[root@klandestin /usr/ports/sysutils/nix]# MAKE_JOBS_UNSAFE=yes make
===>  License LGPL21 accepted by the user
===>   nix-2.3.10_1 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by nix-2.3.10_1 for building
===>  Extracting for nix-2.3.10_1
=> SHA256 Checksum OK for NixOS-nix-2.3.10_GH0.tar.gz.
=> SHA256 Checksum OK for 7c112351d9e941567e64063638396259546d9a48.patch.
===>  Patching for nix-2.3.10_1
===>  Applying distribution patches for nix-2.3.10_1
===>  Applying FreeBSD patches for nix-2.3.10_1 from /usr/ports/sysutils/n
===>   nix-2.3.10_1 depends on file: /usr/local/share/aclocal/ax_cxx_compi
===>   nix-2.3.10_1 depends on executable: bash - found
===>   nix-2.3.10_1 depends on package: docbook-xsl-ns>=0 - found
===>   nix-2.3.10_1 depends on executable: gnustat - found
===>   nix-2.3.10_1 depends on executable: grealpath - found
===>   nix-2.3.10_1 depends on executable: xmllint - found
===>   nix-2.3.10_1 depends on executable: xsltproc - found
===>   nix-2.3.10_1 depends on executable: bison - found
===>   nix-2.3.10_1 depends on package: gmake>=4.3 - found
===>   nix-2.3.10_1 depends on package: pkgconf>=1.3.0_1 - found
===>   nix-2.3.10_1 depends on package: autoconf>=2.69 - found
===>   nix-2.3.10_1 depends on package: automake>=1.16.1 - found
===>   nix-2.3.10_1 depends on shared library: libaws-cpp-sdk-core.so - fo
===>   nix-2.3.10_1 depends on shared library: libboost_context.so - found
===>   nix-2.3.10_1 depends on shared library: libbrotlienc.so - found (/u
===>   nix-2.3.10_1 depends on shared library: libcurl.so - found (/usr/lo
===>   nix-2.3.10_1 depends on shared library: libeditline.so - found (/us
===>   nix-2.3.10_1 depends on shared library: libgc.so - found (/usr/loca
===>   nix-2.3.10_1 depends on shared library: libsodium.so - found (/usr/
===>   nix-2.3.10_1 depends on shared library: libsqlite3.so - found (/usr
===>  Configuring for nix-2.3.10_1