Index: sysutils/nix/Makefile
===================================================================
--- /dev/null
+++ sysutils/nix/Makefile
@@ -0,0 +1,30 @@
+# $FreeBSD$
+
+PORTNAME=	nix
+DISTVERSION=    2.1.3
+CATEGORIES=	sysutils
+MASTER_SITES=	https://nixos.org/releases/nix/${PORTNAME}-${DISTVERSION}/
+
+MAINTAINER=     0mp@FreeBSD.org
+COMMENT=	Purely functional package manager
+
+LICENSE=        LGPL21
+LICENSE_FILE=	${WRKSRC}/COPYING
+
+# Might need xmllint:textproc/libxml2 and xsltproc:textproc/libxslt
+LIB_DEPDENDS=	libcurl:ftp/curl \
+		liblzma:archives/lzmalib \
+		libbrotlidec:archivers/brotli
+
+BUILD_DEPENDS=	bash:shells/bash
+
+# bzip2 seems to be required as well.
+USES=	autoreconf bison:build compiler:c++14-lang gmake pkgconfig ssl sqlite:3 tar:xz
+
+GNU_CONFIGURE=	yes
+CONFIGURE_ARGS=	--disable-seccomp-sandboxing OPENSSL_LIBS=${OPENSSLLIB}
+
+# Optional:
+# Boehm garbage collector
+
+.include <bsd.port.mk>
Index: sysutils/nix/distinfo
===================================================================
--- /dev/null
+++ sysutils/nix/distinfo
@@ -0,0 +1,3 @@
+TIMESTAMP = 1540927566
+SHA256 (nix-2.1.3.tar.xz) = 5d22dad058d5c800d65a115f919da22938c50dd6ba98c5e3a183172d149840a4
+SIZE (nix-2.1.3.tar.xz) = 816396
Index: sysutils/nix/files/patch-configure.ac
===================================================================
--- /dev/null
+++ sysutils/nix/files/patch-configure.ac
@@ -0,0 +1,29 @@
+--- configure.ac.orig	1970-01-01 00:00:01 UTC
++++ configure.ac
+@@ -147,7 +147,7 @@ AC_SUBST(storedir)
+ 
+ 
+ # Look for OpenSSL, a required dependency.
+-PKG_CHECK_MODULES([OPENSSL], [libcrypto], [CXXFLAGS="$OPENSSL_CFLAGS $CXXFLAGS"])
++AC_CHECK_HEADERS([openssl/ssl.h], [CXXFLAGS="$OPENSSL_CFLAGS $CXXFLAGS"])
+ 
+ 
+ # Look for libbz2, a required dependency.
+@@ -162,7 +162,7 @@ PKG_CHECK_MODULES([SQLITE3], [sqlite3 >= 3.6.19], [CXX
+ 
+ 
+ # Look for libcurl, a required dependency.
+-PKG_CHECK_MODULES([LIBCURL], [libcurl], [CXXFLAGS="$LIBCURL_CFLAGS $CXXFLAGS"])
++AC_CHECK_HEADERS([/usr/local/include/curl/curl.h], [CXXFLAGS="$LIBCURL_CFLAGS $CXXFLAGS"])
+ 
+ 
+ # Look for libsodium, an optional dependency.
+@@ -180,7 +180,7 @@ AC_CHECK_LIB([lzma], [lzma_stream_encoder_mt],
+ 
+ 
+ # Look for libbrotli{enc,dec}.
+-PKG_CHECK_MODULES([LIBBROTLI], [libbrotlienc libbrotlidec], [CXXFLAGS="$LIBBROTLI_CFLAGS $CXXFLAGS"])
++AC_CHECK_HEADERS([/usr/local/include/brotli/decode.h], [CXXFLAGS="$LIBBROTLI_CFLAGS $CXXFLAGS"])
+ 
+ 
+ # Look for libseccomp, required for Linux sandboxing.