fix implicit declarations due to missing include

openscap-1.3.9-includes.patch

@@ -0,0 +1,33 @@
+diff -ru openscap-1.3.9/src/common/xml_iterate.c openscap-1.3.9.new/src/common/xml_iterate.c
+--- openscap-1.3.9/src/common/xml_iterate.c	2023-09-06 16:04:46.000000000 +0200
++++ openscap-1.3.9.new/src/common/xml_iterate.c	2023-11-27 03:13:21.931933518 +0100
+@@ -22,6 +22,7 @@
+ #endif
+ 
+ #include <string.h>
++#include <libxml/parser.h>
+ #include "debug_priv.h"
+ #include "xml_iterate.h"
+ #include "oscap_helpers.h"
+diff -ru openscap-1.3.9/src/OVAL/results/oval_cmp_evr_string.c openscap-1.3.9.new/src/OVAL/results/oval_cmp_evr_string.c
+--- openscap-1.3.9/src/OVAL/results/oval_cmp_evr_string.c	2023-09-06 16:04:46.000000000 +0200
++++ openscap-1.3.9.new/src/OVAL/results/oval_cmp_evr_string.c	2023-11-27 03:18:23.003882498 +0100
+@@ -30,6 +30,7 @@
+ #include <math.h>
+ #include <string.h>
+ #include <ctype.h>
++#include <limits.h>
+ #include "oval_cmp_evr_string_impl.h"
+ #include "oval_definitions.h"
+ #include "oval_types.h"
+diff -ru openscap-1.3.9/src/source/bz2.c openscap-1.3.9.new/src/source/bz2.c
+--- openscap-1.3.9/src/source/bz2.c	2023-09-06 16:04:46.000000000 +0200
++++ openscap-1.3.9.new/src/source/bz2.c	2023-11-27 03:32:20.069323771 +0100
+@@ -26,6 +26,7 @@
+ #endif
+ 
+ #include <libxml/tree.h>
++#include <libxml/parser.h>
+ #include <stdlib.h>
+ #include <string.h>
+ #ifdef OS_WINDOWS

openscap.spec

@@ -19,6 +19,9 @@ Source0:        https://github.com/OpenSCAP/%{name}/releases/download/%{version}
 Patch1:         openscap-1.3.9-perlpath.patch
 
 
+# Implicit declarations due to missing includes
+Patch2:         openscap-1.3.9-includes.patch
+
 BuildRequires:  make
 BuildRequires:  cmake >= 2.6
 BuildRequires:  gcc
@@ -168,7 +171,6 @@ Tool for scanning Atomic containers.
 %build
 # gconf is a legacy system not used any more, and it blocks testing of oscap-anaconda-addon
 # as gconf is no longer part of the installation medium
-export CFLAGS="$CFLAGS -Wno-error=implicit-function-declaration"
 %cmake \
     -DWITH_PCRE2=ON \
     -DENABLE_PERL=ON \