• Debian 9.5
  • Apache HTTP Server 2.4.34 (httpd)

After installing Apache from the official page with sudo make install, I want to check that the installation works starting the server:

$ sudo /usr/local/apache2/bin/apachectl -k start

But I get an error

/usr/local/apache2/bin/httpd: symbol lookup error: /usr/local/apache2/bin/httpd: undefined symbol: apr_crypto_init

Is the error related to the subject of libraries? What could it be?

The configuration that I made during the installation was:

$ sh configure --prefix /usr/local/apache2

If you need to attach screens, logs or installed libraries update the post to have more details.


I rebuilt httpd with a prefix of /usr/local

$ sh configure --prefix /usr/local
$ sudo make install
$ sudo /usr/local/bin/apachectl -k start

I recommend returning to the initial state of the virtual machine, so there are no residual libraries and files.

  • 1
    Is there a particular reason you didn't user the packaged version of apache via apt? – slm Jul 23 '18 at 10:56
  • I was following a tutorial (subdomain for jira software) which redirected me to a new page with the Apache documentation, and from that page I accessed the download. I did not know I could do it via apt. How should I do it? – Braian Coronel Jul 23 '18 at 11:42
  • 1
    I believe you can do an apt-get install apache2 to get this installed in Debian. There are many tutorials for this. I'm not versed in Debian but this looks promising - linode.com/docs/web-servers/apache/apache-web-server-debian-8. – slm Jul 23 '18 at 11:44
  • 1
    It looks like you have already verified that it does not work. – ctrl-alt-delor Jul 23 '18 at 12:09
  • Some things to consider: install with apt-get (already mentioned), use stow to combine self-builds into /usr/local, use docker, to have a self contained server (May be a newer version, can be from any distro, can be self-built). – ctrl-alt-delor Jul 23 '18 at 12:15

Yes, the error (probably) relates to libraries. I suspect that since you gave configure a prefix of /usr/local/apache2, the libraries built for httpd ended up in /usr/local/apache2/lib, which the dynamic linker doesn’t know about.

There are a number of ways to fix this:

  • Use the package instead, it will make your life easier in the long run:

    sudo apt install apache2


  • Add /usr/local/apache2/lib to the dynamic linker’s configuration; create a file, /etc/ld.so.conf.d/apache2-local.conf, containing the single line


    and run sudo ldconfig.


  • Rebuild httpd with a prefix of /usr/local, so that its binaries end up in /usr/local/bin and its libraries in /usr/local/lib.

(By the way, you don’t need to run configure as root, and you shouldn’t — configure and build as a plain user, and only install as root.)

| improve this answer | |
  • The 3rd option works – Braian Coronel Jul 24 '18 at 6:26
  • What is the difference between using PREFIX = /usr/local or resolving this with a dynamic linker's configuration? – Braian Coronel Jul 24 '18 at 7:08
  • Setting the prefix to /usr/local means that the libraries end up installed in a directory the linker already knows about, so it doesn’t need any configuration. Setting it to /usr/local/apache2 means that the libraries end up in a directory the linker doesn’t know about, so it needs to be told about it before it can use it. – Stephen Kitt Jul 24 '18 at 13:24

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