Applying ./patches/010-distutils.patch using plaintext: 
patching file meson.build

Applying ./patches/020-ffmpeg5.patch using plaintext: 
patching file ext/libav/gstavauddec.c
patching file ext/libav/gstavaudenc.c
patching file ext/libav/gstavcodecmap.c
patching file ext/libav/gstavutils.c
patching file ext/libav/gstavviddec.c
patching file ext/libav/gstavvidenc.c
The Meson build system
Version: 0.61.4
Source dir: /builder/shared-workdir/build/sdk/build_dir/target-arm_cortex-a7_musl_eabi/gst-libav-1.18.5
Build dir: /builder/shared-workdir/build/sdk/build_dir/target-arm_cortex-a7_musl_eabi/gst-libav-1.18.5/openwrt-build
Build type: cross build
Project name: gst-libav
Project version: 1.18.5
C compiler for the host machine: arm-openwrt-linux-muslgnueabi-gcc (gcc 11.2.0 "arm-openwrt-linux-muslgnueabi-gcc (OpenWrt GCC 11.2.0 r20231-1fa6b2639c) 11.2.0")
C linker for the host machine: arm-openwrt-linux-muslgnueabi-gcc ld.bfd 2.37
C++ compiler for the host machine: arm-openwrt-linux-muslgnueabi-g++ (gcc 11.2.0 "arm-openwrt-linux-muslgnueabi-g++ (OpenWrt GCC 11.2.0 r20231-1fa6b2639c) 11.2.0")
C++ linker for the host machine: arm-openwrt-linux-muslgnueabi-g++ ld.bfd 2.37
C compiler for the build machine: gcc (gcc 10.2.1 "gcc (Debian 10.2.1-6) 10.2.1 20210110")
C linker for the build machine: gcc ld.bfd 2.35.2
C++ compiler for the build machine: g++ (gcc 10.2.1 "g++ (Debian 10.2.1-6) 10.2.1 20210110")
C++ linker for the build machine: g++ ld.bfd 2.35.2
Build machine cpu family: x86_64
Build machine cpu: x86_64
Host machine cpu family: arm
Host machine cpu: generic
Target machine cpu family: arm
Target machine cpu: generic
Found pkg-config: /builder/shared-workdir/build/sdk/staging_dir/host/bin/pkg-config (1.8.0)
Run-time dependency libavfilter found: YES 8.44.100
Run-time dependency libavformat found: YES 59.27.100
Run-time dependency libavcodec found: YES 59.37.100
Run-time dependency libavutil found: YES 57.28.100
Checking if "libav is provided by FFmpeg" with dependencies libavfilter, libavformat, libavcodec, libavutil compiles: YES 
Has header "unistd.h" : YES 
Found CMake: /builder/shared-workdir/build/sdk/staging_dir/host/bin/cmake (3.22.3)
Run-time dependency gstreamer-1.0 found: NO (tried pkgconfig and cmake)
Looking for a fallback subproject for the dependency gstreamer-1.0

../../../../build_dir/target-arm_cortex-a7_musl_eabi/gst-libav-1.18.5/meson.build:83:0: ERROR: Neither a subproject directory nor a gstreamer.wrap file was found.

A full log can be found at /builder/shared-workdir/build/sdk/build_dir/target-arm_cortex-a7_musl_eabi/gst-libav-1.18.5/openwrt-build/meson-logs/meson-log.txt
make[3]: *** [Makefile:219: /builder/shared-workdir/build/sdk/build_dir/target-arm_cortex-a7_musl_eabi/gst-libav-1.18.5/.configured_c3004cb90b7a2c340455637c286fadbf] Error 1
time: package/feeds/packages/gst1-libav/compile#4.08#1.20#6.27