[root@gaojingbo yum.repos.d]# wget https://gcc.gnu.org/gcc-7/ --2018-08-16 17:08:54-- https://gcc.gnu.org/gcc-7/ Resolving gcc.gnu.org (gcc.gnu.org)... 209.132.180.131 Connecting to gcc.gnu.org (gcc.gnu.org)|209.132.180.131|:443... connected. ERROR: cannot verify gcc.gnu.org's certificate, issued by ‘/C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3’: Unable to locally verify the issuer's authority. To connect to gcc.gnu.org insecurely, use `--no-check-certificate'. 錯誤：無法驗證Gcc.GNU.org的證書，由'/C= U/O＝=讓我們加密/CN=讓加密權限X3’： 無法在本地驗證發行者的權限。 為了安全地連接到GC.GNU.ORG，請使用“無檢查證書”。 此時使用以下命令即可 [root@gaojingbo yum.repos.d]# yum install -y ca-certificates