sh flags

[Alec Solway]

Hi,

I'm somewhat new to gcc, I am getting the following error :

categories.cpp: In function `void DisplayCategoriesSearchform(class string, 
class string, class fstream &)':
categories.cpp:131: `sh_read' is not a member of type `filebuf'

in reference to

ifstream fin(cat.c_str(),ios_base::in,filebuf::sh_read);


Where are the sh flags specified? This compiles correctly with Microsoft 
VC++ under Windows.

Regards,
Alec