diff --git a/avilib/avidump.c b/avilib/avidump.c
index 6cfaab3bd..202b52a7a 100644
--- a/avilib/avidump.c
+++ b/avilib/avidump.c
@@ -29,14 +29,23 @@
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
+
+//SLM
+#ifdef WIN32
+#include <io.h>
+#define STDOUT_FILENO fileno(stdout)
+#else
 #include <unistd.h>
+#endif
+
 #include <ctype.h>
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 
-#if defined(__bsdi__) || defined(__FreeBSD__)
+//SLM
+#if defined(__bsdi__) || defined(__FreeBSD__) || defined WIN32
 typedef off_t off64_t;
 #define lseek64 lseek
 #endif
diff --git a/avilib/avilib.c b/avilib/avilib.c
index fbe85e25f..528e3ea24 100644
--- a/avilib/avilib.c
+++ b/avilib/avilib.c
@@ -25,6 +25,12 @@
  *
  */
 
+//SLM
+#ifdef WIN32
+#include <io.h>
+#define strncasecmp(a,b,c) _strnicmp(a,b,c)
+#endif
+
 #include "avilib.h"
 //#include <time.h>
 
@@ -39,6 +45,12 @@ static char id_str[MAX_INFO_STRLEN];
 
 #define FRAME_RATE_SCALE 1000000
 
+//SLM
+/* ssize_t not defined in vc6 */
+#if !defined(ssize_t)
+typedef int ssize_t;
+#endif
+
 /*******************************************************************
  *                                                                 *
  *    Utilities for writing an AVI File                            *
@@ -191,6 +203,22 @@ static int avi_add_index_entry(avi_t *AVI, unsigned char *tag, long flags, unsig
    return 0;
 }
 
+//SLM
+#ifndef S_IRUSR
+#define S_IRWXU       00700       /* read, write, execute: owner */
+#define S_IRUSR       00400       /* read permission: owner */
+#define S_IWUSR       00200       /* write permission: owner */
+#define S_IXUSR       00100       /* execute permission: owner */
+#define S_IRWXG       00070       /* read, write, execute: group */
+#define S_IRGRP       00040       /* read permission: group */
+#define S_IWGRP       00020       /* write permission: group */
+#define S_IXGRP       00010       /* execute permission: group */
+#define S_IRWXO       00007       /* read, write, execute: other */
+#define S_IROTH       00004       /* read permission: other */
+#define S_IWOTH       00002       /* write permission: other */
+#define S_IXOTH       00001       /* execute permission: other */
+#endif
+
 /*
    AVI_open_output_file: Open an AVI File and write a bunch
                          of zero bytes as space for the header.
diff --git a/avilib/avilib.h b/avilib/avilib.h
index 836c0110f..e48d996ff 100644
--- a/avilib/avilib.h
+++ b/avilib/avilib.h
@@ -29,8 +29,18 @@
 #include <sys/stat.h>
 #include <stdio.h>
 #include <fcntl.h>
+
+//SLM
+#ifdef WIN32
+#define uint16_t unsigned __int16
+#define uint32_t unsigned __int32
+#define uint64_t unsigned __int64
+#else
 #include <unistd.h>
 #include <inttypes.h>
+#endif
+
+
 #include <limits.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/avilib/avimisc.c b/avilib/avimisc.c
index 2dfeb4bfd..512419211 100644
--- a/avilib/avimisc.c
+++ b/avilib/avimisc.c
@@ -23,7 +23,13 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+
+//SLM
+#ifdef WIN32
+#else
 #include <unistd.h>
+#endif
+
 #include <sys/stat.h>
 #include <string.h>