--- a/gnat2why/gnat2why_c.gpr	2017-10-04 21:41:41.613376056 +0200
+++ b/gnat2why/gnat2why_c.gpr	2017-10-04 21:42:30.582572536 +0200
@@ -1,4 +1,7 @@
 project Gnat2Why_C is
    for Languages use ("C");
    for Object_Dir use "obj";
+   package Compiler is
+      for Driver ("C") use External ("CC", "gcc");
+   end Compiler;
 end Gnat2Why_C;
--- a/src/why/xgen/Makefile	2025-02-09 13:48:38.217846207 +0100
+++ b/src/why/xgen/Makefile	2025-02-09 13:49:36.594134360 +0100
@@ -31,7 +31,7 @@
  why-atree-to_json.adb
 
 all:
-	gprbuild -j0 -p -Phelpers xtree
+	gprbuild -v -p -Phelpers xtree -XLIBRARY_TYPE=relocatable
 	./xtree
 	cp $(GENERATED_FILES) ../