Yocto 2.4.2 cannot do_rootfs because of dependent package - yocto

Question

I am working with Yocto 2.4.2 (rocko), Ubuntu 14.04 LTS, Linux kernel LTSI 4.4, arm cortexA15. There are many issues while building core-image-weston. One of them is:
ERROR: core-image-weston-1.0-r0 do_rootfs: Unable to install packages. Command '/home/server-build/RZG_YoctoProject/build/tmp/work/iwg20m-poky-linux-gnueabi/core-image-weston/1.0-r0/recipe-sysroot-native/usr/bin/opkg --volatile-cache -f /home/server-build/RZG_YoctoProject/build/tmp/work/iwg20m-poky-linux-gnueabi/core-image-weston/1.0-r0/opkg.conf -t /home/server-build/RZG_YoctoProject/build/tmp/work/iwg20m-poky-linux-gnueabi/core-image-weston/1.0-r0/temp/ipktemp/ -o /home/server-build/RZG_YoctoProject/build/tmp/work/iwg20m-poky-linux-gnueabi/core-image-weston/1.0-r0/rootfs --force_postinstall --prefer-arch-to-version install
libkms1
run-postinsts
gstreamer1.0-plugins-good-video4linux2
weston
opkg
psplash
libclutter-1.0-examples
alsa-tools
gtk+3-demo
gles-user-module
packagegroup-core-boot
libdrm-tests
kernel-module-gles
alsa-utils
weston-init
packagegroup-base-extended
bash
packagegroup-core-ssh-dropbear'
returned 2:
Collected errors:
* Solver encountered 2 problem(s):
* Problem 1/2:
- nothing provides libgbm >= 1.0 needed by weston-2.0.0-r0.cortexa15hf-neon
* Solution 1:
- do not ask to install a package providing weston
* Problem 2/2:
- nothing provides libgbm >= 1.0 needed by weston-2.0.0-r0.cortexa15hf-neon
* Solution 1:
- do not ask to install a package providing weston-init
ERROR: core-image-weston-1.0-r0 do_rootfs: Function failed: do_rootfs
ERROR: Logfile of failure stored in: /home/server-build/RZG_YoctoProject/build/tmp/work/iwg20m-poky-linux-gnueabi/core-image-weston/1.0-r0/temp/log.do_rootfs.20697
ERROR: Task (/home/server-build/RZG_YoctoProject/build/../poky/meta/recipes-graphics/images/core-image-weston.bb:do_rootfs) failed with exit code '1'
NOTE: Tasks Summary: Attempted 3411 tasks of which 3410 didn't need to be rerun and 1 failed.
Summary: 1 task failed:
/home/server-build/RZG_YoctoProject/build/../poky/meta/recipes-graphics/images/core-image-weston.bb:do_rootfs
The packages weston and weston-init require libgbm >= 1.0. In our current system, libgbm.bb was already existent. And, I can build libgbm succesfully.
SUMMARY = "gbm library"
LICENSE = "MIT"
SECTION = "libs"
LIC_FILES_CHKSUM = "file://gbm.c;beginline=4;endline=22;md5=5cdaac262c876e98e47771f11c7036b5"
SRCREV = "84984e873a134ee67b4c99859f052bb42834245c"
SRC_URI = "git://github.com/thayama/libgbm;protocol=git;branch=master"
PV = "1.0"
S = "${WORKDIR}/git"
DEPENDS = "wayland-kms udev"
inherit autotools pkgconfig
PACKAGES = " \
${PN} \
${PN}-dev \
${PN}-dbg \
${PN}-staticdev \
"
FILES_${PN} = " \
${libdir}/libgbm.so.* \
${libdir}/gbm/libgbm_kms.so.* \
${libdir}/gbm/*.so \
${libdir}/*.so \
"
PROVIDES += "gbm"
FILES_${PN}-dev += "${libdir}/gbm/*.la"
FILES_${PN}-dbg += "${libdir}/gbm/.debug/*"
FILES_${PN}-staticdev += "${libdir}/gbm/*.a"
INSANE_SKIP_${PN} += "dev-so"
But the error happened. Could you help ? Thanks!