用C编译程序

Question

this is my first question here. I have been compiling a Debian package in C ( emacs ). It is also my first compilation, so I don't understand much about it (until now).

I have the following structure:

• A folder with all the files needed for the compilation (the result of extracting the tar.gz source code package) in /home/user/emacs .
• A folder in which I've installed the program by using make install in /opt/emacs (because I specified that path while doing the ./configure , in the --prefix argument).

As you all know, Linux uses a $PATH variable where all the paths that Linux should use to search for binaries are specified. By default, /opt/emacs/bin is obviusly not contemplated in that variable, and it is not an option for me to include it. The possible solution that I've heard about is to create a softlink in /usr/local/bin folder, which aims to that /opt/emacs/bin/* files.

Here comes my question. That /opt/emacs also has a lib/ subdirectory. Would it be needed to also create a softlink for those libraries in /usr/local/lib for emacs to correctly work, or with the binary softlink is enough?

Thank you so much.

Answer 1

Not sure if emacs only needs the binary symlink or the library directory as well. Try running it. If it needed the libraries and cannot find them, it will fall over rather quickly.

Let's assume that the libraries are needed. You have several options for installing them (choose at most one):

• copy or link libraries to a library directory that's known to the system (eg /usr/local/lib), run ldconfig afterwards. On second thoughts, don't do this one, it's the worst option.
• edit /etc/ld.so.conf to add the emacs library directory there, run ldconfig
• launch emacs through eg a shellscript that sets LD_LIBRARY_PATH to its lib directory and then runs it

For more in-depth details see https://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html