diff --git a/configure.ac b/configure.ac
index e5c57d14..2f4cf848 100644
--- a/configure.ac
+++ b/configure.ac
@@ -48,12 +48,12 @@ else
     AC_MSG_ERROR([`$NIX_STORE_PROGRAM' doesn't support `--timeout'; please use a newer version.])
 fi
 
-PKG_CHECK_MODULES([NIX], [nix-main nix-expr nix-store])
+PKG_CHECK_MODULES([NIX], [lix-main lix-expr lix-store])
 
 testPath="$(dirname $(type -p expr))"
 AC_SUBST(testPath)
 
-CXXFLAGS+=" -include nix/config.h"
+CXXFLAGS+=" -include lix/config.h -std=gnu++20"
 
 AC_CONFIG_FILES([
   Makefile
diff --git a/flake.lock b/flake.lock
index e57e97dd..5f975b8e 100644
--- a/flake.lock
+++ b/flake.lock
@@ -26,16 +26,15 @@
         "pre-commit-hooks": "pre-commit-hooks"
       },
       "locked": {
-        "lastModified": 1714955862,
-        "narHash": "sha256-REWlo2RYHfJkxnmZTEJu3Cd/2VM+wjjpPy7Xi4BdDTQ=",
-        "ref": "refs/tags/2.90-beta.1",
-        "rev": "b6799ab0374a8e1907a48915d3187e07da41d88c",
-        "revCount": 15501,
+        "lastModified": 1716890497,
+        "narHash": "sha256-NH7keFO8/FpGZp5OLmmP5wPGRYZ+MtWfdZNa1HPmqUA=",
+        "ref": "refs/heads/main",
+        "rev": "71b32bb87cd48dbbd672c8ca6b041ed36f3bae11",
+        "revCount": 15662,
         "type": "git",
         "url": "https://git@git.lix.systems/lix-project/lix"
       },
       "original": {
-        "ref": "refs/tags/2.90-beta.1",
         "type": "git",
         "url": "https://git@git.lix.systems/lix-project/lix"
       }
diff --git a/flake.nix b/flake.nix
index a4bc8ec2..7252a96d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,7 +2,7 @@
   description = "A Nix-based continuous build system";
 
   inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
-  inputs.nix.url = "git+https://git@git.lix.systems/lix-project/lix?ref=refs/tags/2.90-beta.1";
+  inputs.nix.url = "git+https://git@git.lix.systems/lix-project/lix";
   inputs.nix.inputs.nixpkgs.follows = "nixpkgs";
 
   outputs = { self, nixpkgs, nix }:
diff --git a/src/hydra-eval-jobs/Makefile.am b/src/hydra-eval-jobs/Makefile.am
index 90742a30..d5f99eed 100644
--- a/src/hydra-eval-jobs/Makefile.am
+++ b/src/hydra-eval-jobs/Makefile.am
@@ -1,5 +1,5 @@
 bin_PROGRAMS = hydra-eval-jobs
 
 hydra_eval_jobs_SOURCES = hydra-eval-jobs.cc
-hydra_eval_jobs_LDADD = $(NIX_LIBS) -lnixcmd
+hydra_eval_jobs_LDADD = $(NIX_LIBS) -llixcmd
 hydra_eval_jobs_CXXFLAGS = $(NIX_CFLAGS) -I ../libhydra
diff --git a/src/hydra-eval-jobs/hydra-eval-jobs.cc b/src/hydra-eval-jobs/hydra-eval-jobs.cc
index 0246efd5..3505af00 100644
--- a/src/hydra-eval-jobs/hydra-eval-jobs.cc
+++ b/src/hydra-eval-jobs/hydra-eval-jobs.cc
@@ -12,7 +12,7 @@
 #include "util.hh"
 #include "get-drvs.hh"
 #include "globals.hh"
-#include "common-eval-args.hh"
+#include "lix/libcmd/common-eval-args.hh"
 #include "flake/flakeref.hh"
 #include "flake/flake.hh"
 #include "attr-path.hh"