https://gitlab.freedesktop.org/libfprint/libfprint/-/merge_requests/366

From 2584d440afc87d463cb8dc809d48c660e091c2c4 Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Thu, 23 Jun 2022 05:57:46 +0100
Subject: [PATCH] nbis: fix build on musl

Drop re-definition of stderr. There's no need for this anywhere
(including glibc). This breaks in particular on musl because
stderr (and stdin) are both const, and macros unlike in glibc.

Bug: https://bugs.gentoo.org/853811
--- a/libfprint/nbis/include/bozorth.h
+++ b/libfprint/nbis/include/bozorth.h
@@ -217,8 +217,6 @@ struct xytq_struct {
 /**************************************************************************/
 /* Globals supporting command line options */
 extern int verbose_threshold;
-/* Global supporting error reporting */
-extern FILE *stderr;
 
 /**************************************************************************/
 /* In: BZ_GBLS.C */
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