$NetBSD: patch-installperl,v 1.2 2021/03/15 14:23:12 ryoon Exp $

Haiku part: From:
https://github.com/haikuports/haikuports/blob/master/dev-lang/perl/patches/perl-5.32.0.patchset

--- installperl.orig	2020-12-18 09:58:48.000000000 +0000
+++ installperl
@@ -336,7 +336,6 @@ $do_installprivlib = 0 if $versiononly &
 mkpath($installprivlib);
 mkpath($installarchlib);
 mkpath($installsitelib, $opts{verbose}, 0777) if ($installsitelib);
-mkpath($installsitearch, $opts{verbose}, 0777) if ($installsitearch);
 
 if (-d 'lib') {
     find({no_chdir => 1, wanted => \&installlib}, 'lib')
@@ -382,6 +381,13 @@ elsif ($Is_Cygwin) { # On Cygwin symlink
 
     # AIX needs perl.exp installed as well.
     push(@corefiles,'perl.exp') if $^O eq 'aix';
+
+    # Haiku requires haikuish.h.
+    if ($^O eq 'haiku') {
+        # Haiku needs haikuish.h installed as well.
+        mkpath("$installarchlib/CORE/haiku", $opts{verbose}, 0777);
+        push(@corefiles,'haiku/haikuish.h');
+    }
 }