initial buildroot for linux 5.15

package/netcat-openbsd/Config.in

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+config BR2_PACKAGE_NETCAT_OPENBSD
+	bool "netcat-openbsd"
+	depends on BR2_PACKAGE_LIBBSD_ARCH_SUPPORTS
+	depends on !BR2_STATIC_LIBS # libbsd
+	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_TOOLCHAIN_USES_GLIBC
+	depends on BR2_PACKAGE_BUSYBOX_SHOW_OTHERS
+	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
+	select BR2_PACKAGE_LIBBSD
+	help
+	  A simple Unix utility which reads and writes data across
+	  network connections using TCP or UDP protocol. It is
+	  designed to be a reliable "back-end" tool that can be used
+	  directly or easily driven by other programs and scripts. At
+	  the same time it is a feature-rich network debugging and
+	  exploration tool, since it can create almost any kind of
+	  connection you would need and has several interesting
+	  built-in capabilities.
+
+	  This package contains the OpenBSD rewrite of netcat,
+	  including support for IPv6, proxies, and Unix sockets.
+
+	  https://packages.debian.org/sid/netcat-openbsd
+
+comment "netcat-openbsd needs a glibc toolchain w/ dynamic library, threads, headers >= 3.12"
+	depends on BR2_PACKAGE_LIBBSD_ARCH_SUPPORTS
+	depends on BR2_STATIC_LIBS || !BR2_TOOLCHAIN_HAS_THREADS || \
+		!BR2_TOOLCHAIN_USES_GLIBC || \
+		!BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
+	depends on BR2_PACKAGE_BUSYBOX_SHOW_OTHERS

package/netcat-openbsd/netcat-openbsd.hash

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+# Locally calculated
+sha256  55e578f652cbf6ffc95f75ea3e2645ab335fab63649568bd7cdb0a6331ca87de  netcat-openbsd-debian_1.195-2-br1.tar.gz
+sha256  e2e86d58c38f044a49f51e45515747585db58a2305419c73323eaad88fcaef5c  debian/copyright

package/netcat-openbsd/netcat-openbsd.mk

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+################################################################################
+#
+# netcat-openbsd
+#
+################################################################################
+
+NETCAT_OPENBSD_VERSION = debian/1.195-2
+NETCAT_OPENBSD_SITE = https://salsa.debian.org/debian/netcat-openbsd.git
+NETCAT_OPENBSD_SITE_METHOD = git
+NETCAT_OPENBSD_LICENSE = BSD-3-Clause
+NETCAT_OPENBSD_LICENSE_FILES = debian/copyright
+NETCAT_OPENBSD_DEPENDENCIES = host-pkgconf libbsd
+
+define NETCAT_OPENBSD_APPLY_DEBIAN_PATCHES
+	if [ -d $(@D)/debian/patches ]; then \
+		$(APPLY_PATCHES) $(@D) $(@D)/debian/patches *.dpatch; \
+	fi
+endef
+
+NETCAT_OPENBSD_POST_PATCH_HOOKS += NETCAT_OPENBSD_APPLY_DEBIAN_PATCHES
+
+define NETCAT_OPENBSD_BUILD_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) $(TARGET_CONFIGURE_OPTS) -C $(@D)
+endef
+
+define NETCAT_OPENBSD_INSTALL_TARGET_CMDS
+	$(INSTALL) -m 755 -D $(@D)/nc $(TARGET_DIR)/usr/bin/nc
+endef
+
+$(eval $(generic-package))