black$ ./configure
Welcome to Notmuch, a system for indexing, searching and tagging your email.

We hope that the process of building and installing notmuch is quick
and smooth so that you can soon be reading and processing your email
more efficiently than ever.

If anything goes wrong in the configure process, you can override any
decisions it makes by manually editing the Makefile.config file that
it creates. Also please do as much as you can to figure out what could
be different on your machine compared to those of the notmuch
developers. Then, please email those details to the Notmuch list
(notmuch@notmuchmail.org) so that we can hopefully make future
versions of notmuch easier for you to use.

We'll now investigate your system to verify that all required
dependencies are available:

Sanity checking C compilation environment... OK.
Sanity checking C++ compilation environment... OK.
Reading libnotmuch version from source... OK.
Checking for Xapian development files... Yes (1.4.5).
Checking for Xapian compaction support... Yes.
Checking for Xapian FieldProcessor API... Yes.
Checking for Xapian lock retry support... Yes.
Testing default Xapian backend... glass
Checking for GMime development files... Yes.
Checking for GMime session key extraction support... ./configure[587]: cannot open ./test/gnupg-secret-key.asc: No such file or directory
No.
*** Error: Could not extract session keys from encrypted message.

This is likely due to your GMime having been built against a old
version of GPGME.

Please try to rebuild your version of GMime against a more recent
version of GPGME (at least GPGME 1.8.0).
Your current GPGME development version is: 1.13.1
Checking for Glib development files (>= 2.22)... Yes.
Checking for zlib (>= 1.2.5.2)... No.
Checking for talloc development files... Yes.
Checking for bash... Yes (/usr/local/bin/bash).
Checking for perl... Yes (/usr/bin/perl).
Checking for python... Yes (python3).
Checking for valgrind development files... Yes.
Checking for bash-completion (>= 1.90)... No (will not install bash completion).
Checking if emacs (>= 24) is available... No (disabling emacs related parts of build)
Checking if doxygen is available... Yes.
Checking for ruby development files... Yes.
Checking if sphinx is available and supports nroff output... No (so will not install man pages).
Checking if makeinfo is available... Yes.
Checking if install-info is available... Yes.
Checking if desktop-file-install is available... Yes.
Checking for cppcheck... Yes.
Checking which platform we are on... OpenBSD.

*** Error: The dependencies of notmuch could not be satisfied. You will
need to install the following packages before being able to compile
notmuch:

        zlib library (>= version 1.2.5.2, including development files such as headers)
        https://zlib.net/

With any luck, you're using a modern, package-based operating system
that has all of these packages available in the distribution. In that
case a simple command will install everything you need. For example:

On Debian and similar systems:

        sudo apt-get install libxapian-dev libgmime-3.0-dev libtalloc-dev zlib1g-dev

Or on Fedora and similar systems:

        sudo yum install xapian-core-devel gmime-devel libtalloc-devel zlib-devel

On other systems, similar commands can be used, but the details of the
package names may be different.

When you have installed the necessary dependencies, you can run
configure again to ensure the packages can be found, or simply run
"make" to compile notmuch.