From 5a079a2d114f96d4847d1ee305d5b7c16eeec50e Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 27 Dec 2025 12:03:39 -0800
Subject: Initial commit

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+# Building HIDAPI using Autotools (deprecated)
+
+---
+**NOTE**: for all intentions and purposes the Autotools build scripts for HIDAPI are _deprecated_ and going to be obsolete in the future.
+HIDAPI Team recommends using CMake build for HIDAPI.
+If you are already using Autotools build scripts provided by HIDAPI,
+consider switching to CMake build scripts as soon as possible.
+
+---
+
+To be able to use Autotools to build HIDAPI, it has to be [installed](#installing-autotools)/available in the system.
+
+Make sure you've checked [prerequisites](BUILD.md#prerequisites) and installed all required dependencies.
+
+## Installing Autotools
+
+HIDAPI uses few specific tools/packages from Autotools: `autoconf`, `automake`, `libtool`.
+
+On different platforms or package managers, those could be named a bit differently or packaged together.
+You'll have to check the documentation/package list for your specific package manager.
+
+### Linux
+
+On Ubuntu the tools are available via APT:
+
+```sh
+sudo apt install autoconf automake libtool
+```
+
+### FreeBSD
+
+FreeBSD Autotools can be installed as:
+
+```sh
+pkg_add -r autotools
+```
+
+Additionally, on FreeBSD you will need to install GNU make:
+```sh
+pkg_add -r gmake
+```
+
+## Building HIDAPI with Autotools
+
+A simple command list, to build HIDAPI with Autotools as a _shared library_ and install in into your system:
+
+```sh
+./bootstrap # this prepares the configure script
+./configure
+make # build the library
+make install # as root, or using sudo, this will install hidapi into your system
+```
+
+`./configure` can take several arguments which control the build. A few commonly used options:
+```sh
+	--enable-testgui
+		# Enable the build of Foxit-based Test GUI. This requires Fox toolkit to
+		# be installed/available. See README.md#test-gui for remarks.
+
+	--prefix=/usr
+		# Specify where you want the output headers and libraries to
+		# be installed. The example above will put the headers in
+		# /usr/include and the binaries in /usr/lib. The default is to
+		# install into /usr/local which is fine on most systems.
+
+	--disable-shared
+		# By default, both shared and static libraries are going to be built/installed.
+		# This option disables shared library build, if only static library is required.
+```
+
+
+## Cross Compiling
+
+This section talks about cross compiling HIDAPI for Linux using Autotools.
+This is useful for using HIDAPI on embedded Linux targets. These
+instructions assume the most raw kind of embedded Linux build, where all
+prerequisites will need to be built first. This process will of course vary
+based on your embedded Linux build system if you are using one, such as
+OpenEmbedded or Buildroot.
+
+For the purpose of this section, it will be assumed that the following
+environment variables are exported.
+```sh
+$ export STAGING=$HOME/out
+$ export HOST=arm-linux
+```
+
+`STAGING` and `HOST` can be modified to suit your setup.
+
+### Prerequisites
+
+Depending on what backend you want to cross-compile, you also need to prepare the dependencies:
+`libusb` for libusb HIDAPI backend, or `libudev` for hidraw HIDAPI backend.
+
+An example of cross-compiling `libusb`. From `libusb` source directory, run:
+```sh
+./configure --host=$HOST --prefix=$STAGING
+make
+make install
+```
+
+An example of cross-comping `libudev` is not covered by this section.
+Check `libudev`'s documentation for details.
+
+### Building HIDAPI
+
+Build HIDAPI:
+```sh
+PKG_CONFIG_DIR= \
+PKG_CONFIG_LIBDIR=$STAGING/lib/pkgconfig:$STAGING/share/pkgconfig \
+PKG_CONFIG_SYSROOT_DIR=$STAGING \
+./configure --host=$HOST --prefix=$STAGING
+# make / make install - same as for a regular build
+```
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