debianを使う。 pythonでmysqlを使うのに必要というので、
$ sudo apt-get install libmysqlclient-dev Reading package lists... Done Building dependency tree Reading state information... Done Package libmysqlclient-dev is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'libmysqlclient-dev' has no installation candidate
無い。普通にぐぐるとあるはずという。
sudo apt-get install default-libmysqlclient-dev
で入れることができた。