Can't find unistd.h ...

From: fpiemon (fpiemon_at_[hidden])
Date: 2003-09-26 09:13:07

Hi

I am able to build the jam source, but have problems building boost 
and in particular the boost graph library which I need. If I try to 
build using c++ borland 6, as follows 
<boostroot>\libs\graph\build\> bjam -sTOOLS=borland
I get a number of errors including this one which is the first

Error E2209 ../src\graphviz_graph_lex.cpp 15: Unable to open include 
file 'unistd.h'

If I try building using microsoft visual c++ 6, as follows
<boostroot>\libs\graph\build\> bjam -sTOOLS=msvc

vc-C++ ..\..\..\libs\graph\build\bin\liblibbgl-
viz.lib\msvc\debug\inlining-on\runtime-link-
dynamic\graphviz_graph_parser.obj graphviz_graph_parser.cpp
graphviz_parser.y(44) : fatal error C1189: #error : Need to define 
the GRAPHVIZ_GRAPH macro to either GraphvizGraph or GraphvizDigraph.

Does anybody know what I am doing wrong ?
Many thanks
Fabio