File slic3r-allow-older-threads.patch of Package slic3r

diff --git a/Build.PL b/Build.PL
index 0c6b011..df2a28e 100644
--- a/Build.PL
+++ b/Build.PL
@@ -22,7 +22,7 @@ my %prereqs = qw(
     Test::More                      0
     Thread::Semaphore               0
     IO::Scalar                      0
-    threads                         1.96
+    threads                         1.87
     Time::HiRes                     0
     Unicode::Normalize              0
 );
diff --git a/lib/Slic3r.pm b/lib/Slic3r.pm
index bcd337d..5a43bf6 100644
--- a/lib/Slic3r.pm
+++ b/lib/Slic3r.pm
@@ -19,7 +19,7 @@ our $have_threads;
 BEGIN {
     use Config;
     $have_threads = $Config{useithreads} && eval "use threads; use threads::shared; use Thread::Queue; 1";
-    warn "threads.pm >= 1.96 is required, please update\n" if $have_threads && $threads::VERSION < 1.96;
+    warn "threads.pm >= 1.87 is required, please update\n" if $have_threads && $threads::VERSION < 1.87;
     
     ### temporarily disable threads if using the broken Moo version
     use Moo;