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diff --git a/apt-pkg/algorithms.h b/apt-pkg/algorithms.h
new file mode 100644
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+++ b/apt-pkg/algorithms.h
@@ -0,0 +1,164 @@
+// -*- mode: cpp; mode: fold -*-
+// Description								/*{{{*/
+/* ######################################################################
+
+   Algorithms - A set of misc algorithms
+   
+   This simulate class displays what the ordering code has done and
+   analyses it with a fresh new dependency cache. In this way we can
+   see all of the effects of an upgrade run.
+
+   pkgDistUpgrade computes an upgrade that causes as many packages as
+   possible to move to the newest version.
+   
+   pkgApplyStatus sets the target state based on the content of the status
+   field in the status file. It is important to get proper crash recovery.
+
+   pkgFixBroken corrects a broken system so that it is in a sane state.
+ 
+   pkgAllUpgrade attempts to upgade as many packages as possible but 
+   without installing new packages.
+   
+   The problem resolver class contains a number of complex algorithms
+   to try to best-guess an upgrade state. It solves the problem of 
+   maximizing the number of install state packages while having no broken
+   packages. 
+
+   ##################################################################### */
+									/*}}}*/
+#ifndef PKGLIB_ALGORITHMS_H
+#define PKGLIB_ALGORITHMS_H
+
+
+#include <apt-pkg/packagemanager.h>
+#include <apt-pkg/depcache.h>
+#include <apt-pkg/pkgcache.h>
+#include <apt-pkg/cacheiterators.h>
+
+#include <iostream>
+#include <string>
+
+#include <apt-pkg/macros.h>
+
+#ifndef APT_8_CLEANER_HEADERS
+#include <apt-pkg/acquire.h>
+using std::ostream;
+#endif
+
+#ifndef APT_9_CLEANER_HEADERS
+// include pkg{DistUpgrade,AllUpgrade,MiniizeUpgrade} here for compatibility
+#include <apt-pkg/upgrade.h>
+#include <apt-pkg/update.h>
+#endif
+
+
+class pkgSimulatePrivate;
+class pkgSimulate : public pkgPackageManager				/*{{{*/
+{
+   pkgSimulatePrivate * const d;
+   protected:
+
+   class Policy : public pkgDepCache::Policy
+   {
+      pkgDepCache *Cache;
+      public:
+      
+      virtual VerIterator GetCandidateVer(PkgIterator const &Pkg) APT_OVERRIDE
+      {
+	 return (*Cache)[Pkg].CandidateVerIter(*Cache);
+      }
+      
+      explicit Policy(pkgDepCache *Cache) : Cache(Cache) {};
+   };
+   
+   unsigned char *Flags;
+   
+   Policy iPolicy;
+   pkgDepCache Sim;
+   pkgDepCache::ActionGroup group;
+
+   // The Actual installation implementation
+   virtual bool Install(PkgIterator Pkg,std::string File) APT_OVERRIDE;
+   virtual bool Configure(PkgIterator Pkg) APT_OVERRIDE;
+   virtual bool Remove(PkgIterator Pkg,bool Purge) APT_OVERRIDE;
+
+   // FIXME: trick to avoid ABI break for virtual reimplementation; fix on next ABI break
+public:
+   APT_HIDDEN bool Go2(APT::Progress::PackageManager * progress);
+
+private:
+   APT_HIDDEN void ShortBreaks();
+   APT_HIDDEN void Describe(PkgIterator iPkg,std::ostream &out,bool Current,bool Candidate);
+   APT_HIDDEN bool RealInstall(PkgIterator Pkg,std::string File);
+   APT_HIDDEN bool RealConfigure(PkgIterator Pkg);
+   APT_HIDDEN bool RealRemove(PkgIterator Pkg,bool Purge);
+
+   public:
+
+   explicit pkgSimulate(pkgDepCache *Cache);
+   virtual ~pkgSimulate();
+};
+									/*}}}*/
+class pkgProblemResolver						/*{{{*/
+{
+ private:
+   /** \brief dpointer placeholder (for later in case we need it) */
+   void * const d;
+
+   pkgDepCache &Cache;
+   typedef pkgCache::PkgIterator PkgIterator;
+   typedef pkgCache::VerIterator VerIterator;
+   typedef pkgCache::DepIterator DepIterator;
+   typedef pkgCache::PrvIterator PrvIterator;
+   typedef pkgCache::Version Version;
+   typedef pkgCache::Package Package;
+   
+   enum Flags {Protected = (1 << 0), PreInstalled = (1 << 1),
+               Upgradable = (1 << 2), ReInstateTried = (1 << 3),
+               ToRemove = (1 << 4)};
+   int *Scores;
+   unsigned char *Flags;
+   bool Debug;
+   
+   // Sort stuff
+   APT_HIDDEN int ScoreSort(Package const *A, Package const *B) APT_PURE;
+
+   struct PackageKill
+   {
+      PkgIterator Pkg;
+      DepIterator Dep;
+   };
+
+   APT_HIDDEN void MakeScores();
+   APT_HIDDEN bool DoUpgrade(pkgCache::PkgIterator Pkg);
+
+   protected:
+   bool InstOrNewPolicyBroken(pkgCache::PkgIterator Pkg);
+
+   public:
+   
+   inline void Protect(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= Protected; Cache.MarkProtected(Pkg);};
+   inline void Remove(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= ToRemove;};
+   inline void Clear(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] &= ~(Protected | ToRemove);};
+
+   // Try to intelligently resolve problems by installing and removing packages
+   bool Resolve(bool BrokenFix = false, OpProgress * const Progress = NULL);
+   APT_HIDDEN bool ResolveInternal(bool const BrokenFix = false);
+
+   // Try to resolve problems only by using keep
+   bool ResolveByKeep(OpProgress * const Progress = NULL);
+   APT_HIDDEN bool ResolveByKeepInternal();
+
+   APT_DEPRECATED_MSG("NOOP as MarkInstall enforces not overriding FromUser markings") void InstallProtect();
+
+   explicit pkgProblemResolver(pkgDepCache *Cache);
+   virtual ~pkgProblemResolver();
+};
+									/*}}}*/
+bool pkgApplyStatus(pkgDepCache &Cache);
+bool pkgFixBroken(pkgDepCache &Cache);
+
+void pkgPrioSortList(pkgCache &Cache,pkgCache::Version **List);
+
+
+#endif