diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..6b881b98fc2d90ba4bff31e9d896590222164806
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,40 @@
+# ** header v3.0
+# This file is a part of the CaosDB Project.
+#
+# Copyright (C) 2021 IndiScale GmbH <info@indiscale.com>
+# Copyright (C) 2021 Daniel Hornung <d.hornung@indiscale.com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
+#
+# ** end header
+
+# This Makefile is a wrapper for several other scripts.
+
+
+CLANG-FORMAT = clang-format-11
+
+.PHONY: help
+help:
+	@echo "Targets:"
+	@echo "    conan-install - Install locally with Conan."
+	@echo "    style - auto-format the source files."
+
+style:
+	$(CLANG-FORMAT) -i --verbose \
+	 $$(find test/ src/ include/ -type f -iname "*.cpp" -o -iname "*.h" -o -iname "*.h.in")
+.PHONY: style
+
+conan-install:
+	conan create . -s "compiler.libcxx=libstdc++11"
+.PHONY: install
diff --git a/include/caosdb/status_code.h b/include/caosdb/status_code.h
index 021f89388a699ecc6ba5da2f159f90b959995af9..66574df7636e8ce55e2c53bae1dd445f797796ae 100644
--- a/include/caosdb/status_code.h
+++ b/include/caosdb/status_code.h
@@ -22,6 +22,8 @@
 #ifndef CAOSDB_STATUS_CODE_H
 #define CAOSDB_STATUS_CODE_H
 
+#include <string>
+
 /**
  * StatusCodes represent the status of this client, it's connections,
  * configuration and so on.