#include <fstream>
#include <string>
+#include <iostream>
// forward declaration
class pkgCacheFile;
APT_PUBLIC extern std::ofstream devnull;
APT_PUBLIC extern unsigned int ScreenWidth;
-APT_PUBLIC bool InitOutput();
+APT_PUBLIC bool InitOutput(std::basic_streambuf<char> * const out = std::cout.rdbuf());
void ListSingleVersion(pkgCacheFile &CacheFile, pkgRecords &records,
pkgCache::VerIterator const &V, std::ostream &out,