initial buildroot for linux 5.15

package/libsigc/Config.in

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+config BR2_PACKAGE_LIBSIGC
+	bool "libsigc++"
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 # C++11
+	depends on BR2_INSTALL_LIBSTDCPP
+	help
+	  libsigc++ implements a typesafe callback system for standard
+	  C++. It allows you to define signals and to connect those
+	  signals to any callback function, either global or a member
+	  function, regardless of whether it is static or virtual.
+
+	  https://libsigcplusplus.github.io/libsigcplusplus/
+
+comment "libsigc++ needs a toolchain w/ C++, gcc >= 4.8"
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_8

package/libsigc/libsigc.hash

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+# From http://ftp.gnome.org/pub/gnome/sources/libsigc++/2.10/libsigc++-2.10.6.sha256sum
+sha256  dda176dc4681bda9d5a2ac1bc55273bdd381662b7a6d49e918267d13e8774e1b  libsigc++-2.10.6.tar.xz
+
+# Locally calculated
+sha256  5bbcbb737e60fe9deba08ecbd00920cfcc3403ba2e534c64fdeea49d6bb87509  COPYING

package/libsigc/libsigc.mk

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+################################################################################
+#
+# libsigc
+#
+################################################################################
+
+LIBSIGC_VERSION_MAJOR = 2.10
+LIBSIGC_VERSION = $(LIBSIGC_VERSION_MAJOR).6
+LIBSIGC_SOURCE = libsigc++-$(LIBSIGC_VERSION).tar.xz
+LIBSIGC_SITE = http://ftp.gnome.org/pub/GNOME/sources/libsigc++/$(LIBSIGC_VERSION_MAJOR)
+LIBSIGC_INSTALL_STAGING = YES
+LIBSIGC_LICENSE = LGPL-2.1+
+LIBSIGC_LICENSE_FILES = COPYING
+LIBSIGC_CONF_OPTS = \
+	-Dbuild-examples=false \
+	-Dvalidation=false
+
+$(eval $(meson-package))