diff --git a/CMakeLists.txt b/CMakeLists.txt
index 95db47bc7..a75528373 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,9 +15,11 @@ add_definitions(-DIVAN_VERSION="${PROJECT_VERSION}" -DUSE_SDL)
 option(BUILD_MAC_APP "Build standalone application for MacOS" OFF)
 option(USE_HOME_FOR_STATE_DIR "Statedir will be /.ivan/ in current user's homedir" OFF)
 option(WIZARD "Enable Wizard Mode" OFF)
+option(PORTABLE_BUILD "Keep game and user data in the directory IVAN is launched from" OFF)
 
 if(UNIX)
   add_definitions(-DUNIX)
+  if(NOT PORTABLE_BUILD)
   include(GNUInstallDirs)
 
   if(BUILD_MAC_APP)
@@ -37,6 +39,7 @@ if(UNIX)
               " please move them to \"$ENV{HOME}/.ivan\".")
     endif()
   endif()
+  endif()
 
 elseif(WIN32)
   install(DIRECTORY Graphics Script Music Sound DESTINATION "ivan")
@@ -63,6 +66,10 @@ if(WIZARD)
   add_definitions(-DWIZARD)
 endif()
 
+if(PORTABLE_BUILD)
+  add_definitions(-DPORTABLE_BUILD)
+endif()
+
 find_path(EXECINFO_INCLUDE_DIR NAMES execinfo.h)
 if(NOT EXECINFO_INCLUDE_DIR MATCHES "-NOTFOUND$")
   add_definitions(-DBACKTRACE)
diff --git a/FeLib/Include/fearray.h b/FeLib/Include/fearray.h
index a68072efd..c01862176 100644
--- a/FeLib/Include/fearray.h
+++ b/FeLib/Include/fearray.h
@@ -45,9 +45,9 @@ template <class type>
 inline fearray<type>::fearray(const type* Array, sizetype Size)
 : Size(Size)
 {
-  char* Ptr = new char[Size * sizeof(type) + sizeof(int*)];
+  char* Ptr = new char[Size * sizeof(type) + sizeof(ulong)];
   *reinterpret_cast<ulong*>(Ptr) = 0;
-  Data = reinterpret_cast<type*>(Ptr + sizeof(int*));
+  Data = reinterpret_cast<type*>(Ptr + sizeof(ulong));
 
   for(sizetype c = 0; c < Size; ++c)
     new(&Data[c]) type(Array[c]);
diff --git a/FeLib/Include/hscore.h b/FeLib/Include/hscore.h
index dc2e3072f..586bfb976 100644
--- a/FeLib/Include/hscore.h
+++ b/FeLib/Include/hscore.h
@@ -18,6 +18,10 @@
 
 #include "festring.h"
 
+#ifdef PORTABLE_BUILD
+#define HIGH_SCORE_FILENAME "ivan-highscore.scores"
+#else
+
 #ifdef UNIX
 #define HIGH_SCORE_FILENAME "ivan-highscore.scores"
 #endif
@@ -25,6 +29,7 @@
 #if defined(WIN32) || defined(__DJGPP__)
 #define HIGH_SCORE_FILENAME "HScore.dat"
 #endif
+#endif
 
 class festring;
 
diff --git a/FeLib/Include/save.h b/FeLib/Include/save.h
index f92fad191..de2cff4cc 100644
--- a/FeLib/Include/save.h
+++ b/FeLib/Include/save.h
@@ -229,8 +229,41 @@ inline inputfile& operator>>(inputfile& SaveFile, ushort& Value)
   return SaveFile;
 }
 
+/* SAVE_COMPATIBILITY:
+ * make x86_64-w64-mingw32 saves compatible with Linux,
+ * by forcing the correct sizes.
+ * Note: This also lets us save 64-bit time_t values.
+ **/
+
+#if SAVE_COMPATIBILITY
+#include <stdint.h>
+RAW_SAVE_LOAD(int64_t)
+RAW_SAVE_LOAD(uint64_t)
+
+inline outputfile& operator<<(outputfile& SaveFile, long Value)
+{
+  int64_t Value2 = Value; return SaveFile << Value2;
+}
+
+inline inputfile& operator>>(inputfile& SaveFile, long& Value)
+{
+  int64_t Value2; SaveFile >> Value2; Value = Value2; return SaveFile;
+}
+
+inline outputfile& operator<<(outputfile& SaveFile, ulong Value)
+{
+  uint64_t Value2 = Value; return SaveFile << Value2;
+}
+
+inline inputfile& operator>>(inputfile& SaveFile, ulong& Value)
+{
+  uint64_t Value2; SaveFile >> Value2; Value = Value2; return SaveFile;
+}
+
+#else
 RAW_SAVE_LOAD(long)
 RAW_SAVE_LOAD(ulong)
+#endif
 RAW_SAVE_LOAD(int)
 RAW_SAVE_LOAD(uint)
 RAW_SAVE_LOAD(double)
diff --git a/FeLib/Source/feio.cpp b/FeLib/Source/feio.cpp
index be34ae64e..070cca9d9 100644
--- a/FeLib/Source/feio.cpp
+++ b/FeLib/Source/feio.cpp
@@ -22,13 +22,22 @@
 #include <cstring>
 #include <vector>
 
