Subject: [PATCH] Fixup building on Ubuntu 18.04
MIME-Version: 1.0
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Build errors examples:

```
../src/utils/util.h:17:19: error: ‘isnan’ is not a member of ‘std’
         if (!std::isnan(v1) && !std::isnan(v2)) return qMin<double>(v1, v2);
                   ^~~~~
```

```
../src/tables/heightmaptablemodel.cpp:20:24: error: ‘NAN’ was not declared in this scope
             row.append(NAN);
                        ^~~
```
---
 src/tables/heightmaptablemodel.cpp | 1 +
 src/utils/util.h                   | 1 +
 2 files changed, 2 insertions(+)

diff --git a/src/tables/heightmaptablemodel.cpp b/src/tables/heightmaptablemodel.cpp
index 43d424db0..d0ff8ebbe 100644
--- a/src/tables/heightmaptablemodel.cpp
+++ b/src/tables/heightmaptablemodel.cpp
@@ -2,6 +2,7 @@
 // Copyright 2015 Hayrullin Denis Ravilevich
 
 #include "heightmaptablemodel.h"
+#include <cmath>
 
 HeightMapTableModel::HeightMapTableModel(QObject *parent) : QAbstractTableModel(parent)
 {
diff --git a/src/utils/util.h b/src/utils/util.h
index e69480845..47996fc55 100644
--- a/src/utils/util.h
+++ b/src/utils/util.h
@@ -8,6 +8,7 @@
 #include <QVector3D>
 #include <QEventLoop>
 #include <QTimer>
+#include <cmath>
 
 class Util
 {