Ubuntu 20.04 安装 OpenFOAM-v1712
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安装老版本的gcc
首先，需要安装老版本的g++/gcc:
sudo gedit /etc/apt/sources.list添加下面两行：
deb http://mirrors.aliyun.com/ubuntu/ xenial main deb http://mirrors.aliyun.com/ubuntu/ xenial universe然后：
sudo apt-get update sudo apt-get install g++-5 gcc-5 sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-5 100 sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-5 100现在，就应该默认选择gcc-5，g++-5了。接着，顺着编译OpenFOAM-v1712就好。
新版ubuntu适配
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32则需要运行：
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 40976EAF437D05B5 sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3B4FE6ACC0B21F32上方代码是后面的两个key
查看已有的版本：
ls /usr/bin/gcc* ls /usr/bin/g++*选择版本：
sudo update-alternatives --config gcc安装老版本的gfortran
输入
sudo gedit /etc/apt/sources.list添加下面两行：
deb http://mirrors.aliyun.com/ubuntu/ trusty main deb-src http://mirrors.aliyun.com/ubuntu/ trusty universe然后：
sudo apt-get update sudo apt-get install gfortran-4.7 libgfortran-4.7-dev sudo update-alternatives --install /usr/bin/gfortran gfortran /usr/bin/gfortran-4.7 100 -
李老师您好，
我按照您的提示：sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-5 100目前默认gcc-5
gcc (Ubuntu 5.3.1-14ubuntu2) 5.3.1 20160413 Copyright (C) 2015 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.我想切换回g9，用命令
sudo update-alternatives --config gcc得到：
There is only one alternative in link group gcc (providing /usr/bin/gcc): /usr/bin/gcc-5 Nothing to configure.没有切换提示，咋办？
我用命令
ls /usr/bin/gcc*/usr/bin/gcc /usr/bin/gcc-ar /usr/bin/gcc-nm /usr/bin/gcc-ranlib /usr/bin/gcc-5 /usr/bin/gcc-ar-5 /usr/bin/gcc-nm-5 /usr/bin/gcc-ranlib-5 /usr/bin/gcc-9 /usr/bin/gcc-ar-9 /usr/bin/gcc-nm-9 /usr/bin/gcc-ranlib-9应该是g9也在的，不知道为啥不能切换，跟百度不一样
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@chengan-wang 我有时候也遇到过这个问题 来回操作几次就解决了 目前不知道原因 不过还可以不算麻烦
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@chengan-wang 2.4版本需要安装gcc/g++-4.8 你试试
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@李东岳 李老师，我安装官网的方法https://openfoam.org/download/2-4-0-source/，还是不行呀，编译出错。又参考了http://openfoamwiki.net/index.php/Installation/Linux/OpenFOAM-2.4.0/Ubuntu#Ubuntu_18.04，ubuntu18.04的安装方法，也不行。
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@chengan-wang 你用的低版本g++么，我装的更低版本的openfoam-2.1都没问题呢
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@李东岳 李老师好，我分别用了gcc-4.7、g++-4.7；gcc-4.8、g++-4.8；gcc-5.0、g++-5.0在ubuntu20.04安装of2.4.0，按照官网和wiki都不行。您的安装流程能分享一下么？
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@chengan-wang log提示什么错误
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@李东岳 李老师，编译过程出现了很多错误：
