diff --git a/Makefile b/Makefile
index aedb5080279c76c385f8a945aff2e3a5bb2c36f7..7eebeffcc9821e1961dd8ed2c6c9a509b2eb8cc5 100644
--- a/Makefile
+++ b/Makefile
@@ -58,16 +58,22 @@ conan-install:
 	   conan install . -s $(CONAN_SETTINGS) --build=missing)
 .PHONY: conan-install
 
+conan-install-debug:
+	conan install . -s $(CONAN_SETTINGS) -s build_type=Debug || \
+	  (echo "'conan install' failed, trying to build from sources..."; \
+	   conan install . -s $(CONAN_SETTINGS) -s build_type=Debug --build=missing)
+.PHONY: conan-install-debug
+
 conan-create:
 	conan create . -s $(CONAN_SETTINGS)
 .PHONY: conan-create
 
 conan-create-debug:
 	conan create . -s $(CONAN_SETTINGS) -s build_type=Debug
-.PHONY: conan-create
+.PHONY: conan-create-debug
 
 conan: conan-install conan-create
 .PHONY: conan
 
-conan-debug: conan-install conan-create-debug
+conan-debug: conan-install-debug conan-create-debug
 .PHONY: conan-debug
diff --git a/doc/README_SETUP.md b/doc/README_SETUP.md
index c0b56bfe627596b4765084d1cf4457acfb7e7545..bed634a8a90d13090797a524746ad79afe5dbdb8 100644
--- a/doc/README_SETUP.md
+++ b/doc/README_SETUP.md
@@ -81,7 +81,7 @@ Depending on the clang version it might be necessary to use additionally the fol
 For the tests there is a slightly different setup required (with option `-D CMAKE_BUILD_TYPE=Debug`)
 
 1. `mkdir build && cd build/`
-2. `conan install .. -s "compiler.libcxx=libstdc++11"`
+2. `conan install .. -s "compiler.libcxx=libstdc++11"` (on MacOS: ` -s compiler.cppstd=17`)
 3. `cmake -B . -D CMAKE_BUILD_TYPE=Debug ..`
    * If your clang-format version is too old, formatting, linting etc. can be skipped:  
      `cmake -B . -D CMAKE_BUILD_TYPE=Debug -D SKIP_LINTING=ON ..`
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index aefe6846d23f2cc3a145cbf6158101e7e1bb3df4..07a2092b76c4bd72e428e1d2c7b7e733e8994eea 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -88,6 +88,7 @@ configure_file(${CMAKE_CURRENT_SOURCE_DIR}/caosdb_test_utility.h.in
 
 include(CodeCoverage)
 
+# TODO: Also test for gcov linking path, or add SKIP_COV option.
 if (LCOV_PATH)
     message(STATUS "Found LCOV: ${LCOV_PATH}")
     target_link_libraries(caosdb gcov)