Dear Ladies or Gentelman:

    My MCU can¡¯t connect to the ubuntu¡¯s apt-source(like Ubuntu,aliyun,163 etc). So It certainly can¡¯t use the command ¡°sudo apt-get install gcc" to make it all right.
    So I want to know how to install gcc in the way of offline in ubuntu18.04.
    I search the solution from the internet then find one:https://blog.csdn.net/weixin_40671425/article/details/92762839. But unfortunately, it worked wrong on the steps: " ./configure --disable-multilib --prefix=/data2/upchen/MyPackages/gcc/gcc-5.4.0 --enable-add-ons ". The result is as follows:
---------------------linux@test:~/gcc-5.4.0$ ./configure --disable-multilib --prefix=/data2/upchen/MyPackages/gcc/gcc-5.4.0 --enable-add-ons
checking build system type... x86_64-unknown-linux-gnu
checking host system type... x86_64-unknown-linux-gnu
checking target system type... x86_64-unknown-linux-gnu
checking for a BSD-compatible install... /usr/bin/install -c
checking whether ln works... yes
checking whether ln -s works... yes
checking for a sed that does not truncate output... /bin/sed
checking for gawk... gawk
checking for libatomic support... yes
checking for libcilkrts support... yes
checking for libitm support... yes
checking for libsanitizer support... yes
checking for libvtv support... yes
checking for gcc... no
checking for cc... no
checking for cl.exe... no
configure: error: in `/home/linux/gcc-5.4.0':
configure: error: no acceptable C compiler found in $PATH
See `config.log' for more details.
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the config.log is in attachment.
Thanks for the kind of selfless help in good faith.