fixme

[reid@…]

THREADING=multi is the default. mapnik r469 fails to build with:

136 [reid@magnify mapnik-svn]$ python scons/scons.py
scons: Reading SConscript files ...
Building on Linux ...
Checking for main() in C library m... yes
Checking for main() in C library ltdl... yes
Checking for main() in C library png... yes
Checking for main() in C library tiff... yes
Checking for main() in C library z... yes
Checking for main() in C library jpeg... yes
Checking for main() in C library proj... yes
Checking for main() in C library pq... no
Checking for main() in C++ library boost_thread-mt... no
Could not find header or shared library for boost thread, exiting!