== Generating build files == Configuring libCGAL -- Requested component: MPFR -- Requested component: GMP libCGAL is configured -- Sources for CGAL component library 'CGAL_Core/CMakeLists.txt' detected CMake Error at src/CMakeLists.txt:81 (add_subdirectory): add_subdirectory given source "/home/chengan/OpenFOAM/ThirdParty-2.4.0/CGAL-4.6/src/CGAL_Core/CMakeLists.txt" which is not an existing directory. Call Stack (most recent call first): src/CMakeLists.txt:140 (configure_component) -- Sources for CGAL component library 'CGAL_ImageIO/CMakeLists.txt' detected CMake Error at src/CMakeLists.txt:81 (add_subdirectory): add_subdirectory given source "/home/chengan/OpenFOAM/ThirdParty-2.4.0/CGAL-4.6/src/CGAL_ImageIO/CMakeLists.txt" which is not an existing directory. Call Stack (most recent call first): src/CMakeLists.txt:140 (configure_component) -- Sources for CGAL component library 'CGAL_Qt3/CMakeLists.txt' detected CMake Error at src/CMakeLists.txt:81 (add_subdirectory): add_subdirectory given source "/home/chengan/OpenFOAM/ThirdParty-2.4.0/CGAL-4.6/src/CGAL_Qt3/CMakeLists.txt" which is not an existing directory. Call Stack (most recent call first): src/CMakeLists.txt:140 (configure_component) -- Sources for CGAL component library 'CGAL_Qt4/CMakeLists.txt' detected CMake Error at src/CMakeLists.txt:81 (add_subdirectory): add_subdirectory given source "/home/chengan/OpenFOAM/ThirdParty-2.4.0/CGAL-4.6/src/CGAL_Qt4/CMakeLists.txt" which is not an existing directory. Call Stack (most recent call first): src/CMakeLists.txt:140 (configure_component) -- Sources for CGAL component libraries 'CGAL_Core/CMakeLists.txt;CGAL_ImageIO/CMakeLists.txt;CGAL_Qt3/CMakeLists.txt;CGAL_Qt4/CMakeLists.txt' detected == Generating build files (DONE) == -- Configuring incomplete, errors occurred! See also "/home/chengan/OpenFOAM/ThirdParty-2.4.0/build/linux64Gcc/CGAL-4.6/CMakeFiles/CMakeOutput.log". See also "/home/chengan/OpenFOAM/ThirdParty-2.4.0/build/linux64Gcc/CGAL-4.6/CMakeFiles/CMakeError.log". + exit 1还有很多这样的：
/usr/bin/ld: /home/chengan/OpenFOAM/OpenFOAM-2.4.0/platforms/linux64GccDPOpt/lib/libtriSurface.so: undefined reference to `yyFlexLexer::yywrap()' collect2: error: ld returned 1 exit status make[2]: *** [/home/chengan/OpenFOAM/OpenFOAM-2.4.0/wmake/Makefile:150: /home/chengan/OpenFOAM/OpenFOAM-2.4.0/platforms/linux64GccDPOpt/bin/interMixingFoam] Error 1 make[1]: *** [/home/chengan/OpenFOAM/OpenFOAM-2.4.0/wmake/MakefileApps:39: interFoam] Error 2 make[1]: Target 'application' not remade because of errors. make: *** [/home/chengan/OpenFOAM/OpenFOAM-2.4.0/wmake/MakefileApps:39: multiphase] Error 2 make: Target 'application' not remade because of errors.log文件如下：
log.tar.xz
希望李老师能百忙之中指点一下！ -
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@李东岳 谢谢李老师，不过命令报错了
chengan@chengan-MS-7C80:~/OpenFOAM/OpenFOAM-2.4.0$ find src applications -name "*.L" -type f | xargs sed -i -e 's=(YY_FLEX_SUBMINOR_VERSION)=YY_FLEX_MINOR_VERSION < 6 && \1=' sed: -e expression #1, char 61: invalid reference \1 on `s' command's RHS -
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@chengan-wang 没关系，主要是其中做foamQuad网格的，这个用得少
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@chengan-wang 为什么要用openfoam2.4.?
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李 李东岳 被引用 于这个主题
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李 李东岳 被引用 于这个主题
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@李东岳 李老师，我看了新版waves2foam的教程，参考这篇帖子的gfortran4安装。指令直接复制到终端，出现了报错：
可以请教一下这该怎么解决吗？
，还是可以将就着用？