diff --git a/JavaScriptCore/API/JSBase.h b/JavaScriptCore/API/JSBase.h
index 2e16720..c948035 100644
--- a/JavaScriptCore/API/JSBase.h
+++ b/JavaScriptCore/API/JSBase.h
@@ -69,6 +69,8 @@ typedef struct OpaqueJSValue* JSObjectRef;
     #define JS_EXPORT
 #elif defined(__GNUC__) && !defined(__CC_ARM) && !defined(__ARMCC__)
     #define JS_EXPORT __attribute__((visibility("default")))
+#elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)
+    #define JS_EXPORT __global
 #elif defined(WIN32) || defined(_WIN32) || defined(_WIN32_WCE)
     #if defined(BUILDING_JavaScriptCore) || defined(BUILDING_WTF)
         #define JS_EXPORT __declspec(dllexport)
diff --git a/WebCore/WebCorePrefix.h b/WebCore/WebCorePrefix.h
index 1ffb675..9a477cb 100644
--- a/WebCore/WebCorePrefix.h
+++ b/WebCore/WebCorePrefix.h
@@ -66,6 +66,9 @@
 #ifdef __cplusplus
 // Must come before include of algorithm.
 #define PREFIX_FOR_WEBCORE 1
+#if defined(__SUNPRO_C) || defined(__SUNPRO_CC)
+#define EXPORT __global
+#else
 #define EXPORT __attribute__((visibility("default")))
 #endif
 // Android uses a single set of include directories when building WebKit and
diff --git a/WebKit/gtk/webkit/webkitdefines.h b/WebKit/gtk/webkit/webkitdefines.h
index a5884f3..ae07a5e 100644
--- a/WebKit/gtk/webkit/webkitdefines.h
+++ b/WebKit/gtk/webkit/webkitdefines.h
@@ -31,9 +31,13 @@
     #endif
     #define WEBKIT_OBSOLETE_API WEBKIT_API
 #else
+#if defined(__SUNPRO_C) || defined(__SUNPRO_CC)
+    #define WEBKIT_API __global
+#else
     #define WEBKIT_API __attribute__((visibility("default")))
     #define WEBKIT_OBSOLETE_API WEBKIT_API __attribute__((deprecated))
 #endif
+#endif
 
 #ifndef WEBKIT_API
     #define WEBKIT_API