--- ./build/moz.configure/init.configure.orig	2019-05-07 22:00:08.566365184 +0100
+++ ./build/moz.configure/init.configure	2019-05-07 22:03:54.337564868 +0100
@@ -723,7 +723,7 @@
 
     # The CPU granularity is probably not enough. Moving more things from
     # old-configure will tell us if we need more
-    if cpu.endswith("86") or (cpu.startswith("i") and "86" in cpu):
+    if cpu.endswith('586') or (cpu.startswith('i') and '586' in cpu):
         canonical_cpu = "x86"
         endianness = "little"
     elif cpu in ("x86_64", "ia64"):