diff '--color=auto' -r -U2 asymptote-3.14.orig/tests/Makefile asymptote-3.14/tests/Makefile
--- asymptote-3.14.orig/tests/Makefile	2026-08-29 07:36:05.000000000 +0700
+++ asymptote-3.14/tests/Makefile	2026-09-03 12:40:36.276833286 +0700
@@ -2,4 +2,5 @@
 
 TESTDIRS = $(wildcard */)
+PYTHON ?= python3
 
 test: $(TESTDIRS) test_collections_errors
@@ -11,5 +12,5 @@
 test_collections_errors:
 	@echo
-	python3 test_collections_errors.py
+	$(PYTHON) test_collections_errors.py
 
 $(EXTRADIRS)::