Related to #419: added missing include folder for MacOS llvm 9.0.0_1 homebrew package

src/compile_commands.cc

@@ -151,6 +151,7 @@ std::vector<std::string> CompileCommands::get_arguments(const boost::filesystem:
     arguments.emplace_back("-I/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1");          // Missing include folder in llvm 8.0.0
     arguments.emplace_back("-I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include"); // Missing include folder in newer MacOS versions
     arguments.emplace_back("-I/usr/local/Cellar/llvm/" + clang_version + "/lib/clang/" + clang_version + "/include");                       // Missing include folder in llvm 9.0.0
+    arguments.emplace_back("-I/usr/local/Cellar/llvm/" + clang_version + "_1/lib/clang/" + clang_version + "/include");                     // Missing include folder in llvm 9.0.0_1
 #endif
 #endif
 #ifdef _WIN32