diff --git a/src/Make_mvc.mak b/src/Make_mvc.mak
index c070450..9d34633 100644
--- a/src/Make_mvc.mak
+++ b/src/Make_mvc.mak
@@ -817,7 +817,11 @@
 !message Ruby requested (version $(RUBY_VER)) - root dir is "$(RUBY)"
 CFLAGS = $(CFLAGS) -DFEAT_RUBY
 RUBY_OBJ = $(OUTDIR)\if_ruby.obj
+!if $(RUBY_VER) >= 190
+RUBY_INC = /I "$(RUBY)\include\ruby-$(RUBY_VER_LONG)\$(RUBY_PLATFORM)" /I "$(RUBY)\include\ruby-$(RUBY_VER_LONG)"
+!else
 RUBY_INC = /I "$(RUBY)\lib\ruby\$(RUBY_VER_LONG)\$(RUBY_PLATFORM)"
+!endif
 RUBY_LIB = $(RUBY)\lib\$(RUBY_INSTALL_NAME).lib
 # Do we want to load Ruby dynamically?
 !if "$(DYNAMIC_RUBY)" == "yes"
diff --git a/src/Makefile b/src/Makefile
index db38f93..2211ba052 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -404,7 +404,7 @@
 # If both python2.x and python3.x are enabled then the linking will be via
 # dlopen(), dlsym(), dlclose(), i.e. pythonX.Y.so must be available
 #CONF_OPT_PYTHON = --enable-pythoninterp
-#CONF_OPT_PYTHON3 = --enable-python3interp
+CONF_OPT_PYTHON3 = --enable-python3interp
 
 # RUBY
 # Uncomment this when you want to include the Ruby interface.
diff --git a/src/bigvim.bat b/src/bigvim.bat
index ded5bc4..6ba89e6 100644
--- a/src/bigvim.bat
+++ b/src/bigvim.bat
@@ -1,3 +1,3 @@
 :: command to build big Vim with OLE, Perl, Python, Ruby and Tcl
-nmake -f Make_mvc.mak GUI=yes OLE=yes PERL=E:\perl58 DYNAMIC_PERL=yes PERL_VER=58 PYTHON=e:\python24 DYNAMIC_PYTHON=yes PYTHON_VER=24 RUBY=e:\ruby18 DYNAMIC_RUBY=yes RUBY_VER=18 RUBY_VER_LONG=1.8 TCL=e:\tcl DYNAMIC_TCL=yes %1 IME=yes CSCOPE=yes XPM=e:\xpm
+nmake -f Make_mvc.mak GUI=yes OLE=yes PERL=E:\perl512 DYNAMIC_PERL=yes PERL_VER=512 PYTHON=e:\python27 DYNAMIC_PYTHON=yes PYTHON_VER=27 PYTHON3=e:\python31 DYNAMIC_PYTHON3=yes PYTHON3_VER=31 RUBY=e:\ruby191 DYNAMIC_RUBY=yes RUBY_VER=191 RUBY_VER_LONG=1.9.1 TCL=e:\tcl DYNAMIC_TCL=yes %1 IME=yes CSCOPE=yes XPM=e:\xpm
 
diff --git a/src/if_python3.c b/src/if_python3.c
index 5400dc6..410dc14 100644
--- a/src/if_python3.c
+++ b/src/if_python3.c
@@ -321,6 +321,7 @@
 static int py3_runtime_link_init(char *libname, int verbose)
 {
     int i;
+    void *ucs_from_string, *ucs_from_string_and_size;
 
     if (hinstPy3)
 	return OK;
@@ -346,11 +347,8 @@
 	}
     }
 
-    /* load unicode functions separately as only the ucs2 or the ucs4 functions
-     * will be present in the library
-     */
-    void *ucs_from_string, *ucs_from_string_and_size;
-
+    /* Load unicode functions separately as only the ucs2 or the ucs4 functions
+     * will be present in the library. */
     ucs_from_string = symbol_from_dll(hinstPy3, "PyUnicodeUCS2_FromString");
     ucs_from_string_and_size = symbol_from_dll(hinstPy3,
 	    "PyUnicodeUCS2_FromStringAndSize");
@@ -438,7 +436,7 @@
 static void PythonIO_Flush(void);
 static int PythonIO_Init(void);
 static void PythonIO_Fini(void);
-static PyMODINIT_FUNC Py3Init_vim(void);
+PyMODINIT_FUNC Py3Init_vim(void);
 
 /* Utility functions for the vim/python interface
  * ----------------------------------------------
@@ -2222,7 +2220,8 @@
 
 static struct PyModuleDef vimmodule;
 
-static PyMODINIT_FUNC Py3Init_vim(void)
+#ifndef PROTO
+PyMODINIT_FUNC Py3Init_vim(void)
 {
     PyObject *mod;
     /* The special value is removed from sys.path in Python3_Init(). */
@@ -2255,6 +2254,7 @@
 
