diff --git a/dolphin/mat2.desktop b/dolphin/mat2.desktop
index e623962..5d69ae2 100644
--- a/dolphin/mat2.desktop
+++ b/dolphin/mat2.desktop
@@ -7,5 +7,5 @@ Type=Service
 [Desktop Action cleanMetadata]
 Name=Clean metadata
 Name[es]=Limpiar metadatos
-Icon=/usr/share/icons/hicolor/scalable/apps/mat2.svg
-Exec=kdialog --yesno  "$( mat2 -s %U )" --title "Clean Metadata?" && mat2 %U
+Icon=@mat2svg@
+Exec=@kdialog@ --yesno  "$( @mat2@ -s %U )" --title "Clean Metadata?" && @mat2@ %U
diff --git a/libmat2/bubblewrap.py b/libmat2/bubblewrap.py
index 970d5dd..5d3c0b7 100644
--- a/libmat2/bubblewrap.py
+++ b/libmat2/bubblewrap.py
@@ -22,11 +22,7 @@ CalledProcessError = subprocess.CalledProcessError
 
 
 def _get_bwrap_path() -> str:
-    which_path = shutil.which('bwrap')
-    if which_path:
-        return which_path
-
-    raise RuntimeError("Unable to find bwrap")  # pragma: no cover
+    return '@bwrap@'
 
 
 def _get_bwrap_args(tempdir: str,
@@ -37,16 +33,11 @@ def _get_bwrap_args(tempdir: str,
 
     # XXX: use --ro-bind-try once all supported platforms
     # have a bubblewrap recent enough to support it.
-    ro_bind_dirs = ['/usr', '/lib', '/lib64', '/bin', '/sbin', '/etc/alternatives', cwd]
+    ro_bind_dirs = ['/nix/store', cwd]
     for bind_dir in ro_bind_dirs:
         if os.path.isdir(bind_dir):  # pragma: no cover
             ro_bind_args.extend(['--ro-bind', bind_dir, bind_dir])
 
-    ro_bind_files = ['/etc/ld.so.cache']
-    for bind_file in ro_bind_files:
-        if os.path.isfile(bind_file):  # pragma: no cover
-            ro_bind_args.extend(['--ro-bind', bind_file, bind_file])
-
     args = ro_bind_args + \
         ['--dev', '/dev',
          '--proc', '/proc',
diff --git a/libmat2/exiftool.py b/libmat2/exiftool.py
index eb65b2a..51a0fa1 100644
--- a/libmat2/exiftool.py
+++ b/libmat2/exiftool.py
@@ -1,8 +1,6 @@
-import functools
 import json
 import logging
 import os
-import shutil
 import subprocess
 from typing import Dict, Union, Set
 
@@ -70,14 +68,5 @@ class ExiftoolParser(abstract.AbstractParser):
             return False
         return True
 
-@functools.lru_cache()
 def _get_exiftool_path() -> str:  # pragma: no cover
-    which_path = shutil.which('exiftool')
-    if which_path:
-        return which_path
-
-    # Exiftool on Arch Linux has a weird path
-    if os.access('/usr/bin/vendor_perl/exiftool', os.X_OK):
-        return '/usr/bin/vendor_perl/exiftool'
-
-    raise RuntimeError("Unable to find exiftool")
+    return '@exiftool@'
diff --git a/libmat2/parser_factory.py b/libmat2/parser_factory.py
index 9965432..bd45179 100644
--- a/libmat2/parser_factory.py
+++ b/libmat2/parser_factory.py
@@ -8,6 +8,7 @@ from . import abstract, UNSUPPORTED_EXTENSIONS
 
 T = TypeVar('T', bound='abstract.AbstractParser')
 
+mimetypes.init(['@mimetypes@'])
 mimetypes.add_type('application/epub+zip', '.epub')
 mimetypes.add_type('application/x-dtbncx+xml', '.ncx')  # EPUB Navigation Control XML File
 
diff --git a/libmat2/video.py b/libmat2/video.py
index b4a3232..3dd7ee5 100644
--- a/libmat2/video.py
+++ b/libmat2/video.py
@@ -1,6 +1,4 @@
 import subprocess
-import functools
-import shutil
 import logging
 
 from typing import Dict, Union
@@ -135,10 +133,5 @@ class MP4Parser(AbstractFFmpegParser):
     }
 
 
-@functools.lru_cache()
 def _get_ffmpeg_path() -> str:  # pragma: no cover
-    which_path = shutil.which('ffmpeg')
-    if which_path:
-        return which_path
-
-    raise RuntimeError("Unable to find ffmpeg")
+    return '@ffmpeg@'