From fc398e1a741f0074b6043f8f525b695dd0f071ee Mon Sep 17 00:00:00 2001
From: Marius Bakke <marius@gnu.org>
Date: Fri, 9 Sep 2022 02:12:20 +0200
Subject: gnu: QPDF: Fix build with grep 3.8.

This fixes a regression from commit c527b0ce23c5d9228d29c5f90892aa5f05e77347.

* gnu/packages/pdf.scm (qpdf)[source](modules, snippet): New fields.
---
 gnu/packages/pdf.scm | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/pdf.scm b/gnu/packages/pdf.scm
index cf4d9c872f..09ecd252bc 100644
--- a/gnu/packages/pdf.scm
+++ b/gnu/packages/pdf.scm
@@ -833,7 +833,18 @@ (define-public qpdf
                                   "/qpdf-" version ".tar.gz"))
               (sha256
                (base32
-                "049q94rzlcbdr09rvl8xfj3924mk7rfm35x8cg4nisl4lnr27z78"))))
+                "049q94rzlcbdr09rvl8xfj3924mk7rfm35x8cg4nisl4lnr27z78"))
+              (modules '((guix build utils)))
+              (snippet
+               #~(begin
+                   ;; grep 3.8 emits a warning about 'egrep' being deprecated
+                   ;; which breaks some tests.  Adjust accordingly.
+                   ;; Try removing this for QPDF >= 11.
+                   (substitute* '("build-scripts/build-doc"
+                                  "qpdf/qtest/qpdf/diff-encrypted"
+                                  "qpdf/qtest/qpdf/diff-ignore-ID-version")
+                     (("egrep")
+                      "grep -E"))))))
     (build-system gnu-build-system)
     (arguments
      (list
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