initial buildroot for linux 5.15

package/gsl/Config.in

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+config BR2_PACKAGE_GSL
+	bool "gsl"
+	help
+	  The GNU Scientific Library (GSL) is a numerical library for
+	  C and C++ programmers. The library provides a wide range of
+	  mathematical routines such as random number generators,
+	  special functions and least-squares fitting. There are over
+	  1000 functions in total with an extensive test suite.
+
+	  http://www.gnu.org/software/gsl

package/gsl/gsl.hash

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+# Locally calculated after checking pgp signature
+sha256  b782339fc7a38fe17689cb39966c4d821236c28018b6593ddb6fd59ee40786a8  gsl-2.6.tar.gz
+sha256  8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903  COPYING

package/gsl/gsl.mk

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+################################################################################
+#
+# gsl
+#
+################################################################################
+
+GSL_VERSION = 2.6
+GSL_SITE = $(BR2_GNU_MIRROR)/gsl
+GSL_INSTALL_STAGING = YES
+GSL_LICENSE = GPL-3.0
+GSL_LICENSE_FILES = COPYING
+GSL_CONFIG_SCRIPTS = gsl-config
+
+# uClibc pretends to have fenv support as it installs <fenv.h>, but in
+# practice, it only implements it for i386. Problem reported upstream
+# at: http://lists.busybox.net/pipermail/uclibc/2012-October/047067.html.
+# So we tell gsl that fenv related functions are not available in this
+# case.
+ifeq ($(BR2_TOOLCHAIN_USES_UCLIBC),y)
+ifneq ($(BR2_i386),y)
+GSL_CONF_ENV = \
+	ac_cv_have_decl_feenableexcept=no \
+	ac_cv_have_decl_fesettrapenable=no
+endif
+endif
+
+$(eval $(autotools-package))