Link error with 'node_array' in Visual C++

Hello there,

I get the following link-error when simply trying to define a
node_array, e.g.:

node_array<int> arrNodes;

results in:

readproblem.obj : error LNK2001: unresolved external symbol "void
(__cdecl* leda::std_error_handler)(int,char const *)"
(?std_error_handler@[EMAIL PROTECTED]
)
readproblem.obj : error LNK2001: unresolved external symbol "class
leda::memory_manager leda::std_memory_mgr"
(?std_memory_mgr@[EMAIL PROTECTED]
)
Z:\2clseqQPCNew\2clseqQPCNew\Debug\2clseqQPCNew.exe : fatal error
LNK1120: 2 unresolved externals

While I could prevent using a 'node_array' in ann another context by
using
std::vector<node>,  I cannot prevent using it with the function
'compnum(Graph)'.

(I do not use any other namespace (e.g. std) than using namespace
leda.)

Does anyone know a solution to this problem?
Horst