diff --git a/kiwixbuild/dependencies/base.py b/kiwixbuild/dependencies/base.py
index bee1e9a..feb8d03 100644
--- a/kiwixbuild/dependencies/base.py
+++ b/kiwixbuild/dependencies/base.py
@@ -263,6 +263,12 @@ class Builder:
         self.command('configure', self._configure)
         self.command('make_dist', self._make_dist)
 
+    def set_flatpak_buildsystem(self, module):
+        if getattr(self, 'flatpak_buildsystem', None):
+            module['buildsystem'] = self.flatpak_buildsystem
+        if getattr(self, 'configure_option', ''):
+            module['config-opts'] = self.configure_option.split(' ')
+
 
 class NoopBuilder(Builder):
     def build(self):
@@ -283,6 +289,7 @@ class MakeBuilder(Builder):
     configure_env = None
     make_target = ""
     make_install_target = "install"
+    flatpak_buildsystem = None
 
     @property
     def all_configure_option(self):
@@ -337,6 +344,8 @@ class MakeBuilder(Builder):
 
 
 class CMakeBuilder(MakeBuilder):
+    flatpak_buildsystem = 'cmake'
+
     def _configure(self, context):
         context.try_skip(self.build_path)
         cross_option = ""
@@ -367,9 +376,14 @@ class CMakeBuilder(MakeBuilder):
             env.update(self.configure_env)
         run_command(command, self.build_path, context, env=env, buildEnv=self.buildEnv, cross_env_only=True)
 
+    def set_flatpak_buildsystem(self, module):
+        super().set_flatpak_buildsystem( module)
+        module['buildir'] = True
+
 
 class QMakeBuilder(MakeBuilder):
     qmake_target = ""
+    flatpak_buildsystem = 'qmake'
 
     @property
     def env_option(self):
@@ -416,6 +430,7 @@ class QMakeBuilder(MakeBuilder):
 class MesonBuilder(Builder):
     configure_option = ""
     test_option = ""
+    flatpak_buildsystem = 'meson'
 
     @property
     def library_type(self):
diff --git a/kiwixbuild/dependencies/mustache.py b/kiwixbuild/dependencies/mustache.py
index 625cb50..820e901 100644
--- a/kiwixbuild/dependencies/mustache.py
+++ b/kiwixbuild/dependencies/mustache.py
@@ -24,3 +24,6 @@ class Mustache(Dependency):
             copy2(pj(self.source_path, 'mustache.hpp'),
                   pj(self.buildEnv.install_dir, 'include'))
 
+        def set_flatpak_buildsystem(self, module):
+            module['buildsystem'] = 'simple'
+            module['build-commands'] = ['cp mustache.hpp /app/include']
diff --git a/kiwixbuild/flatpak_builder.py b/kiwixbuild/flatpak_builder.py
index 50bdba0..1fb2c0a 100644
--- a/kiwixbuild/flatpak_builder.py
+++ b/kiwixbuild/flatpak_builder.py
@@ -171,17 +171,8 @@ class FlatpakBuilder:
 
             else:
                 builder = get_target_step(stepDef)
-                if isinstance(builder, MesonBuilder):
-                    module['buildsystem'] = 'meson'
-                elif isinstance(builder, CMakeBuilder):
-                    module['buildsystem'] = 'cmake'
-                    module['builddir'] = True
-                elif isinstance(builder, QMakeBuilder):
-                    module['buildsystem'] = 'qmake'
-                # config-opts
+                builder.set_flatpak_buildsystem(module)
                 print(module['name'])
-                if getattr(builder, 'configure_option', ''):
-                    module['config-opts'] = builder.configure_option.split(' ')
 
         manifest = MANIFEST.copy()
         modules = [m for m in modules.values() if m.get('sources')]