(Open)Solaris doesn't have strnstr either:
https://bugs.webkit.org/show_bug.cgi?id=30647
http://trac.webkit.org/changeset/50533


--- src/3rdparty/webkit/JavaScriptCore/wtf/StringExtras.h
+++ src/3rdparty/webkit/JavaScriptCore/wtf/StringExtras.h
@@ -85,7 +85,7 @@
 
 #endif
 
-#if PLATFORM(WIN_OS) || PLATFORM(LINUX)
+#if PLATFORM(WIN_OS) || PLATFORM(LINUX) || PLATFORM(SOLARIS)
 
 inline char* strnstr(const char* buffer, const char* target, size_t bufferLength)
 {
--- src/3rdparty/javascriptcore/JavaScriptCore/wtf/StringExtras.h
+++ src/3rdparty/javascriptcore/JavaScriptCore/wtf/StringExtras.h
@@ -85,7 +85,7 @@
 
 #endif
 
-#if PLATFORM(WIN_OS) || PLATFORM(LINUX)
+#if PLATFORM(WIN_OS) || PLATFORM(LINUX) || PLATFORM(SOLARIS)
 
 inline char* strnstr(const char* buffer, const char* target, size_t bufferLength)
 {