diff --git a/v23/mklinechecker.go b/v23/mklinechecker.go
index bd814417..364a273a 100644
--- a/v23/mklinechecker.go
+++ b/v23/mklinechecker.go
@@ -306,11 +306,30 @@ func (ck MkLineChecker) checkInclude() {
 
 	case includedFile.HasSuffixPath("intltool/buildlink3.mk"):
 		mkline.Warnf("Please write \"USE_TOOLS+= intltool\" instead of this line.")
+
+	case includedFile.HasSuffixPath("lang/python/egg.mk"):
+		ck.checkIncludePythonWheel()
 	}
 
 	ck.checkIncludeBuiltin()
 }
 
+func (ck MkLineChecker) checkIncludePythonWheel() {
+	if pkg := ck.MkLines.pkg; pkg != nil {
+		accepted := pkg.vars.LastValue("PYTHON_VERSIONS_ACCEPTED")
+		incompat := pkg.vars.LastValue("PYTHON_VERSIONS_INCOMPATIBLE")
+		switch {
+		case contains(accepted, "3") && !contains(accepted, "2"),
+			contains(incompat, "27"):
+			mkline := ck.MkLine
+			mkline.Warnf("Python egg.mk is deprecated, use wheel.mk instead.")
+			mkline.Explain(
+				"https://packaging.python.org/en/latest/discussions/wheel-vs-egg/",
+				"describes the difference between the formats.")
+		}
+	}
+}
+
 func (ck MkLineChecker) checkIncludeBuiltin() {
 	mkline := ck.MkLine
 
diff --git a/v23/mklinechecker_test.go b/v23/mklinechecker_test.go
index 6a1bbad9..84561345 100644
--- a/v23/mklinechecker_test.go
+++ b/v23/mklinechecker_test.go
@@ -508,6 +508,86 @@ func (s *Suite) Test_MkLineChecker_checkInclude__hacks(c *check.C) {
 			"Relative path \"../../category/package/nonexistent.mk\" does not exist.")
 }
 
+func (s *Suite) Test_MkLineChecker_checkIncludePythonWheel__no_restrictions(c *check.C) {
+	t := s.Init(c)
+
+	t.CreateFileLines("lang/python/egg.mk",
+		MkCvsID)
+	t.SetUpPackage("devel/py-test")
+	t.FinishSetUp()
+	t.Chdir("devel/py-test")
+
+	G.Check(".")
+
+	t.CheckOutputEmpty()
+}
+
+func (s *Suite) Test_MkLineChecker_checkIncludePythonWheel__not_Python_2(c *check.C) {
+	t := s.Init(c)
+
+	t.CreateFileLines("lang/python/egg.mk",
+		MkCvsID)
+	t.SetUpPackage("devel/py-test",
+		"PYTHON_VERSIONS_INCOMPATIBLE=\t27",
+		".include \"../../lang/python/egg.mk\"")
+	t.FinishSetUp()
+	t.Chdir("devel/py-test")
+
+	G.Check(".")
+
+	t.CheckOutputLines(
+		"WARN: Makefile:21: Python egg.mk is deprecated, use wheel.mk instead.")
+}
+
+func (s *Suite) Test_MkLineChecker_checkIncludePythonWheel__not_Python_3(c *check.C) {
+	t := s.Init(c)
+
+	t.CreateFileLines("lang/python/egg.mk",
+		MkCvsID)
+	t.SetUpPackage("devel/py-test",
+		"PYTHON_VERSIONS_INCOMPATIBLE=\t38\t# rationale",
+		".include \"../../lang/python/egg.mk\"")
+	t.FinishSetUp()
+	t.Chdir("devel/py-test")
+
+	G.Check(".")
+
+	t.CheckOutputEmpty()
+}
+
+func (s *Suite) Test_MkLineChecker_checkIncludePythonWheel__only_Python_2(c *check.C) {
+	t := s.Init(c)
+
+	t.CreateFileLines("lang/python/egg.mk",
+		MkCvsID)
+	t.SetUpPackage("devel/py-test",
+		"PYTHON_VERSIONS_ACCEPTED=\t27\t# rationale",
+		".include \"../../lang/python/egg.mk\"")
+	t.FinishSetUp()
+	t.Chdir("devel/py-test")
+
+	G.Check(".")
+
+	t.CheckOutputEmpty()
+}
+
+func (s *Suite) Test_MkLineChecker_checkIncludePythonWheel__only_Python_3(c *check.C) {
+	t := s.Init(c)
+
+	t.CreateFileLines("lang/python/egg.mk",
+		MkCvsID)
+	t.SetUpPackage("devel/py-test",
+		"PYTHON_VERSIONS_ACCEPTED=\t310 38\t# rationale",
+		".include \"../../lang/python/egg.mk\"")
+	t.FinishSetUp()
+	t.Chdir("devel/py-test")
+
+	G.Check(".")
+
+	t.CheckOutputLines(
+		"WARN: Makefile:21: Python egg.mk is deprecated, use wheel.mk instead.")
+}
+
 // A buildlink3.mk file may include its corresponding builtin.mk file directly.
 func (s *Suite) Test_MkLineChecker_checkIncludeBuiltin__buildlink3_mk(c *check.C) {
 	t := s.Init(c)