openblas: add perl as a build dependency (#21908)

var/spack/repos/builtin/packages/openblas/0001-use-usr-bin-env-perl.patch

@@ -0,0 +1,55 @@
+From ec6b354c32e939605331e2081590815a86413ca8 Mon Sep 17 00:00:00 2001
+From: Harmen Stoppels <harmenstoppels@gmail.com>
+Date: Wed, 24 Feb 2021 14:07:20 +0100
+Subject: [PATCH] use /usr/bin/env perl
+
+---
+ c_check           | 2 +-
+ exports/gensymbol | 2 +-
+ f_check           | 2 +-
+ interface/create  | 2 +-
+ 4 files changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/c_check b/c_check
+index 9c8b1aba..e24943a2 100644
+--- a/c_check
++++ b/c_check
+@@ -1,4 +1,4 @@
+-#!/usr/bin/perl
++#!/usr/bin/env perl
+ 
+ #use File::Basename;
+ # use File::Temp qw(tempfile);
+diff --git a/exports/gensymbol b/exports/gensymbol
+index 857a17a9..e7210a03 100644
+--- a/exports/gensymbol
++++ b/exports/gensymbol
+@@ -1,4 +1,4 @@
+-#!/usr/bin/perl
++#!/usr/bin/env perl
+ 
+ # Changelog
+ # 2017/09/03 staticfloat
+diff --git a/f_check b/f_check
+index ffe9c6b4..d044f254 100644
+--- a/f_check
++++ b/f_check
+@@ -1,4 +1,4 @@
+-#!/usr/bin/perl
++#!/usr/bin/env perl
+ 
+ $hostos   = `uname -s | sed -e s/\-.*//`;    chop($hostos);
+ 
+diff --git a/interface/create b/interface/create
+index b7be8ab6..0b9cefa2 100755
+--- a/interface/create
++++ b/interface/create
+@@ -1,4 +1,4 @@
+-#!/usr/bin/perl
++#!/usr/bin/env perl
+ 
+ $count = 0;
+ 
+-- 
+2.25.1
+

var/spack/repos/builtin/packages/openblas/package.py

@@ -116,6 +116,9 @@ class Openblas(MakefilePackage):
     patch('openblas_fujitsu_v0.3.11.patch', when='@0.3.11:0.3.12 %fj')
     patch('openblas_fujitsu2.patch', when='@0.3.10:0.3.12 %fj')
 
+    # Use /usr/bin/env perl in build scripts
+    patch('0001-use-usr-bin-env-perl.patch', when='@:0.3.13')
+
     # See https://github.com/spack/spack/issues/19932#issuecomment-733452619
     conflicts('%gcc@7.0.0:7.3.99,8.0.0:8.2.99', when='@0.3.11:')
 
@@ -131,6 +134,8 @@ class Openblas(MakefilePackage):
     conflicts('threads=openmp', when='%apple-clang', msg="Apple's clang does not support OpenMP")
     conflicts('threads=openmp @:0.2.19', when='%clang', msg='OpenBLAS @:0.2.19 does not support OpenMP with clang!')
 
+    depends_on('perl', type='build')
+
     @property
     def parallel(self):
         # unclear whether setting `-j N` externally was supported before 0.3