diff --git a/PyTeX/build/build/builder.py b/PyTeX/build/build/builder.py
index 3a00315..4814a37 100644
--- a/PyTeX/build/build/builder.py
+++ b/PyTeX/build/build/builder.py
@@ -63,9 +63,26 @@ class PyTeXBuilder:
         )
         return version
 
-    @classmethod
-    def is_ignored_in_build_dir(cls, path: RelativePath):
-        return path.relative_path.name == VERSION_INFO_FILE
+    def _ignored_subfolders_in_build_dir(self) -> List[Path]:
+        if self._build_target_type == PyTeXRootDirType.BUILD:
+            dirs = [
+                self.pytex_config.build_dir_specification.tex_source_root,
+                self.pytex_config.build_dir_specification.doc_root
+            ]
+            return [
+                path.absolute().resolve() for path in dirs
+            ]
+        return []
+
+    def is_ignored_in_build_dir(self, path: RelativePath) -> bool:
+        real_path: Path = path.absolute().resolve()
+        ignored_dirs = self._ignored_subfolders_in_build_dir()
+        for ignored_dir in ignored_dirs:
+            if ignored_dir in real_path.parents:
+                return True
+        return path.relative_path.name in [
+            VERSION_INFO_FILE, '.pytexrc'
+        ]
 
     def build_tex_sources(self) -> bool:
         self._build_target_type = PyTeXRootDirType.TEX_SOURCE
diff --git a/PyTeX/format/docstrip_formatter.py b/PyTeX/format/docstrip_formatter.py
index 2282f0f..2efd28d 100644
--- a/PyTeX/format/docstrip_formatter.py
+++ b/PyTeX/format/docstrip_formatter.py
@@ -1,5 +1,5 @@
 import tempfile
-
+import os
 from .enums import TeXType
 from .formatting_config import FormattingConfig
 from .pytex_formatter import PyTeXFormatter
@@ -15,9 +15,9 @@ class DocStripFormatter(PyTeXFormatter):
     @property
     def output_files(self) -> List[str]:
         if self.config.tex_out_type == TeXType.TeXClass:
-            return self.name + '.cls'
-        elif self.config.tex_out_type == TeXType.TeXClass:
-            return self.name + '.sty'
+            return [self.raw_name + '.cls']
+        elif self.config.tex_out_type == TeXType.TeXPackage:
+            return [self.raw_name + '.sty']
         else:
             raise NotImplementedError
 
@@ -28,13 +28,18 @@ class DocStripFormatter(PyTeXFormatter):
             tmp_dir
         )
         if self.input_file.with_suffix('.ins').exists():
+            shutil.copy(
+                self.input_file.with_suffix('.ins'),
+                tmp_dir
+            )
             result = subprocess.run(
-                ['tex', self.input_file.with_suffix('.ins').name],
+                ["tex", self.input_file.with_suffix('.ins').name],
                 cwd=tmp_dir,
-                stderr=subprocess.STDOUT
+                stderr=subprocess.DEVNULL,  # TODO
+                stdout=subprocess.DEVNULL  # TODO
             )
             if not result.returncode == 0:
-                raise NotImplementedError
+                raise NotImplementedError('no correct returncode')
         else:
             result = subprocess.run(
                 ['pdflatex', self.input_file.name],
@@ -46,7 +51,7 @@ class DocStripFormatter(PyTeXFormatter):
         for file in self.output_files:
             outfile = tmp_dir / file
             if not outfile.exists():
-                raise NotImplementedError
+                raise NotImplementedError(f'output file {outfile} does not exist')
             shutil.copy(outfile, build_dir)
         shutil.rmtree(tmp_dir)
         return []  # No future config