diff --git a/Utilities/cmlibarchive/libarchive/archive_endian.h b/Utilities/cmlibarchive/libarchive/archive_endian.h
index c3c78b33e..bbf58fd10 100644
--- a/Utilities/cmlibarchive/libarchive/archive_endian.h
+++ b/Utilities/cmlibarchive/libarchive/archive_endian.h
@@ -45,11 +45,14 @@
  * - SGI MIPSpro
  * - Microsoft Visual C++ 6.0 (supposedly newer versions too)
  * - IBM VisualAge 6 (XL v6)
+ * - Sun WorkShop C (SunPro) before 5.9
  */
 #if defined(__WATCOMC__) || defined(__sgi) || defined(__hpux) || defined(__BORLANDC__)
 #define	inline
 #elif defined(__IBMC__) && __IBMC__ < 700
 #define	inline
+#elif defined(__SUNPRO_C) && __SUNPRO_C < 0x590
+#define inline
 #elif defined(_MSC_VER) || defined(__osf__)
 #define inline __inline
 #endif