Fix Qt5 macos build.

leocad.pro

@@ -164,6 +164,19 @@ macx {
 	DEFINES += LC_DISABLE_UPDATE_CHECK=1
 }
 
+# AGL is not included since 26.0 and Qt5 isn't going to be fixed.
+macx {
+	# QMAKE_MAC_SDK examples: "macosx26.0", "macosx26", "macosx27.1"
+	SDK_TAG        = $$QMAKE_MAC_SDK
+	SDK_VER_STR    = $$replace(SDK_TAG, "macosx", "")
+	SDK_VER_MAJOR  = $$section(SDK_VER_STR, ., 0, 0)
+
+	greaterThan(SDK_VER_MAJOR, 25) {
+		QMAKE_LIBS_OPENGL -= -framework AGL
+		LIBS -= -framework AGL
+	}
+}
+
 ios {
 	DEFINES += LC_DISABLE_RENDER_DIALOG=1
 	DEFINES += LC_DISABLE_BLENDER=1