Applying /builder/shared-workdir/build/sdk/feeds/base_root/package/libs/libbpf/patches/100-bpf_tc_classid.patch using plaintext: 
patching file src/libbpf.h
patching file src/netlink.c
make[4]: Entering directory '/builder/shared-workdir/build/sdk/build_dir/target-arm_cortex-a5+vfpv4_musl_eabi/libbpf-1.5.0/src'
Package libelf was not found in the pkg-config search path.
Perhaps you should add the directory containing `libelf.pc'
to the PKG_CONFIG_PATH environment variable
Package 'libelf' not found
  MKDIR    staticobjs
  MKDIR    sharedobjs
  CC       staticobjs/bpf.o
In file included from bpf.c:37:
libbpf_internal.h:20:10: fatal error: libelf.h: No such file or directory
   20 | #include <libelf.h>
      |          ^~~~~~~~~~
compilation terminated.
make[4]: *** [Makefile:134: staticobjs/bpf.o] Error 1
make[4]: Leaving directory '/builder/shared-workdir/build/sdk/build_dir/target-arm_cortex-a5+vfpv4_musl_eabi/libbpf-1.5.0/src'
make[3]: *** [Makefile:75: /builder/shared-workdir/build/sdk/build_dir/target-arm_cortex-a5+vfpv4_musl_eabi/libbpf-1.5.0/.built] Error 2
time: package/feeds/base/libbpf/compile#0.86#0.18#4.55