[Buildroot] [PATCH] package/openscap: fix build failure with dbus and musl

The openscap build can fail with the following error:

In file included from [...]/src/OVAL/probes/unix/linux/systemdunitproperty_probe.c:38:
[...]/src/OVAL/probes/unix/linux/systemdshared.h: In function ‘get_all_systemd_units’:
[...]/src/OVAL/probes/unix/linux/systemdshared.h:188:50: error: implicit declaration of function ‘basename’; did you mean ‘rename’? [-Wimplicit-function-declaration]
  188 |                 char *unit_name_s = oscap_strdup(basename(value.str));
      |                                                  ^~~~~~~~
      |                                                  rename
In file included from [...]/src/OVAL/probes/unix/linux/systemdunitdependency_probe.c:37:
[...]/src/OVAL/probes/unix/linux/systemdshared.h: In function ‘get_all_systemd_units’:
[...]/src/OVAL/probes/unix/linux/systemdshared.h:188:50: error: implicit declaration of function ‘basename’; did you mean ‘rename’? [-Wimplicit-function-declaration]
  188 |                 char *unit_name_s = oscap_strdup(basename(value.str));
      |                                                  ^~~~~~~~
      |                                                  rename

This error happens when:
- dbus is enabled in the configuration, making openscap build probes
  code
- the toolchain uses musl, which does not declare basename() in string.h
  the way glibc does

The build error can be reproduced with the following minimal defconfig:

  BR2_arm=y
  BR2_cortex_a9=y
  BR2_ARM_ENABLE_NEON=y
  BR2_ARM_ENABLE_VFP=y
  BR2_TOOLCHAIN_EXTERNAL=y
  BR2_TOOLCHAIN_EXTERNAL_BOOTLIN=y
  BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_ARMV7_EABIHF_MUSL_BLEEDING_EDGE=y
  BR2_PACKAGE_DBUS=y
  BR2_PACKAGE_OPENSCAP=y

Backport the upstream fix to allow openscap to build with such
configuration. The custom patch can be removed once openscap is
re-released on its branch 1.3.x.

Fixes: https://autobuild.buildroot.org/results/a874d4f34d36fa9f8566be90ad2d5facb99aec24/
Signed-off-by: Alexis Lothoré <[email protected]>
---
The issue affects master, 2026.05.x and 2025.02.x
---
 ...02-OVAL-probes-add-missing-header-include.patch | 48 ++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/package/openscap/0002-OVAL-probes-add-missing-header-include.patch b/package/openscap/0002-OVAL-probes-add-missing-header-include.patch
new file mode 100644
index 000000000000..0c7598b2b5e1
--- /dev/null
+++ b/package/openscap/0002-OVAL-probes-add-missing-header-include.patch
@@ -0,0 +1,48 @@
+From ab69b76cb40d6f35d252246e965245804b17591f Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Alexis=20Lothor=C3=A9?= <[email protected]>
+Date: Thu, 13 Aug 2026 15:18:15 +0200
+Subject: [PATCH] OVAL/probes: add missing header include
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Openscap build can fail with the following log when
+-Wimplicit-function-declaration is turned into an error:
+
+In file included from [...]/src/OVAL/probes/unix/linux/systemdunitproperty_probe.c:38:
+[...]/src/OVAL/probes/unix/linux/systemdshared.h: In function ‘get_all_systemd_units’:
+[...]/src/OVAL/probes/unix/linux/systemdshared.h:188:50: error: implicit declaration of function ‘basename’; did you mean ‘rename’? [-Wimplicit-function-declaration]
+  188 |                 char *unit_name_s = oscap_strdup(basename(value.str));
+      |                                                  ^~~~~~~~
+      |                                                  rename
+In file included from [...]/src/OVAL/probes/unix/linux/systemdunitdependency_probe.c:37:
+[...]/src/OVAL/probes/unix/linux/systemdshared.h: In function ‘get_all_systemd_units’:
+[...]/src/OVAL/probes/unix/linux/systemdshared.h:188:50: error: implicit declaration of function ‘basename’; did you mean ‘rename’? [-Wimplicit-function-declaration]
+  188 |                 char *unit_name_s = oscap_strdup(basename(value.str));
+      |                                                  ^~~~~~~~
+      |                                                  rename
+
+Add the missing header include pointed by `man 3 basename` to fix the
+error.
+
+Upstream: https://github.com/OpenSCAP/openscap/commit/ab69b76cb40d6f35d252246e965245804b17591f
+Signed-off-by: Alexis Lothoré <[email protected]>
+---
+ src/OVAL/probes/unix/linux/systemdshared.h | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/src/OVAL/probes/unix/linux/systemdshared.h b/src/OVAL/probes/unix/linux/systemdshared.h
+index 879ae5be9d6c..57e94ca6f49e 100644
+--- a/src/OVAL/probes/unix/linux/systemdshared.h
++++ b/src/OVAL/probes/unix/linux/systemdshared.h
+@@ -35,6 +35,7 @@
+ #include <config.h>
+ #endif
+ 
++#include <libgen.h>
+ #include <limits.h>
+ #include <stdio.h>
+ #include "common/debug_priv.h"
+-- 
+2.55.0
+

---
base-commit: 679b9ead7620bbf193620d1ebf56f53c1764d37a
change-id: 20260814-openscap_musl_dbus-32ab8a575a49

Best regards,
--  
Alexis Lothoré <[email protected]>

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