initial buildroot for linux 5.15

package/libosip2/Config.in

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+config BR2_PACKAGE_LIBOSIP2
+	bool "libosip2"
+	help
+	  GNU SIP (Session Initiation Protocol)
+	  This library aims to provide multimedia and telecom software
+	  developers an easy and powerful interface to initiate and
+	  control SIP based sessions in their applications.
+	  SIP is a open standard replacement from IETF for H323.
+
+	  http://www.gnu.org/software/osip/

package/libosip2/libosip2.hash

@@ -0,0 +1,5 @@
+# Locally calculated after checking pgp signature
+sha256  ee3784bc8e7774f56ecd0e2ca6e3e11d38b373435115baf1f1aa0ca0bfd02bf2  libosip2-5.2.1.tar.gz
+
+# Hash for license file:
+sha256  8d9e95ed0e48df46dc758eb0d86df611f771eab4eed94bebb77dca87f1c897de  COPYING

package/libosip2/libosip2.mk

@@ -0,0 +1,23 @@
+################################################################################
+#
+# libosip2
+#
+################################################################################
+
+LIBOSIP2_VERSION = 5.2.1
+LIBOSIP2_SITE = $(BR2_GNU_MIRROR)/osip
+LIBOSIP2_INSTALL_STAGING = YES
+LIBOSIP2_LICENSE = LGPL-2.1+
+LIBOSIP2_LICENSE_FILES = COPYING
+LIBOSIP2_CPE_ID_VENDOR = gnu
+LIBOSIP2_CPE_ID_PRODUCT = osip
+
+ifeq ($(BR2_arc),y)
+# toolchain __arc__ define conflicts with libosip2 source
+LIBOSIP2_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -U__arc__"
+endif
+
+LIBOSIP2_CONF_OPTS = \
+	--enable-mt=$(if $(BR2_TOOLCHAIN_HAS_THREADS),yes,no)
+
+$(eval $(autotools-package))