diff -Naurp catalyst-3.0.4.orig/catalyst/targets/stage3.py catalyst-3.0.4/catalyst/targets/stage3.py
--- catalyst-3.0.4.orig/catalyst/targets/stage3.py	2019-02-04 21:58:51.000000000 -0500
+++ catalyst-3.0.4/catalyst/targets/stage3.py	2019-03-04 00:43:51.095966049 -0500
@@ -13,9 +13,25 @@ class stage3(StageBase):
 	"""
 	def __init__(self,spec,addlargs):
 		self.required_values=[]
-		self.valid_values=[]
+		self.valid_values=["chost"]
 		StageBase.__init__(self,spec,addlargs)
 
+	def override_chost(self):
+		if "chost" in self.settings:
+			self.settings["CHOST"] = self.settings["chost"]
+
+	def override_cflags(self):
+		if "cflags" in self.settings:
+			self.settings["CFLAGS"] = self.settings["cflags"]
+
+	def override_cxxflags(self):
+		if "cxxflags" in self.settings:
+			self.settings["CXXFLAGS"] = self.settings["cxxflags"]
+
+	def override_ldflags(self):
+		if "ldflags" in self.settings:
+			self.settings["LDFLAGS"] = self.settings["ldflags"]
+
 	def set_portage_overlay(self):
 		StageBase.set_portage_overlay(self)
 		if "portage_overlay" in self.settings: