[Mod] First commit

package/libsigc/Config.in

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+config BR2_PACKAGE_LIBSIGC
+	bool "libsigc++"
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_7 # C++17
+	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 >= 7"
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_GCC_AT_LEAST_7

package/libsigc/libsigc.hash

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+# From http://ftp.gnome.org/pub/gnome/sources/libsigc++/3.0/libsigc++-3.0.7.sha256sum
+sha256  bfbe91c0d094ea6bbc6cbd3909b7d98c6561eea8b6d9c0c25add906a6e83d733  libsigc++-3.0.7.tar.xz
+
+# Locally calculated
+sha256  97628afebc60f026f5c2b25d7491c46a5c4ee61f693e7cfa07fbd2c03605979b  COPYING

package/libsigc/libsigc.mk

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+################################################################################
+#
+# libsigc
+#
+################################################################################
+
+LIBSIGC_VERSION_MAJOR = 3.0
+LIBSIGC_VERSION = $(LIBSIGC_VERSION_MAJOR).7
+LIBSIGC_SOURCE = libsigc++-$(LIBSIGC_VERSION).tar.xz
+LIBSIGC_SITE = http://ftp.gnome.org/pub/GNOME/sources/libsigc++/$(LIBSIGC_VERSION_MAJOR)
+LIBSIGC_INSTALL_STAGING = YES
+LIBSIGC_LICENSE = LGPL-3.0+
+LIBSIGC_LICENSE_FILES = COPYING
+LIBSIGC_CONF_OPTS = \
+	-Dbuild-examples=false \
+	-Dvalidation=false
+
+$(eval $(meson-package))