diff --git a/Utilities/cmlibarchive/libarchive/archive.h b/Utilities/cmlibarchive/libarchive/archive.h
index 1a1d32a6d..83d2c1669 100644
--- a/Utilities/cmlibarchive/libarchive/archive.h
+++ b/Utilities/cmlibarchive/libarchive/archive.h
@@ -54,7 +54,7 @@
 
 /* Get appropriate definitions of standard POSIX-style types. */
 /* These should match the types used in 'struct stat' */
-#if defined(_WIN32) && !defined(__CYGWIN__)
+#if defined(_WIN32) && !defined(__CYGWIN__) && !defined(__WATCOMC__)
 # define	__LA_INT64_T	__int64
 # if defined(_SSIZE_T_DEFINED) || defined(_SSIZE_T_)
 #  define	__LA_SSIZE_T	ssize_t
diff --git a/Utilities/cmlibarchive/libarchive/archive_entry.h b/Utilities/cmlibarchive/libarchive/archive_entry.h
index 85ea885f7..ae6a76e35 100644
--- a/Utilities/cmlibarchive/libarchive/archive_entry.h
+++ b/Utilities/cmlibarchive/libarchive/archive_entry.h
@@ -48,7 +48,7 @@
 #endif
 
 /* Get a suitable 64-bit integer type. */
-#if defined(_WIN32) && !defined(__CYGWIN__)
+#if defined(_WIN32) && !defined(__CYGWIN__) && !defined(__WATCOMC__)
 # define	__LA_INT64_T	__int64
 #else
 #include <unistd.h>
@@ -63,7 +63,7 @@
 #if ARCHIVE_VERSION_NUMBER >= 3999000
 /* Switch to plain 'int' for libarchive 4.0.  It's less broken than 'mode_t' */
 # define	__LA_MODE_T	int
-#elif defined(_WIN32) && !defined(__CYGWIN__) && !defined(__BORLANDC__)
+#elif defined(_WIN32) && !defined(__CYGWIN__) && !defined(__BORLANDC__) && !defined(__WATCOMC__)
 # define	__LA_MODE_T	unsigned short
 #else
 # define	__LA_MODE_T	mode_t
diff --git a/Utilities/cmlibarchive/libarchive/archive_windows.h b/Utilities/cmlibarchive/libarchive/archive_windows.h
index 620810c1c..1dd61b64e 100644
--- a/Utilities/cmlibarchive/libarchive/archive_windows.h
+++ b/Utilities/cmlibarchive/libarchive/archive_windows.h
@@ -188,6 +188,9 @@
 #define	S_ISDIR(m)	(((m) & S_IFMT) == S_IFDIR)	/* directory */
 #define	S_ISREG(m)	(((m) & S_IFMT) == S_IFREG)	/* regular file */
 #endif
+
+#if !defined(__WATCOMC__) 
+
 #define	S_ISLNK(m)  (((m) & S_IFMT) == S_IFLNK) /* Symbolic link */
 #define	S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK) /* Socket */
 
@@ -227,6 +230,8 @@
 #define	S_IWOTH        _S_IWOTH
 #define	S_IROTH        _S_IROTH
 
+#endif
+
 #define	F_DUPFD	  	0	/* Duplicate file descriptor.  */
 #define	F_GETFD		1	/* Get file descriptor flags.  */
 #define	F_SETFD		2	/* Set file descriptor flags.  */