From 26611f56fb1108de8205667fa9318b61794d0c9c Mon Sep 17 00:00:00 2001
From: "Jan (janneke) Nieuwenhuizen" <janneke@gnu.org>
Date: Mon, 29 Jun 2020 07:52:59 +0200
Subject: gnu: hurd-core-headers: Strictly include header packages.

* gnu/packages/hurd.scm (hurd-core-headers)[arguments]: Strictly include
header package inputs in union.
---
 gnu/packages/hurd.scm | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/gnu/packages/hurd.scm b/gnu/packages/hurd.scm
index f0c4451e80..98fe594b7f 100644
--- a/gnu/packages/hurd.scm
+++ b/gnu/packages/hurd.scm
@@ -264,13 +264,21 @@ Library for GNU/Hurd.")
     (arguments
      '(#:modules ((guix build union))
        #:builder (begin
-                   (use-modules (ice-9 match)
+                   (use-modules (srfi srfi-1)
+                                (srfi srfi-26)
+                                (ice-9 match)
                                 (guix build union))
-                   (match %build-inputs
-                     (((names . directories) ...)
-                      (union-build (assoc-ref %outputs "out")
-                                   directories)
-                      #t)))))
+                   (let ((inputs (filter
+                                  (compose (cute member <> '("gnumach-headers"
+                                                             "hurd-headers"
+                                                             "hurd-minimal"))
+                                           car)
+                                  %build-inputs)))
+                     (match inputs
+                       (((names . directories) ...)
+                        (union-build (assoc-ref %outputs "out")
+                                     directories)
+                        #t))))))
     (inputs `(("gnumach-headers" ,gnumach-headers)
               ("hurd-headers" ,hurd-headers)
               ("hurd-minimal" ,hurd-minimal)))
-- 
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