diff --git a/Rez/Rez.cc b/Rez/Rez.cc
index cae9d57e63..268d700ccd 100644
--- a/Rez/Rez.cc
+++ b/Rez/Rez.cc
@@ -28,6 +28,8 @@ int main(int argc, const char *argv[])
 		("output,o", po::value<std::string>()->default_value("rez.output.rsrc"), "output file")
 		("type,t", po::value<std::string>()->default_value("rsrc"), "output file finder type code")
 		("creator,c", po::value<std::string>()->default_value("RSED"), "output file finder creator code")
+		("define,D", po::value<std::vector<std::string>>(), "predefine preprocessor symbol")
+		("include,I", po::value<std::vector<std::string>>(), "add include file path")
 		("debug,d", "debug logging")
 	;
 	po::options_description hidden, alldesc;
@@ -71,6 +73,13 @@ int main(int argc, const char *argv[])
 	for(std::string fn : options["input"].as<std::vector<std::string>>())
 	{
 		RezLexer lexer(fn);
+
+		for(std::string define : options["define"].as<std::vector<std::string>>())
+			lexer.addDefine(define);
+		for(std::string path : options["include"].as<std::vector<std::string>>())
+			lexer.addIncludePath(path);
+
+
 		RezParser parser(lexer, world);
 		parser.parse();
 	}
diff --git a/Rez/RezLexer.cc b/Rez/RezLexer.cc
index 07f23a2861..70d344f07c 100644
--- a/Rez/RezLexer.cc
+++ b/Rez/RezLexer.cc
@@ -101,6 +101,18 @@ RezLexer::~RezLexer()
 
 }
 
+
+
+void RezLexer::addDefine(std::string str)
+{
+	pImpl->ctx.add_macro_definition(str);
+}
+
+void RezLexer::addIncludePath(std::string path)
+{
+	pImpl->ctx.add_include_path(path.c_str());
+}
+
 bool RezLexer::atEnd()
 {
 	return pImpl->iter == pImpl->ctx.end();
diff --git a/Rez/RezLexer.h b/Rez/RezLexer.h
index c0e7f12cea..a3c6b97a0c 100644
--- a/Rez/RezLexer.h
+++ b/Rez/RezLexer.h
@@ -23,6 +23,9 @@ public:
 	~RezLexer();
 
 	RezSymbol nextToken();
+
+	void addDefine(std::string str);
+	void addIncludePath(std::string path);
 };
 
 #endif // REZLEXER_H