在安装cgminer后，编译openwrt源码报错在安装cgmner是缺失依赖库udev：
解决方式：在openwrt-cgminer\allcode\openwrt\feeds\packages\utils路径下增加eudev文件夹
eudev目录下有一些patches、配置文件以及makefile文件
Makefile文件中会说明安装包的一些信息：
#
# Copyright (C) 2006-2008 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
include $(TOPDIR)/rules.mk
PKG_NAME:=eudev
PKG_VERSION:=3.2
PKG_RELEASE:=1
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
PKG_SOURCE_URL:=http://dev.gentoo.org/~blueness/eudev/
PKG_MD5SUM:=7e42d9b9ed8162021665139520676367
PKG_LICENSE:=GPL-2.0
include $(INCLUDE_DIR)/package.mk
PKG_BUILD_DEPENDS:=gperf/host
PKG_FIXUP:=autoreconf
PKG_INSTALL=1
define Package/libudev
SECTION:=libs
CATEGORY:=Libraries
TITLE:=Dynamic device management subsystem
URL:=https://wiki.gentoo.org/wiki/Project:Eudev
MAINTAINER:=Daniel Golle <daniel@makrotopia.org>
endef
define Package/eudev
SECTION:=base
CATEGORY:=Base system
TITLE:=Dynamic device management subsystem
URL:=https://wiki.gentoo.org/wiki/Project:Eudev
MAINTAINER:=Daniel Golle <daniel@makrotopia.org>
MENU:=1
DEPENDS:=+EUDEV_EXTRA_blkid:libblkid +EUDEV_EXTRA_kmod:libkmod +librt +libudev
PROVIDES:=udev
CONFLICTS:=udev
endef
define Package/eudev/description
udev allows Linux users to have a dynamic /dev directory and it
provides the ability to have persistent device names.
eudev is a fork of systemd-udev with the goal of obtaining better
compatibility with existing software such as OpenRC and Upstart, older
kernels, various toolchains and anything else required by users and
various distributions.
endef
define Package/eudev/conffiles
/etc/udev/udev.conf
endef
define Package/eudev/config
source "$(SOURCE)/Config.in"
endef
CONFIGURE_ARGS += --prefix=/usr --exec-prefix= --sysconfdir=/etc --libexecdir=/lib/udev --sbindir=/sbin --disable-hwdb --disable-introspection --disable-manpages --disable-selinux $(if $(CONFIG_EUDEV_EXTRA_blkid),--enable-blkid,--disable-blkid) $(if $(CONFIG_EUDEV_EXTRA_kmod),--enable-kmod,--disable-kmod)
eudev-extra-lib-bin-$(CONFIG_EUDEV_EXTRA_ata_id) += ata_id
eudev-extra-rules-$(CONFIG_EUDEV_EXTRA_blkid) += 60-persistent-storage.rules
eudev-extra-lib-bin-$(CONFIG_EUDEV_EXTRA_cdrom_id) += cdrom_id
eudev-extra-rules-$(CONFIG_EUDEV_EXTRA_cdrom_id) += 60-cdrom_id.rules
eudev-extra-lib-bin-$(CONFIG_EUDEV_EXTRA_collect) += collect
eudev-extra-rules-$(CONFIG_EUDEV_EXTRA_input_id) += 60-persistent-input.rules
eudev-extra-lib-bin-$(CONFIG_EUDEV_EXTRA_mtd_probe) += mtd_probe
eudev-extra-rules-$(CONFIG_EUDEV_EXTRA_mtd_probe) += 75-probe_mtd.rules
eudev-extra-lib-bin-$(CONFIG_EUDEV_EXTRA_scsi_id) += scsi_id
eudev-extra-lib-bin-$(CONFIG_EUDEV_EXTRA_v4l_id) += v4l_id
eudev-extra-rules-$(CONFIG_EUDEV_EXTRA_v4l_id) += 60-persistent-v4l.rules
define Build/InstallDev
$(INSTALL_DIR) $(1)/usr/include
$(CP) $(PKG_INSTALL_DIR)/usr/include/libudev.h $(1)/usr/include
$(INSTALL_DIR) $(1)/usr/share/pkgconfig
$(CP) $(PKG_INSTALL_DIR)/usr/share/pkgconfig/udev.pc $(1)/usr/share/pkgconfig
$(INSTALL_DIR) $(1)/lib
$(CP) $(PKG_INSTALL_DIR)/lib/libudev.so* $(1)/lib
$(INSTALL_DIR) $(1)/usr/lib/pkgconfig
$(CP) $(PKG_INSTALL_DIR)/lib/pkgconfig/libudev.pc $(1)/usr/lib/pkgconfig
endef
define Package/libudev/install
$(INSTALL_DIR) $(1)/lib
$(CP) $(PKG_INSTALL_DIR)/lib/libudev.so* $(1)/lib
endef
define Package/eudev/install
$(INSTALL_DIR) $(1)/etc/udev/rules.d
$(INSTALL_DATA) $(PKG_INSTALL_DIR)/etc/udev/udev.conf $(1)/etc/udev
$(INSTALL_DIR) $(1)/sbin
$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/bin/udevadm $(PKG_INSTALL_DIR)/sbin/udevd $(1)/sbin
$(INSTALL_DIR) $(1)/lib/udev/rules.d
$(INSTALL_DATA) $(addprefix $(PKG_INSTALL_DIR)/lib/udev/rules.d/, $(eudev-extra-rules-y)) $(addprefix $(PKG_INSTALL_DIR)/lib/udev/rules.d/, 50-udev-default.rules 60-block.rules 60-drm.rules 60-evdev.rules 60-persistent-alsa.rules 60-persistent-storage-tape.rules 60-serial.rules 64-btrfs.rules 70-mouse.rules 75-net-description.rules 78-sound-card.rules 80-net-name-slot.rules) $(1)/lib/udev/rules.d
ifneq ($(eudev-extra-lib-bin-y),)
$(INSTALL_BIN) $(addprefix $(PKG_INSTALL_DIR)/lib/udev/, $(eudev-extra-lib-bin-y)) $(1)/lib/udev/
endif
endef
$(eval $(call BuildPackage,eudev))
$(eval $(call BuildPackage,libudev))
具体makefile文件编写的格式可参考：
https://www.freesion.com/article/3323420807/
这个eudev文件是我从其他源码中拷贝的。
然后执行下面两条命令：
./script/feeds update packages
./script/feeds install -a -p packages
在执行第二条命令时就可以看到打印信息显示eudev安装成功。
这个时候make menuconfig进去libraries项可以看到libudev的配置。
在.packageinfo文件中也可以看到这个库的具体信息：
从上述信息可以看出安装包名字为eudev-3.2.tar.gz。此时我会拷贝一个eudev包到dl文件夹中去，在编译时就会直接使用，不用编译时才下，缩短编译时间。
原文：https://www.cnblogs.com/yuanqiangfei/p/14705185.html