Applying /immortalwrt/master/feeds/packages/libs/libcronet/patches/100-fix-histogram-types-for-python39.patch using plaintext: 
patching file src/tools/metrics/histograms/extract_histograms.py
/immortalwrt/master/build_dir/target-powerpc64_e5500_musl/libcronet-150.0.7871.63~72a06c9f/src /immortalwrt/master/feeds/packages/libs/libcronet
/immortalwrt/master/feeds/packages/libs/libcronet
/immortalwrt/master/build_dir/target-powerpc64_e5500_musl/libcronet-150.0.7871.63~72a06c9f/src /immortalwrt/master/feeds/packages/libs/libcronet
ERROR at //base/allocator/partition_allocator/partition_alloc.gni:98:3: Assertion failed.
  assert(false, "Unknown CPU: $current_cpu")
  ^-----
Unknown CPU: powerpc64
See //base/allocator/allocator.gni:5:1: whence it was imported.
import("//base/allocator/partition_allocator/partition_alloc.gni")
^----------------------------------------------------------------
See //base/BUILD.gn:20:1: whence it was imported.
import("//base/allocator/allocator.gni")
^--------------------------------------
See //net/BUILD.gn:139:5: which caused the file to be included.
    "//base",
    ^-------
/immortalwrt/master/feeds/packages/libs/libcronet
ninja: Entering directory `/immortalwrt/master/build_dir/target-powerpc64_e5500_musl/libcronet-150.0.7871.63~72a06c9f/src/out/Release'
ninja: error: loading 'build.ninja': No such file or directory
make[2]: *** [Makefile:131: /immortalwrt/master/build_dir/target-powerpc64_e5500_musl/libcronet-150.0.7871.63~72a06c9f/.built] Error 1
time: package/feeds/packages/libcronet/compile#5.87#2.13#8.57