--- a/gpr/src/gpr-compilation-process.adb	2025-12-02 20:16:02.856971670 +0100
+++ b/gpr/src/gpr-compilation-process.adb	2025-12-02 20:16:18.920776145 +0100
@@ -41,7 +41,7 @@
    --  A set of key=value
 
    package Prj_Maps is new Containers.Indefinite_Ordered_Maps
-     (String, Env_Maps.Map, Env_Maps."<", Env_Maps."=");
+     (String, Env_Maps.Map, "<", Env_Maps."=");
    --  A set of project+language=map
 
    function "<" (Left, Right : Id) return Boolean is