TRootanaDisplay.cxx lacks math.h

[Matteo Dessalvi]

Hello.

I have just encountered a compilation error of the aforementioned class due to the lack of the math.h header file.

Without 'math.h' I got the following error:

'fabs' was not declared in this scope (...)

Compiler: g++ (4.7.2) Linux Debian Wheezy (64 bit)

Best regards, Matteo Dessalvi

[Thomas Lindner]

Committed bug fix with necessary include file.