LHAPDF configure error - 2020.01.02

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在Ubuntu18上安装LHAPDF6.2.3时遇到配置错误，尝试解决LHAPDF安装问题，包括配置错误和Cython问题。尽管gcc和g++已安装，但C++编译器无法创建可执行文件。

LHAPDF configuration error - 2020.01.02

1. What I was doing on this bloody night
- 1.1 Before I run into this error
- 1.2 Cython Problem
2. What I vainly tried
- 2.1 for configuration error
- 2.2 for Cython shit

Nah nah nah nah…
I don’t want to finish this blog anymore, cuz the problem is way beyond my skill set so far. Once I overcome it, I’ll revisit this blog then and post about what I do.
Thanks

1. What I was doing on this bloody night

Who knows!

OS = Ubuntu 18
gcc = 5.5.0
g++ = 5.5.0
LHAPDF = 6.2.3/6.2.1/6.1.6/6.1.5

1.1 Before I run into this error

别人都告诉我LHAPDF是比较容易装的，我记得我之前装LHAPDF的时候也不觉得难，直到我遇到了今天这台机器。

LHAPDF-6.2.3

最开始的时候是LHAPDF-6.2.3的安装遇到了问题。老老实实按照LHAPDF installation instructions一步一步来，configure、make、make install都没有遇到什么大问题，但是在调用lhapdf的时候很明显可以看出来LHAPDF没有安装对。

lhapdf install CT14lo
Traceback (most recent call last):
  File "/usr/local/bin/lhapdf", line 442, in <module>
    for pdf in get_installed_list(options.PDFDIR):
  File "/usr/local/bin/lhapdf", line 237, in get_installed_list
    import lhapdf
ImportError: libLHAPDF.so: cannot open shared object file: No such file or directory

lhapdf list也会给出同样的错误，说明LHAPDF出了问题。然而lhapdf -h则可以给出LHAPDF的帮助文档，说明LHAPDF只是没有安好，而不是没有安装上。尝试良久，但找不到破解的方法。
一直关照我的小老师提醒了一下，LHAPDF installation instructions上说可以立c++的flag“-std=c++11”。但尝试后就会发现，./configure时并没有-std这个选项，进而改为

./configure CPPFLAGS=c++11 --prefix=/path/for/installation

但结果会变得更加恐怖

$ ./configure CPPFLAGS=c++11 --prefix=/usr/local
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether make supports nested variables... (cached) yes
checking for sw_vers... no
checking for g++... g++
checking whether the C++ compiler works... no
configure: error: in `/media/ms/Research/PDFit/LHAPDF/LHAPDF-6.2.1':
configure: error: C++ compiler cannot create executables
See `config.log' for more details

最令人挠头的是我明明安装了gcc和g++，但终端却告诉我C++ compiler没在工作。至此，并不知道该怎么办。