diff -ur a/tests/Makefile b/tests/Makefile
--- a/tests/Makefile	2024-11-25 18:28:34.957193217 +0000
+++ b/tests/Makefile	2024-11-25 18:30:17.261515826 +0000
@@ -53,20 +53,11 @@
 
 # special case, test 64- and 32-bit both
 # (maximal testings under main development platform)
-ifeq ($(UNAME)-$(MACHINE),Linux-x86_64)
-HAS_64CDEFS  ?= $(call exists,-m64,sys/cdefs.h,exit)
-ifeq ($(HAS_64CDEFS),1)
-DEV_MACHINE  ?= 1
+ifndef HAS_32CDEFS
+$(error HAS_32CDEFS is not set)
 endif
-# sudo apt-get install gcc-multilib
-HAS_32CDEFS  ?= $(call exists,-m32,sys/cdefs.h,exit)
-ifeq ($(HAS_32CDEFS),1)
-DEV_MACHINE  ?= 1
-endif
-else
-DEV_MACHINE  ?= 0
-HAS_64CDEFS  ?= 0
-HAS_32CDEFS  ?= 0
+ifndef HAS_64CDEFS
+$(error HAS_64CDEFS is not set)
 endif
 
 # -------------