+#if defined(UNIX) || defined(USE_OPENDIR)
+#include <dirent.h>
+#else
+
 #ifdef WIN32
 #define stat _stat
 #include <io.h>
 #endif
 
+#ifdef __DJGPP__
+#include <dir.h>
+#endif
+
+#endif
+
 #ifdef UNIX
-#include <dirent.h>
 #include <stddef.h>
 #include <cstdio>
 #include <time.h>
@@ -37,9 +46,6 @@
 #include <sstream>
 #endif
 
-#ifdef __DJGPP__
-#include <dir.h>
-#endif
 
 #include "bitmap.h"
 #include "error.h"
@@ -1044,7 +1050,7 @@ festring iosystem::ContinueMenu(col16 TopicColor, col16 ListColor,
   felist List(CONST_S("Choose a file and be sorry:"), TopicColor);
 
   ////////////////////////// OS SPECIFIC!!! collect all files at save folder. //////////////////////////
-#ifdef UNIX
+#if defined(UNIX) || defined(USE_OPENDIR)
   {
     DIR* dp;
     struct dirent* ep;
@@ -1055,7 +1061,7 @@ festring iosystem::ContinueMenu(col16 TopicColor, col16 ListColor,
       closedir(dp);
     }
   }
-#endif
+#else
 
 #ifdef WIN32
   struct _finddata_t Found;
@@ -1091,6 +1097,7 @@ festring iosystem::ContinueMenu(col16 TopicColor, col16 ListColor,
       Check = findnext(&Found);
     }
   }
+#endif
 #endif
 
   if(vFiles.size()==0){
diff --git a/FeLib/Source/femath.cpp b/FeLib/Source/femath.cpp
index 6a8310450..4c03355fb 100644
--- a/FeLib/Source/femath.cpp
+++ b/FeLib/Source/femath.cpp
@@ -315,26 +315,22 @@ void ReadData(region& R, inputfile& SaveFile)
 
 outputfile& operator<<(outputfile& SaveFile, const interval& I)
 {
-  SaveFile.Write(reinterpret_cast<cchar*>(&I), sizeof(I));
-  return SaveFile;
+  return SaveFile << I.Min << I.Max;
 }
 
 inputfile& operator>>(inputfile& SaveFile, interval& I)
 {
-  SaveFile.Read(reinterpret_cast<char*>(&I), sizeof(I));
-  return SaveFile;
+  return SaveFile >> I.Min >> I.Max;
 }
 
 outputfile& operator<<(outputfile& SaveFile, const region& R)
 {
-  SaveFile.Write(reinterpret_cast<cchar*>(&R), sizeof(R));
-  return SaveFile;
+  return SaveFile << R.X << R.Y;
 }
 
 inputfile& operator>>(inputfile& SaveFile, region& R)
 {
-  SaveFile.Read(reinterpret_cast<char*>(&R), sizeof(R));
-  return SaveFile;
+  return SaveFile >> R.X >> R.Y;
 }
 
 long femath::SumArray(const fearray<long>& Vector)
diff --git a/FeLib/Source/festring.cpp b/FeLib/Source/festring.cpp
index 6d26138ce..9c7df0bc4 100644
--- a/FeLib/Source/festring.cpp
+++ b/FeLib/Source/festring.cpp
@@ -884,7 +884,7 @@ long festring::GetCheckSum() const
 void festring::CreateNewData(sizetype N)
 {
   Reserved = N|FESTRING_PAGE;
-  Data = sizeof(int*) + new char[Reserved + sizeof(int*) + 1];
+  Data = sizeof(ulong) + new char[Reserved + sizeof(ulong) + 1];
   OwnsData = true;
   REFS(Data) = 0;
   Size = 0;
diff --git a/FeLib/Source/save.cpp b/FeLib/Source/save.cpp
index 507c636b7..bde90def6 100644
--- a/FeLib/Source/save.cpp
+++ b/FeLib/Source/save.cpp
@@ -811,6 +811,9 @@ void MakePath(cfestring& Path)
 
