如题：

scripts/extract-cert.c:21:25: fatal error: openssl/bio.h: No such file or directory
compilation terminated.
scripts/Makefile.host:90: recipe for target 'scripts/extract-cert' failed
make[1]: *** [scripts/extract-cert] Error 1
Makefile:556: recipe for target 'scripts' failed
make: *** [scripts] Error 2

安装openssl：

ubuntu16.04机器：

sudo apt install libssl-dev