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On recent Linux distros like Ubuntu Noble and Debian Bookworm, the 'pkg-config-aarch64-linux-gnu' package is missing. As a result, the aarch64-linux-gnu-pkg-config command is not available, which causes build failures. When a build passes the environment variables PKG_CONFIG_LIBDIR or PKG_CONFIG_PATH, like a user uses make command or a build system (like Yocto, Buildroot, etc) prepares the variables and passes to the Perf's Makefile, the commit keeps these variables for package configuration. Otherwise, this commit sets the PKG_CONFIG_LIBDIR variable to use the Multiarch libs for the cross compilation. Signed-off-by: Leo Yan <leo.yan@arm.com> Tested-by: Ian Rogers <irogers@google.com> Cc: amadio@gentoo.org Cc: Thomas Richter <tmricht@linux.ibm.com> Link: https://lore.kernel.org/r/20240717082211.524826-2-leo.yan@arm.com Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.