From abb3354afa77267de11cca0672a0ee09a66237ad Mon Sep 17 00:00:00 2001
From: Pavel Sanda <sanda@lyx.org>
Date: Tue, 16 Jul 2024 09:34:26 +0200
Subject: [PATCH] backport 2882bed1a

---
 configure.ac | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/configure.ac b/configure.ac
index 75f23f32c1..0384cd8c52 100644
--- a/configure.ac
+++ b/configure.ac
@@ -148,6 +148,9 @@ if test "$ac_cv_type_long_long_int" = yes; then
   AC_CHECK_SIZEOF(long long)
 fi
 
+# egrep is used in lib/Makefile.am
+AC_PROG_EGREP
+
 ### We need iconv for unicode support (Qt4 frontend requires it too)
 LYX_USE_INCLUDED_ICONV