Shiboken execution fails on CentOS 7.2 with gcc 4.8.5

python setup.py  --qmake=$(which qmake) --build-tests --ignore-git --jobs=8 install

qt.shiboken: (shiboken) CLANG builtins includes directory: /work/logiciels/rh7/llvm/6.0.1/lib/clang/6.0.1/include
(minimal) clang_parseTranslationUnit2(0x0, cmd[7]=-isystem/work/logiciels/rh7/llvm/6.0.1/lib/clang/6.0.1/include -fPIC -fno-exceptions -Wno-constant-logical-operand -std=c++14 -I/work/scratch/logiciels/sources/pyside2/pyside-setup/sources/shiboken2/tests/libminimal /tmp/global_J46778.hpp)
(shiboken) clang_parseTranslationUnit2(0x0, cmd[6]=-isystem/work/logiciels/rh7/llvm/6.0.1/lib/clang/6.0.1/include -fPIC -fno-exceptions -Wno-constant-logical-operand -std=c++14 /tmp/nothing_J46774.hpp)
Detecting inconsistencies in typesystem...   [OK]

qt.shiboken: (shiboken) No C++ classes found!
/work/scratch/logiciels/sources/pyside2/pyside-setup/sources/shiboken2/tests/libminimal/listuser.h:32:10: fatal error: 'list' file not found

$ echo | clang++ -Wp,-v -x c++ - -fsyntax-only
clang -cc1 version 6.0.1 based upon LLVM 6.0.1 default target x86_64-unknown-linux-gnu
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 /work/logiciels/rh7/llvm/6.0.1/bin/../include/c++/v1
 /usr/local/include
 /work/logiciels/rh7/llvm/6.0.1/lib/clang/6.0.1/include
 /usr/include
End of search list.

diff --git i/sources/shiboken2/ApiExtractor/clangparser/compilersupport.cpp w/sources/shiboken2/ApiExtractor/clangparser/compilersupport.cpp
index 6554548..6f82fbd 100644
--- i/sources/shiboken2/ApiExtractor/clangparser/compilersupport.cpp
+++ w/sources/shiboken2/ApiExtractor/clangparser/compilersupport.cpp
@@ -178,6 +178,13 @@ QByteArrayList emulatedCompilerOptions()
         result.append(QByteArrayLiteral("-isystem"));
         result.append(clangBuiltinIncludesDir);
     }
+        const HeaderPaths gppPaths = gppInternalIncludePaths(QStringLiteral("clang++"));
+        for (const HeaderPath &h : gppPaths) \{
+            // if (h.path.contains("c++"))
+            // result.append(QByteArrayLiteral("-isystem"));
+            // result.append(h.path);
+            headerPaths.append(h);
+        }
     // Append the c++ include paths since Clang is unable to find <list> etc
     // on RHEL 7.4 with g++ 6.3. A fix for this has been added to Clang 5.0,
     // so, the code can be removed once Clang 5.0 is the minimum version.
@@ -194,7 +201,7 @@ QByteArrayList emulatedCompilerOptions()
     detectVulkan(&headerPaths);
     std::transform(headerPaths.cbegin(), headerPaths.cend(),
                    std::back_inserter(result), [](const HeaderPath &p) \{
-                       return HeaderPath::includeOption(p, true);
+                       return HeaderPath::includeOption(p, false);
     });
     return result;
 }