Add node.installPrefix

Author: ry

src/node.cc

@@ -352,6 +352,7 @@ static Local<Object> Load(int argc, char *argv[]) {
   global_obj->Set(String::NewSymbol("node"), node_obj);
 
   node_obj->Set(String::NewSymbol("version"), String::New(NODE_VERSION));
+  node_obj->Set(String::NewSymbol("installPrefix"), String::New(NODE_PREFIX));
 
   int i, j;
   Local<Array> arguments = Array::New(argc - dash_dash_index + 1);

src/node_version.h.in

@@ -7,5 +7,6 @@
 # define NODE_VERSION "@VERSION@ (debug)"
 #endif
 #define NODE_CFLAGS "@CCFLAGS@ @CPPFLAGS@ -I@PREFIX@/include/node"
+#define NODE_PREFIX "@PREFIX@"
 
 #endif /* node_version_h */