From: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Date: Fri, 18 Mar 2022 16:36:16 +0100
Subject: Fix filenames for glibc SO files on alpha and ia64

Fixes [Bug #18645]
---
 test/fiddle/helper.rb | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/test/fiddle/helper.rb b/test/fiddle/helper.rb
index 0ea3bf5..e470f5a 100644
--- a/test/fiddle/helper.rb
+++ b/test/fiddle/helper.rb
@@ -49,8 +49,14 @@ when /linux/
     libm_so = libc_so
   else
     # glibc
-    libc_so = "libc.so.6"
-    libm_so = "libm.so.6"
+    case RUBY_PLATFORM
+    when /alpha-linux/, /ia64-linux/
+      libc_so = "libc.so.6.1"
+      libm_so = "libm.so.6.1"
+    else
+      libc_so = "libc.so.6"
+      libm_so = "libm.so.6"
+    end
   end
 when /mingw/, /mswin/
   require "rbconfig"