Comment # 5 on bug 1133245 from Martin Li��ka

I guess the difference is caused by a divergence in configure script:

$ diff -u nolto.txt lto.txt
--- nolto.txt    2019-04-25 09:19:28.461659689 +0200
+++ lto.txt    2019-04-25 09:20:41.047043653 +0200
@@ -1,5 +1,5 @@
  checking for mmap of /dev/zero... yes
- checking whether a fault handler according to POSIX works... yes
+ checking whether a fault handler according to POSIX works... no
  checking whether a fault handler according to Linux/i386 works... no
  checking whether a fault handler according to old Linux/i386 works... no
  checking whether a fault handler according to Linux/m68k works... no
@@ -14,11 +14,8 @@
  checking whether a fault handler according to MacOSX/Darwin7 PowerPC works...
no
  checking whether a fault handler according to MacOSX/Darwin5 PowerPC works...
no
  checking whether a fault handler according to Hurd works... no
- checking ucontext.h usability... yes
- checking ucontext.h presence... yes
- checking for ucontext.h... yes
- checking for the fault handler specifics... fault-linux-i386.h
- checking if the system supports catching SIGSEGV... yes
+ checking for the fault handler specifics... fault-linux-x86_64-old.h
+ checking if the system supports catching SIGSEGV... no
  checking for stack direction... grows down
  checking for prmap_t in sys/procfs.h... no
  checking for mquery... no