 festring GetUserDataDir()
 {
+#ifdef PORTABLE_BUILD
+  return "./";
+#else
 #ifdef UNIX
   festring Dir;
 #ifdef MAC_APP
@@ -834,4 +837,5 @@ festring GetUserDataDir()
 #if defined(WIN32) || defined(__DJGPP__)
   return "./";
 #endif
+#endif
 }
diff --git a/Main/Include/square.h b/Main/Include/square.h
index 3ad331e4d..38365b258 100644
--- a/Main/Include/square.h
+++ b/Main/Include/square.h
@@ -39,7 +39,7 @@ class square
   area* GetArea() const { return AreaUnder; }
   virtual gterrain* GetGTerrain() const = 0;
   virtual oterrain* GetOTerrain() const = 0;
-  festring GetMemorizedDescription() { return MemorizedDescription; }
+  festring GetMemorizedDescription() const { return MemorizedDescription; }
   void SetMemorizedDescription(cfestring& What) { MemorizedDescription = What; }
   virtual truth CanBeSeenByPlayer(truth = false) const = 0;
   virtual truth CanBeSeenFrom(v2, long, truth = false) const = 0;
diff --git a/Main/Include/trap.h b/Main/Include/trap.h
index 082f3fa50..711b66045 100644
--- a/Main/Include/trap.h
+++ b/Main/Include/trap.h
@@ -47,6 +47,7 @@ class itemtrapbase
 {
  public:
   itemtrapbase() : Active(false) { }
+  virtual ~itemtrapbase() { }
   void Save(outputfile&) const;
   void Load(inputfile&);
   void SetIsActive(truth);
diff --git a/Main/Source/bugworkaround.cpp b/Main/Source/bugworkaround.cpp
index 9dcf562f2..7dcf99751 100644
--- a/Main/Source/bugworkaround.cpp
+++ b/Main/Source/bugworkaround.cpp
@@ -428,7 +428,7 @@ character* bugfixdp::ValidatePlayerAt(square* sqr)
 
   if(vPF.size()>1){ // FIRST CHECK/FIX!
     festring fsMsg;
-    fsMsg << "Multiple player instances found (x" << vPF.size() << "), try to fix this?";
+    fsMsg << "Multiple player instances found (x" << int(vPF.size()) << "), try to fix this?";
     if(AlertConfirmFixMsg(fsMsg.CStr()))
       return BugWorkaroundDupPlayer();
     /**
diff --git a/Main/Source/cmdcraft.cpp b/Main/Source/cmdcraft.cpp
index 7b2a5d040..9ca3ccac1 100644
--- a/Main/Source/cmdcraft.cpp
+++ b/Main/Source/cmdcraft.cpp
@@ -3062,7 +3062,7 @@ void updateCraftDesc(){
 
   festring fsDesc=fsSkill;
   if(vSuspended.size()>0)
-    fsDesc<<" (Suspended Actions: "<<vSuspended.size()<<")";
+    fsDesc<<" (Suspended Actions: "<<int(vSuspended.size())<<")";
 
   craftRecipes.AddDescription(fsDesc,fSkill<10?RED:WHITE);
 }
diff --git a/Main/Source/game.cpp b/Main/Source/game.cpp
index 2b37ec797..79e4db8a5 100644
--- a/Main/Source/game.cpp
+++ b/Main/Source/game.cpp
@@ -5304,6 +5304,9 @@ inputfile& operator>>(inputfile& SaveFile, dangerid& Value)
 
 festring game::GetDataDir()
 {
+#ifdef PORTABLE_BUILD
+  return "./";
+#else
 #ifdef UNIX
 #ifdef MAC_APP
   return "../Resources/data/";
@@ -5315,6 +5318,7 @@ festring game::GetDataDir()
 #if defined(WIN32) || defined(__DJGPP__)
   return GetUserDataDir();
 #endif
+#endif
 }
 
 festring game::GetSaveDir()
diff --git a/Main/Source/lsquare.cpp b/Main/Source/lsquare.cpp
index d07aa1dbe..e7c51a68e 100644
--- a/Main/Source/lsquare.cpp
+++ b/Main/Source/lsquare.cpp
@@ -1398,14 +1398,12 @@ void lsquare::KickAnyoneStandingHereAway()
 
 outputfile& operator<<(outputfile& SaveFile, const emitter& Emitter)
 {
-  SaveFile.Write(reinterpret_cast<cchar*>(&Emitter), sizeof(Emitter));
-  return SaveFile;
+  return SaveFile << Emitter.ID << Emitter.Emitation;
 }
 
 inputfile& operator>>(inputfile& SaveFile, emitter& Emitter)
 {
-  SaveFile.Read(reinterpret_cast<char*>(&Emitter), sizeof(Emitter));
-  return SaveFile;
+  return SaveFile >> Emitter.ID >> Emitter.Emitation;
 }
 
 void lsquare::AddItem(item* Item)
diff --git a/xbrzscale/libxbrzscale.h b/xbrzscale/libxbrzscale.h
index 64aeb4179..e2442f819 100644
--- a/xbrzscale/libxbrzscale.h
+++ b/xbrzscale/libxbrzscale.h
@@ -16,6 +16,9 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#ifndef _XRBZSCALE_
+#define _XRBZSCALE_
+
 #ifndef XBRZLIB_RELATIVEPATHSDL
 #include <SDL_stdinc.h>
 #else
@@ -49,3 +52,4 @@ class libxbrzscale
   static bool bFreeInputSurfaceAfterScale;
   static bool bFreeOutputSurfaceAfterScale;
 };
+#endif
\ No newline at end of file