Upgrade buildroot to 2023.05 (from 2021.08.2), kernel is upgraded to 6.3 (from 5.13.19).

package/sdbus-cpp/Config.in

@@ -0,0 +1,16 @@
+config BR2_PACKAGE_SDBUS_CPP
+	bool "sdbus-c++"
+	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_PACKAGE_SYSTEMD
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_7 # C++17
+	help
+	  sdbus-c++ is a high-level C++ D-Bus library for Linux
+	  designed to provide expressive, easy-to-use API in modern C++.
+
+	  This will build the target library.
+
+	  https://github.com/Kistler-Group/sdbus-cpp
+
+comment "sdbus-c++ needs systemd and a toolchain w/ C++, gcc >= 7"
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_PACKAGE_SYSTEMD || \
+		!BR2_TOOLCHAIN_GCC_AT_LEAST_7

package/sdbus-cpp/sdbus-cpp.hash

@@ -0,0 +1,4 @@
+# Locally computed:
+sha256  7f7231904abb6a996b8c18ddc5fb50078ef5dff5191649abf9f127aff41d24e9  v1.2.0.tar.gz
+sha256  20c17d8b8c48a600800dfd14f95d5cb9ff47066a9641ddeab48dc54aec96e331  COPYING
+sha256  be43debbf06a38325616054a39e44ed5afde4ed21b99de197488a4a306d47e39  COPYING-LGPL-Exception

package/sdbus-cpp/sdbus-cpp.mk

@@ -0,0 +1,15 @@
+################################################################################
+#
+# sdbus-c++
+#
+################################################################################
+
+SDBUS_CPP_VERSION = 1.2.0
+SDBUS_CPP_SOURCE = v$(SDBUS_CPP_VERSION).tar.gz
+SDBUS_CPP_SITE = $(call github,Kistler-Group,sdbus-cpp,v$(SDBUS_CPP_VERSION))
+SDBUS_CPP_INSTALL_STAGING = YES
+SDBUS_CPP_DEPENDENCIES = host-pkgconf systemd
+SDBUS_CPP_LICENSE = LGPL-2.1+ with exception (headers)
+SDBUS_CPP_LICENSE_FILES = COPYING COPYING-LGPL-Exception
+
+$(eval $(cmake-package))