diff --git a/README.md b/README.md
index 0aa8800..c6027f3 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ Main repo: https://git.sudoer.ch/me/really-bad-compiler-in-haskell
 
 - Language: Haskell
 - Haskell tools: GHCup, Stack, Cabal
-- Libraries: megaparsec, parser-combinators, text
+- Libraries: megaparsec, parser-combinators, text, llvm-hs-pure
 - IDE: VSCodium
 - Git platform: Forgejo
 - AI: Phind
diff --git a/package.yaml b/package.yaml
index 32ff1aa..b402393 100644
--- a/package.yaml
+++ b/package.yaml
@@ -1,17 +1,27 @@
 name: really-bad-compiler-in-haskell
 version: 0
 author: sudoer777
-maintainer: git@sudoer.ch
 dependencies:
-  - base
-  - megaparsec
+  - base >= 4.16.4 && < 5
+  - megaparsec >= 9.2.2 && < 10
   - parser-combinators
   - text
+  - llvm-hs-pure >= 15 && < 16
+  # - llvm-hs-pretty >= 0.9 && < 1
 tested-with: GHC == 9.2.8
+category: Compilers/Interpreters
 
-ghc-options: -threaded -Wall -j +RTS -A32M -RTS
+ghc-options: -threaded -Wall -j8 +RTS -A64M -RTS
 
-executables:
-  compiler:
-    source-dirs: app
-    main: Main.hs
+# library:
+#   source-dirs: src
+
+executable:
+  source-dirs: app
+  main: Main.hs
+# tests:
+#   testall:
+#     main: Testall.hs
+#     source-dirs: test
+
+# default-extensions: OverloadedStrings, LambdaCase
diff --git a/really-bad-compiler-in-haskell.cabal b/really-bad-compiler-in-haskell.cabal
index c00d58f..eeb4c2a 100644
--- a/really-bad-compiler-in-haskell.cabal
+++ b/really-bad-compiler-in-haskell.cabal
@@ -6,13 +6,14 @@ cabal-version: 1.12
 
 name:           really-bad-compiler-in-haskell
 version:        0
+category:       Compilers/Interpreters
 author:         sudoer777
-maintainer:     git@sudoer.ch
+maintainer:     sudoer777
 build-type:     Simple
 tested-with:
     GHC == 9.2.8
 
-executable compiler
+executable really-bad-compiler-in-haskell
   main-is: Main.hs
   other-modules:
       Eval.Expression
@@ -21,10 +22,11 @@ executable compiler
       Paths_really_bad_compiler_in_haskell
   hs-source-dirs:
       app
-  ghc-options: -threaded -Wall -j +RTS -A32M -RTS
+  ghc-options: -threaded -Wall -j8 +RTS -A64M -RTS
   build-depends:
-      base
-    , megaparsec
+      base >=4.16.4 && <5
+    , llvm-hs-pure ==15.*
+    , megaparsec >=9.2.2 && <10
     , parser-combinators
     , text
   default-language: Haskell2010
diff --git a/stack.yaml b/stack.yaml
index 4be007a..9d3fff2 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,67 +1,10 @@
-# This file was automatically generated by 'stack init'
-#
-# Some commonly used options have been documented as comments in this file.
-# For advanced use and comprehensive documentation of the format, please see:
-# https://docs.haskellstack.org/en/stable/yaml_configuration/
+resolver: lts-20.26
 
-# Resolver to choose a 'specific' stackage snapshot or a compiler version.
-# A snapshot resolver dictates the compiler version and the set of packages
-# to be used for project dependencies. For example:
-#
-# resolver: lts-3.5
-# resolver: nightly-2015-09-21
-# resolver: ghc-7.10.2
-#
-# The location of a snapshot can be provided as a file or url. Stack assumes
-# a snapshot provided as a file might change, whereas a url resource does not.
-#
-# resolver: ./custom-snapshot.yaml
-# resolver: https://example.com/snapshots/2018-01-01.yaml
-resolver:
-  url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/20/26.yaml
-
-# User packages to be built.
-# Various formats can be used as shown in the example below.
-#
-# packages:
-# - some-directory
-# - https://example.com/foo/bar/baz-0.0.2.tar.gz
-#   subdirs:
-#   - auto-update
-#   - wai
 packages:
   - .
-# Dependency packages to be pulled from upstream that are not in the resolver.
-# These entries can reference officially published versions as well as
-# forks / in-progress versions pinned to a git hash. For example:
-#
-# extra-deps:
-# - acme-missiles-0.3
-# - git: https://github.com/commercialhaskell/stack.git
-#   commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
-#
-# extra-deps: []
-
-# Override default flag values for local packages and extra-deps
-# flags: {}
-
-# Extra package databases containing global packages
-# extra-package-dbs: []
-
-# Control whether we use the GHC we find on the path
-# system-ghc: true
-#
-# Require a specific version of Stack, using version ranges
-# require-stack-version: -any # Default
-# require-stack-version: ">=2.9"
-#
-# Override the architecture used by Stack, especially useful on Windows
-# arch: i386
-# arch: x86_64
-#
-# Extra directories used by Stack for building
-# extra-include-dirs: [/path/to/dir]
-# extra-lib-dirs: [/path/to/dir]
-#
-# Allow a newer minor version of GHC than the snapshot specifies
-# compiler-check: newer-minor
+extra-deps:
+  # - llvm-hs-pretty-0.9.0.0
+  - github: llvm-hs/llvm-hs
+    commit: 5bca2c1a2a3aa98ecfb19181e7a5ebbf3e212b76
+    subdirs:
+      - llvm-hs-pure
diff --git a/stack.yaml.lock b/stack.yaml.lock
index eef24df..6b809c3 100644
--- a/stack.yaml.lock
+++ b/stack.yaml.lock
@@ -3,11 +3,23 @@
 # For more information, please see the documentation at:
 #   https://docs.haskellstack.org/en/stable/lock_files
 
-packages: []
+packages:
+- completed:
+    name: llvm-hs-pure
+    pantry-tree:
+      sha256: b512f9e5f8f2b3e3a06bad2fa5ff053a83d817798c7efcd47e254e68c842169d
+      size: 2712
+    sha256: 526b67e2da9ce25b3856c221b6772e699a7593dbb5ba38e7ee2436349de70966
+    size: 9802209
+    subdir: llvm-hs-pure
+    url: https://github.com/llvm-hs/llvm-hs/archive/5bca2c1a2a3aa98ecfb19181e7a5ebbf3e212b76.tar.gz
+    version: 15.0.0
+  original:
+    subdir: llvm-hs-pure
+    url: https://github.com/llvm-hs/llvm-hs/archive/5bca2c1a2a3aa98ecfb19181e7a5ebbf3e212b76.tar.gz
 snapshots:
 - completed:
     sha256: 5a59b2a405b3aba3c00188453be172b85893cab8ebc352b1ef58b0eae5d248a2
     size: 650475
     url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/20/26.yaml
-  original:
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/20/26.yaml
+  original: lts-20.26