Fixes libclang parsing on Fedora

src/source_clang.cc

@@ -226,6 +226,7 @@ std::vector<std::string> Source::ClangViewParse::get_compilation_commands() {
   if(std::regex_match(clang_version_string, sm, clang_version_regex)) {
     auto clang_version=sm[1].str();
     arguments.emplace_back("-I/usr/lib/clang/"+clang_version+"/include");
+    arguments.emplace_back("-I/usr/lib64/clang/"+clang_version+"/include"); // For Fedora
 #if defined(__APPLE__) && CINDEX_VERSION_MAJOR==0 && CINDEX_VERSION_MINOR<32
     arguments.emplace_back("-I/usr/local/Cellar/llvm/"+clang_version+"/lib/clang/"+clang_version+"/include");
     arguments.emplace_back("-I/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1");