     return mod;
 }
+#endif
 
 /*************************************************************************
  * 4. Utility functions for handling the interface between Vim and Python.
diff --git a/src/undo.c b/src/undo.c
index 0423094..7abd67b 100644
--- a/src/undo.c
+++ b/src/undo.c
@@ -106,7 +106,7 @@
 static char_u *read_string_decrypt __ARGS((buf_T *buf UNUSED, FILE *fd, int len));
 static int serialize_header __ARGS((FILE *fp, buf_T *buf, char_u *hash));
 static int serialize_uhp __ARGS((FILE *fp, buf_T *buf, u_header_T *uhp));
-static u_header_T *unserialize_uhp __ARGS((FILE *fp, char_u *file_name, int new_version));
+static u_header_T *unserialize_uhp __ARGS((FILE *fp, char_u *file_name));
 static int serialize_uep __ARGS((FILE *fp, buf_T *buf, u_entry_T *uep));
 static u_entry_T *unserialize_uep __ARGS((FILE *fp, int *error, char_u *file_name));
 static void serialize_pos __ARGS((pos_T pos, FILE *fp));
@@ -694,9 +694,7 @@
 # define UF_HEADER_END_MAGIC	0xe7aa	/* magic after last header */
 # define UF_ENTRY_MAGIC		0xf518	/* magic at start of entry */
 # define UF_ENTRY_END_MAGIC	0x3581	/* magic after last entry */
-# define UF_VERSION_PREV	1	/* 2-byte undofile version number */
 # define UF_VERSION		2	/* 2-byte undofile version number */
-# define UF_VERSION_CRYPT_PREV	0x8001	/* idem, encrypted */
 # define UF_VERSION_CRYPT	0x8002	/* idem, encrypted */
 
 /* extra fields for header */
@@ -1019,10 +1017,9 @@
 }
 
     static u_header_T *
-unserialize_uhp(fp, file_name, new_version)
+unserialize_uhp(fp, file_name)
     FILE	*fp;
     char_u	*file_name;
-    int		new_version;
 {
     u_header_T	*uhp;
     int		i;
@@ -1068,26 +1065,25 @@
     uhp->uh_time = get8ctime(fp);
 
     /* Optional fields. */
-    if (new_version)
-	for (;;)
-	{
-	    int len = getc(fp);
-	    int what;
+    for (;;)
+    {
+	int len = getc(fp);
+	int what;
 
-	    if (len == 0)
+	if (len == 0)
+	    break;
+	what = getc(fp);
+	switch (what)
+	{
+	    case UHP_SAVE_NR:
+		uhp->uh_save_nr = get4c(fp);
 		break;
-	    what = getc(fp);
-	    switch (what)
-	    {
-		case UHP_SAVE_NR:
-		    uhp->uh_save_nr = get4c(fp);
-		    break;
-		default:
-		    /* field not supported, skip */
-		    while (--len >= 0)
-			(void)getc(fp);
-	    }
+	    default:
+		/* field not supported, skip */
+		while (--len >= 0)
+		    (void)getc(fp);
 	}
+    }
 
     /* Unserialize the uep list. */
     last_uep = NULL;
@@ -1564,7 +1560,6 @@
     char_u	*file_name;
     FILE	*fp;
     long	version, str_len;
-    int		new_version;
     char_u	*line_ptr = NULL;
     linenr_T	line_lnum;
     colnr_T	line_colnr;
@@ -1645,7 +1640,7 @@
 	goto error;
     }
     version = get2c(fp);
-    if (version == UF_VERSION_CRYPT || version == UF_VERSION_CRYPT_PREV)
+    if (version == UF_VERSION_CRYPT)
     {
 #ifdef FEAT_CRYPT
 	if (*curbuf->b_p_key == NUL)
@@ -1665,12 +1660,11 @@
 	goto error;
 #endif
     }
-    else if (version != UF_VERSION && version != UF_VERSION_PREV)
+    else if (version != UF_VERSION)
     {
 	EMSG2(_("E824: Incompatible undo file: %s"), file_name);
 	goto error;
     }
-    new_version = (version == UF_VERSION || version == UF_VERSION_CRYPT);
 
     if (fread(read_hash, UNDO_HASH_SIZE, 1, fp) != 1)
     {
@@ -1716,27 +1710,26 @@
     seq_cur = get4c(fp);
     seq_time = get8ctime(fp);
 
-    /* Optional header fields, not in previous version. */
-    if (new_version)
-	for (;;)
-	{
-	    int len = getc(fp);
-	    int what;
+    /* Optional header fields. */
+    for (;;)
+    {
+	int len = getc(fp);
+	int what;
 
-	    if (len == 0 || len == EOF)
+	if (len == 0 || len == EOF)
+	    break;
+	what = getc(fp);
+	switch (what)
+	{
+	    case UF_LAST_SAVE_NR:
+		last_save_nr = get4c(fp);
 		break;
-	    what = getc(fp);
-	    switch (what)
-	    {
-		case UF_LAST_SAVE_NR:
-		    last_save_nr = get4c(fp);
-		    break;
-		default:
-		    /* field not supported, skip */
-		    while (--len >= 0)
-			(void)getc(fp);
-	    }
+	    default:
+		/* field not supported, skip */
+		while (--len >= 0)
+		    (void)getc(fp);
 	}
+    }
 
     /* uhp_table will store the freshly created undo headers we allocate
      * until we insert them into curbuf. The table remains sorted by the
@@ -1758,7 +1751,7 @@
 	    goto error;
 	}
 
-	uhp = unserialize_uhp(fp, file_name, new_version);
+	uhp = unserialize_uhp(fp, file_name);
 	if (uhp == NULL)
 	    goto error;
 	uhp_table[num_read_uhps++] = uhp;
diff --git a/src/version.h b/src/version.h
index df420ab..7dd4589 100644
--- a/src/version.h
+++ b/src/version.h
@@ -36,5 +36,5 @@
 #define VIM_VERSION_NODOT	"vim73a"
 #define VIM_VERSION_SHORT	"7.3a"
 #define VIM_VERSION_MEDIUM	"7.3a BETA"
-#define VIM_VERSION_LONG	"VIM - Vi IMproved 7.3 BETA (2010 Jul 7)"
-#define VIM_VERSION_LONG_DATE	"VIM - Vi IMproved 7.3 BETA (2010 Jul 7, compiled "
+#define VIM_VERSION_LONG	"VIM - Vi IMproved 7.3a BETA (2010 Jul 18)"
+#define VIM_VERSION_LONG_DATE	"VIM - Vi IMproved 7.3a BETA (2010 Jul 18, compiled "