Switching to cmath instead of math.h seems to help CentOS 7 builds.

Suggests consideration of moving to more modern include forms. Also
maybe review and simplify include graph.

NOTES

@@ -1,4 +1,8 @@
 
+* 2019-09-23 Version 0.8.2
+
+Replacing math.h with cmath seems to help builds on CentOS 7 and later gcc.
+
 * 2019-09-22 Version 0.8.1
 
 Made change to STARE.h not STARE.h.in in 0.8.0 that

VERSION

@@ -1 +1 @@
-0.8.1
+0.8.2

include/General.h

@@ -11,7 +11,7 @@
 #define INCLUDE_GENERAL_H_
 
 #include <cstdint>
-#include <math.h>
+#include <cmath>
 
 int firstBitDifferenceFromLeft(int64_t i0, int64_t i1);
 

include/SpatialGeneral.h

@@ -47,7 +47,8 @@
  TODO Explore using uint64 instead of uint32...
  */
 
-#include <math.h>
+//#include <math.h>
+#include <cmath>
 //#include <stdio.h>
 //#include <iostream>
 #include <vector>

include/SpatialIndex.h

@@ -17,7 +17,7 @@
 //#	    Sept 9, 2002 : Gyorgy Fekete -- added setMaxlevel()
 //#
 
-#include <math.h>
+#include <cmath>
 #include <stdio.h>
 #include <string.h>
 #include <time.h>

include/SpatialVector.h

@@ -17,7 +17,8 @@
 //#     Oct 18, 2001 : Dennis C. Dinge -- Replaced ValVec with std::vector
 //#
 
-#include <math.h>
+//#include <math.h>
+#include <cmath>
 #include <stdio.h>
 #include <iostream>
 #include <SpatialGeneral.h>

src/SpatialIndex.cpp

@@ -32,7 +32,7 @@
 #endif
 
 #include <stdio.h>
-#include <math.h>
+#include <cmath>
 // ===========================================================================
 //
 // Macro definitions for readability

src/SpatialInterface.cpp

@@ -18,7 +18,7 @@
 #include "SpatialInterface.h"
 #include "string.h"
 #include "stdlib.h"
-#include "math.h"
+#include <cmath>
 #include <iomanip> // setw
 
 #define MAX_RANGES 100