initial buildroot for linux 5.15

package/opkg/Config.in

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+comment "opkg needs a toolchain w/ wchar"
+	depends on BR2_USE_MMU
+	depends on !BR2_USE_WCHAR
+
+config BR2_PACKAGE_OPKG
+	bool "opkg"
+	depends on BR2_USE_MMU # fork()
+	depends on BR2_USE_WCHAR # libarchive
+	select BR2_PACKAGE_LIBARCHIVE
+	help
+	  Opkg is a lightweight package management system, based on
+	  ipkg. It is written in C and resembles apt/dpkg in
+	  operation. It is intended for use on embedded Linux devices.
+	  Opkg is maintained, stable, robust and conservative in its
+	  memory usage, despite its buggy ipkg ancestry. As best it
+	  can, opkg maintains backwards compatibility with ipkg and
+	  conforms to a subset of debian's policy manual regarding
+	  control files.
+
+	  https://code.google.com/archive/p/opkg/
+
+if BR2_PACKAGE_OPKG
+
+config BR2_PACKAGE_OPKG_GPG_SIGN
+	bool "gnupg support"
+	depends on BR2_PACKAGE_LIBGPG_ERROR_ARCH_SUPPORTS # libgpg-error
+	select BR2_PACKAGE_LIBGPGME
+	select BR2_PACKAGE_LIBGPG_ERROR
+	help
+	  Enable opkg package signature checking support using
+	  gnupg/libgpgme.
+
+endif

package/opkg/opkg.hash

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+# From http://downloads.yoctoproject.org/releases/opkg/SHA256SUMS
+sha256  a1214a75fa34fb9228db8da47308e0e711b1c93fd8938cf164c10fd28eb50f1e  opkg-0.4.5.tar.gz
+# Locally calculated
+sha256  32b1062f7da84967e7019d01ab805935caa7ab7321a7ced0e30ebe75e5df1670  COPYING

package/opkg/opkg.mk

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+################################################################################
+#
+# opkg
+#
+################################################################################
+
+OPKG_VERSION = 0.4.5
+OPKG_SITE = https://downloads.yoctoproject.org/releases/opkg
+OPKG_DEPENDENCIES = host-pkgconf libarchive
+OPKG_LICENSE = GPL-2.0+
+OPKG_LICENSE_FILES = COPYING
+OPKG_INSTALL_STAGING = YES
+OPKG_CONF_OPTS = --disable-curl
+
+# Ensure directory for lockfile exists
+define OPKG_CREATE_LOCKDIR
+	mkdir -p $(TARGET_DIR)/usr/lib/opkg
+endef
+
+ifeq ($(BR2_PACKAGE_OPKG_GPG_SIGN),y)
+OPKG_CONF_OPTS += --enable-gpg
+OPKG_CONF_ENV += \
+	ac_cv_path_GPGME_CONFIG=$(STAGING_DIR)/usr/bin/gpgme-config \
+	ac_cv_path_GPGERR_CONFIG=$(STAGING_DIR)/usr/bin/gpg-error-config
+OPKG_DEPENDENCIES += libgpgme libgpg-error
+else
+OPKG_CONF_OPTS += --disable-gpg
+endif
+
+OPKG_POST_INSTALL_TARGET_HOOKS += OPKG_CREATE_LOCKDIR
+
+$(eval $(autotools-package))