diff --git a/.gitignore b/.gitignore
index efd22c8..a774788 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,2 @@
-src/genkey
-src/*.so
-src/recipient_sk.*
-src/recipient_pk.*
-src/*.c~
+/build
+
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f005f67..edd8119 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -5,14 +5,17 @@ stages:
 .build:
     stage: build
     before_script:
-        - apt-get update && apt-get install -y build-essential exim4-dev libsodium-dev
+        - apt-get update
+        - DEBIAN_FRONTEND=noninteractive DEBIAN_PRIORITY=critical apt-get install -y build-essential exim4-dev libsodium-dev meson exim4-daemon-heavy pkg-config openssl
     script:
-        - cd src
-        - make all
+        - meson build
+        - cd build
+        - ninja
+        - ninja test
     artifacts:
         paths:
-            - src/genkey
-            - src/libexim-encrypt-dlfunc.so
+            - build/src/genkey
+            - build/src/libexim-encrypt-dlfunc.so
 
 build:buster:
     extends:
@@ -33,34 +36,3 @@ build:focal:
     image: ubuntu:focal
     extends:
         - .build
-.test:
-    stage: test
-    before_script:
-        - apt-get update && apt-get install -y exim4-daemon-heavy openssl libsodium23
-    script:
-        - cd src
-        - ./simple_exim_test.sh
-
-test:buster:
-    extends:
-        - .test
-    needs: ["build:buster"]
-    image: debian:buster
-
-test:bullseye:
-    extends:
-        - .test
-    needs: ["build:bullseye"]
-    image: debian:bullseye
-
-test:bionic:
-    extends:
-        - .test
-    needs: ["build:bionic"]
-    image: ubuntu:bionic
-
-test:focal:
-    extends:
-        - .test
-    needs: ["build:focal"]
-    image: ubuntu:focal
diff --git a/meson.build b/meson.build
new file mode 100644
index 0000000..8533b9b
--- /dev/null
+++ b/meson.build
@@ -0,0 +1,23 @@
+project('libexim-encrypt-dlfunc', 'c',
+				  default_options: ['b_lundef=false', 'b_pie=true'])
+
+compiler = meson.get_compiler('c')
+conf_data = configuration_data()
+
+sodium_deps = dependency('libsodium')
+
+exim4_code = '''
+#include <stdio.h>
+#include <exim4/local_scan.h>
+int main() {
+    printf("%d\n", LOCAL_SCAN_ABI_VERSION_MAJOR);
+    return 0;
+}
+'''
+
+result = compiler.run(exim4_code)
+local_scan_version = result.stdout().strip().to_int()
+
+conf_data.set('local_scan_version', local_scan_version)
+
+subdir('src')
diff --git a/src/config.h.in b/src/config.h.in
new file mode 100644
index 0000000..d094bc8
--- /dev/null
+++ b/src/config.h.in
@@ -0,0 +1,4 @@
+#pragma once
+
+#define LOCAL_SCAN_VERSION @local_scan_version@
+
diff --git a/src/libexim-encrypt-dlfunc.c b/src/libexim-encrypt-dlfunc.c
index ed2d865..b8329f2 100644
--- a/src/libexim-encrypt-dlfunc.c
+++ b/src/libexim-encrypt-dlfunc.c
@@ -1,3 +1,5 @@
+#include "config.h"
+
 #include <stdlib.h>
 #include <string.h>
 #include <strings.h>
@@ -6,8 +8,10 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#define LOCAL_SCAN
+#define DLFUNC_IMPL
 /* Exim4 dlfunc API header */
-#include <local_scan.h>
+#include <exim4/local_scan.h>
 
 /*
  * This is a set of workarounds for the different exim local_scan ABI versions, distribution patches and missing
@@ -21,26 +25,14 @@
  * 3.1  Ubuntu 20-04 (Focal)
  */
 
-// local_scan ABI version < 3
-#if LOCAL_SCAN_ABI_VERSION_MAJOR < 3
-#define LOCAL_SCAN
-#define store_get_untainted(size) store_get(size)
-#define store_get_tainted(size) store_get(size)
-
-// local_scan ABI version == 3
-#elif LOCAL_SCAN_ABI_VERSION_MAJOR == 3
-#define DLFUNC_IMPL
-#define store_get_untainted(size) store_get(size, FALSE)
-#define store_get_tainted(size) store_get(size, TRUE)
-
-# define string_copy(s) string_copy_function(s)
-extern uschar * string_copy_function(const uschar *);
-
-// local_scan ABI version > 3
+#if LOCAL_SCAN_VERSION < 3
+#define store_get_untainted(size) (store_get(size))
+#define store_get_tainted(size) (store_get(size))
+#elif LOCAL_SCAN_VERSION >= 3
+#define store_get_untainted(size) (store_get(size, FALSE))
+#define store_get_tainted(size) (store_get(size, TRUE))
 #else
-#define DLFUNC_IMPL
-#define store_get_untainted(size) store_get(size, FALSE)
-#define store_get_tainted(size) store_get(size, TRUE)
+#error "exim4 local version"
 #endif
 
 /*
@@ -329,4 +321,4 @@ int sodium_crypto_box_seal_open(uschar **yield, int argc, uschar *argv[]) {
     // return cleartext
     *yield = string_copy(cleartext);
     return OK;
-}
\ No newline at end of file
+}
diff --git a/src/meson.build b/src/meson.build
new file mode 100644
index 0000000..37f4753
--- /dev/null
+++ b/src/meson.build
@@ -0,0 +1,14 @@
+configure_file(input: 'config.h.in',
+		      output: 'config.h',
+		      configuration: conf_data)
+
+executable('genkey', 'genkey.c', dependencies : [ sodium_deps ] )
+
+shared_library('exim-encrypt-dlfunc', 'libexim-encrypt-dlfunc.c',
+				      dependencies : [ sodium_deps ],
+				      install: true)		      
+
+
+simple_exim_test = find_program('simple_exim_test.sh')
+test('simple test', simple_exim_test)
+
diff --git a/src/simple_exim_test.sh b/src/simple_exim_test.sh
index c65a4c3..cf5acff 100755
--- a/src/simple_exim_test.sh
+++ b/src/simple_exim_test.sh
@@ -2,8 +2,10 @@
 
 set -e
 
+PATH=/sbin:/usr/sbin:$PATH
+
 # copy to /tmp to keep call to exim under 256 chars (prevent problems on Ubuntu)
-install -t /tmp libexim-encrypt-dlfunc.so
+install -t /tmp src/libexim-encrypt-dlfunc.so
 
 LIB=/tmp/libexim-encrypt-dlfunc.so
 CLEARTEXT="127.88.99.23" # keep short; see above