I get multiply defined symbols using templates
==============================================

   You may be running into a bug that was introduced in version 2.6.1
(and is still present in 2.6.3) that generated external linkage for
templates even when neither `-fexternal-templates' nor
`-fno-implicit-templates' is specified.  There is a patch for this
problem at
`ftp://ftp.cygnus.com/pub/g++/gcc-2.6.3-template-fix'.

   I recommend either applying the patch or using
`-fno-implicit-templates' together with explicit template instantiation
as described in previous sections.

   This bug is fixed in 2.7.0.