I am trying to compile it from source on Linux.

I immediately ran into an annoying issue, which is having the need to specify those directories manually. So I did, and the configure finished successfully when I ran:

  ./configure --prefix=/home/john/.local/pkg/pkgin-20210529 --with-dbdir=/usr/ --with-libarchive=/usr/ --with-libfetch=/home/john/Downloads/libfetch-2.33 --with-openssl=/usr/ --with-sqlite3=/usr/ --with-pkg-install=/home/john/.local/pkg/pkgsrc-2021Q1/sbin/ --with-machine-arch=x86_64

When I ran `make`, I ran into:

  actions.c: In function ‘verb_flag’:
  actions.c:53:3: error: implicit declaration of function ‘strlcat’; did you mean ‘strncat’? [-Werror=implicit-function-declaration]
     53 |   strlcat(pkgtools_flags, "v", 1);
        |   ^~~~~~~
        |   strncat

Which tells me that I could fix it by providing `-I/usr/include/bsd/` and `-lbsd` or the like. I will give it a go. Any ideas anyway?

Edit: I added the above, and it went on to:

  In function ‘strncpy’,
      inlined from ‘read_repos’ at fsops.c:133:6:
  /usr/include/x86_64-linux-gnu/bits/string_fortified.h:106:10: error: ‘__builtin_strncpy’ specified bound 8192 equals destination size [-Werror=stringop-truncation]
    106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
        |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This does not sound too good, you probably want to fix it (along with the other warnings on Linux). In any case, I got rid of `-Werror` and I have a couple of undefined references. I will most likely get it to work, but you see my issue here, right? Is it the "official" way to compile it from source by the way?

Edit #2: I got a working binary by making those changes[1]. Last few lines:

   CCLD     pkgin
  /usr/bin/ld: external/pkgin-var.o: in function `var_get':
  /tmp/pkgin/external/var.c:99: warning: This function cannot be safely ported, use getline(3) instead, as it is supported by GNU and POSIX.1-2008.
  make[1]: Leaving directory '/tmp/pkgin'

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You might want to look into compiling it on Linux, because without those changes[1], you cannot do it. I was using commit e963d1e1a2409ed51d191d936b5f75e35bdf9197, version 20.12.1.

[1] You also have to include `<bsd/string.h>` for `strlcpy` on Linux. Only `actions.c` is affected.

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If you want, I am willing to send you an e-mail with the diff, but I will fix the other warnings, too, then. Oh, and instead of relying on `libbsd`, one could just add `strlcpy` and the like themselves.

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By the way, from where do I get the `repositories.conf` exactly? The supplied `repositories.conf` seems outdated. I tried using both `ftp://ftp.netbsd.org/pub/pkgsrc/packages/NetBSD/$arch/5.1/All` and `http://mirror-master.dragonflybsd.org/packages/$arch/DragonF...`, but they were not working.

Hmm, I tried to use a working one, but I got this:

  processing remote summary (https://pkgsrc.joyent.com/packages/Linux/el7/trunk/x86_64/All)...
  SSL support disabled
  SSL support disabled
  SSL support disabled
  pkgin: Could not fetch https://pkgsrc.joyent.com/packages/Linux/el7/trunk/x86_64/All/pkg_summary.gz

I am currently using `file://` that points to the manually downloaded `pkg_summary.gz`. Not sure why SSL support is disabled when I configured it, it specifically asked for it, and I provided it through `--with-openssl=/usr/` and it passed because it found it.