Linux Device Driver
解決"scripts/mod/modpost: not found"問題
參考資訊：
1. no-build-scripts-available-when-compiling-module-outside-of-linux-source-tree
問題：
WARNING: Symbol version dump "Module.symvers" is missing.
Modules may not have dependencies or modversions.
MODPOST samples/bpf/Module.symvers
/bin/sh: 1: scripts/mod/modpost: not found
make[1]: *** [scripts/Makefile.modpost:124: samples/bpf/Module.symvers] Error 127
make: *** [Makefile:1759: modules] Error 2
解法：
$ make modules_prepare