[packages/libredwg] add upstream patch to fix build due to redefined name

[atler]

commit 4c60499d574c93ae37669e163af411d69eab985b
Author: Jan Palus <atler at pld-linux.org>
Date:   Thu Aug 13 19:43:16 2026 +0200

    add upstream patch to fix build due to redefined name

 config-update.patch | 43 +++++++++++++++++++++++++++++++++++++++++++
 libredwg.spec       |  2 ++
 2 files changed, 45 insertions(+)
---
diff --git a/libredwg.spec b/libredwg.spec
index 0b92fe4..1904599 100644
--- a/libredwg.spec
+++ b/libredwg.spec
@@ -13,6 +13,7 @@ Source0:	https://ftp.gnu.org/gnu/libredwg/%{name}-%{version}.tar.xz
 # Source0-md5:	f2929a35db8e74d304fd720ab96f5eee
 Patch0:		%{name}-info.patch
 Patch1:		%{name}-python.patch
+Patch2:		config-update.patch
 URL:		http://www.gnu.org/software/libredwg/
 BuildRequires:	autoconf >= 2.69
 BuildRequires:	automake >= 1:1.14
@@ -102,6 +103,7 @@ Interfejs Pythona do biblioteki LibreDWG.
 %setup -q
 %patch -P0 -p1
 %patch -P1 -p1
+%patch -P2 -p1
 
 # no git-version-gen in release tarball
 %{__sed} -i -e 's/m4_esyscmd(.*git-version-gen.*)/%{version},/' configure.ac
diff --git a/config-update.patch b/config-update.patch
new file mode 100644
index 0000000..0a0e4c7
--- /dev/null
+++ b/config-update.patch
@@ -0,0 +1,43 @@
+From bc79b6445d44db5b5c755be343b728f7d175d932 Mon Sep 17 00:00:00 2001
+From: "Guilherme V. Favretto" <97709742+guifavretto at users.noreply.github.com>
+Date: Tue, 24 Mar 2026 19:43:57 -0300
+Subject: [PATCH] Fix compilation issues on modern systems with GCC
+
+In systems with modern glibc (like Arch Linux), including system
+headers before config.h could lead to _POSIX_C_SOURCE macro
+redefinition errors. Added include guards to config.h and a #ifndef
+protection for _POSIX_C_SOURCE to prevent this.
+
+* configure.ac: Add AH_TOP and AH_BOTTOM for CONFIG_H include guards.
+  Use AH_VERBATIM to wrap _POSIX_C_SOURCE in #ifndef.
+---
+ configure.ac | 9 ++++++++-
+ 1 file changed, 8 insertions(+), 1 deletion(-)
+
+diff --git a/configure.ac b/configure.ac
+index 1148b6b8a4..d12af972ff 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -50,6 +50,9 @@ m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
+ 
+ dnl create a config.h file (Automake will add -DHAVE_CONFIG_H)
+ AC_CONFIG_HEADERS([src/config.h])
++AH_TOP([#ifndef CONFIG_H
++#define CONFIG_H 1])
++AH_BOTTOM([#endif /* CONFIG_H */])
+ AC_MSG_CHECKING([git version])
+ AC_MSG_RESULT($PACKAGE_VERSION)
+ AC_MSG_CHECKING([so version-info])
+@@ -223,7 +226,11 @@ darwin*|macos*)
+     AC_DEFINE([_POSIX_C_SOURCE],[900000L],[Needed for all APPLE extensions])
+     ;;
+ *)
+-    AC_DEFINE([_POSIX_C_SOURCE],[200809L],[Needed for strdup])
++    AH_VERBATIM([_POSIX_C_SOURCE],
++[/* Needed for strdup */
++#ifndef _POSIX_C_SOURCE
++# define _POSIX_C_SOURCE 200809L
++#endif])
+     ;;
+ esac
+ case "$host_os" in
================================================================

---- gitweb:

http://git.pld-linux.org/gitweb.cgi/packages/libredwg.git/commitdiff/4c60499d574c93ae37669e163af411d69eab985b