help with g++-4.3 (headers)

[Neal Becker]

I don't have g++-4.3 installed.  When building ipython:
walktrap_graph.cpp: In member function 'void Graph::convert_from_igraph(const igraph_t*, const igraph_vector_t*)':
walktrap_graph.cpp:167: error: 'sort' was not declared in this scope
walktrap_graph.cpp: In member function 'long int Graph::memory()':
walktrap_graph.cpp:190: error: 'strlen' was not declared in this scope

I tried adding:
#include <cstring>
#include <algorithm>

and using std::sort, std::strlen.  Any ideas?