我尝试在我的覆盆子pi中构建crosstool，我遵循的程序来自How to compile FFmpeg for Raspberry Pi (Raspbian)。当我完成ct-ng build（花费很长时间）时，发生了错误。它显示Build failed in step 'Retrieving needed toolchain components' tarballs called in step '{top-level}'
以下是我从build.log中复制的错误。
[ERROR]
[ERROR] >>
[ERROR] >> Build failed in step 'Retrieving needed toolchain components' tarballs'
[ERROR] >> called in step '(top-level)'
[ERROR] >>
[ERROR] >> Error happened in: do_kernel_get[scripts/build/kernel/linux.sh@735]
[ERROR] >> called from: main[scripts/crosstool-NG.sh@576]
[ERROR] >>
[ERROR] >> For more info on this error, look at the file: 'build.log'
[ERROR] >> There is a list of known issues, some with workarounds, in:
[ERROR] >> '/opt/cross/share/doc/crosstool-ng/ct-ng.1.19.0/B - Known issues.txt'
[ERROR]
我该如何解决这个问题？请帮助我，我已经浪费了2天的时间。