initial buildroot for linux 5.15

package/nanomsg/Config.in

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+config BR2_PACKAGE_NANOMSG
+	bool "nanomsg"
+	depends on BR2_TOOLCHAIN_HAS_THREADS
+	help
+	  nanomsg is a socket library that provides several common
+	  communication patterns. It aims to make the networking layer
+	  fast, scalable, and easy to use. Implemented in C, it works
+	  on a wide range of operating systems with no further
+	  dependencies.
+
+	  http://nanomsg.org/
+
+if BR2_PACKAGE_NANOMSG
+
+config BR2_PACKAGE_NANOMSG_TOOLS
+	bool "Build nanomsg tools"
+	help
+	  Build nanomsg tools
+
+endif
+
+comment "nanomsg needs a toolchain w/ threads"
+	depends on !BR2_TOOLCHAIN_HAS_THREADS

package/nanomsg/nanomsg.hash

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+# Locally computed
+sha256 218b31ae1534ab897cb5c419973603de9ca1a5f54df2e724ab4a188eb416df5a  nanomsg-1.1.5.tar.gz
+
+# Hash for license file:
+sha256 4e51f6a04312ea7c5f4f0e92d91b6415c1eeb09bdaf86a6fd11d93499457c07a  COPYING

package/nanomsg/nanomsg.mk

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+################################################################################
+#
+# nanomsg
+#
+################################################################################
+
+NANOMSG_VERSION = 1.1.5
+NANOMSG_SITE = $(call github,nanomsg,nanomsg,$(NANOMSG_VERSION))
+NANOMSG_INSTALL_STAGING = YES
+NANOMSG_LICENSE = MIT
+NANOMSG_LICENSE_FILES = COPYING
+NANOMSG_CONF_OPTS = -DNN_ENABLE_DOC=OFF -DNN_TESTS=OFF
+
+ifeq ($(BR2_STATIC_LIBS),y)
+NANOMSG_CONF_OPTS += -DNN_STATIC_LIB=ON
+endif
+
+ifeq ($(BR2_PACKAGE_NANOMSG_TOOLS),y)
+NANOMSG_CONF_OPTS += -DNN_TOOLS=ON
+else
+NANOMSG_CONF_OPTS += -DNN_TOOLS=OFF
+endif
+
+$(eval $(cmake-package))