/usr/include/c++/7/cstdlib:75:15: fatal error: stdlib.h: No such file or directory #include_next <stdlib.h>

I've c++ qt project using opengl and CGAL but I've the following error:

/usr/include/c++/7/cstdlib:75:15: fatal error: stdlib.h: No such file or directory
 #include_next <stdlib.h>

I searched about the problem and most of solutions about -DENABLE_PRECOMPILED_HEADERS=OFF

I use it at .pro file and it doesn't solve the problem.

.pro file :

    QT       += core gui opengl
    QT += xml
    greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
    
    TARGET = try_gui
    TEMPLATE = app
    
     
        DEFINES += QT_DEPRECATED_WARNINGS
     
        #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
        
        
         DENABLE_PRECOMPILED_HEADERS=OFF
        SOURCES += \
                main.cpp \
                mainwindow.cpp \
            my_polyhedron.cpp \
            myqglwidget.cpp
        
        HEADERS += \
                mainwindow.h \
            my_polyhedron.h \
            myqglwidget.h \
            My_Halfedge_base.h \
            My_Face_base.h
        
        FORMS += \
                mainwindow.ui
        
LIBS +=  -L/lib64 -lgmp -lCGAL

        INCLUDEPATH +=/usr/include

the problem is solved when I remove INCLUDEPATH +=/usr/include from .pro file

but another errors are appears about reaching CGAL:

/usr/include/boost/graph/detail/adjacency_list.hpp:1755:5: note:   template argument deduction/substitution failed:
../try_gui/my_polyhedron.cpp:203:78: note:   ‘Surface {aka CGAL::Polyhedron_3<CGAL::Simple_cartesian<double> >}’ is not derived from ‘const boost::adj_list_helper<Config, Base>’
              .edge_index_map  (boost::get(CGAL::edge_external_index  ,surface))
                                                                              ^
../try_gui/my_polyhedron.cpp: In member function ‘void My_Polyhedron::drawTree(MyQGLWidget*, int)’:
../try_gui/my_polyhedron.cpp:329:27: error: ‘class CGAL::Kd_tree_node<CGAL::Search_traits_3<CGAL::Simple_cartesian<double> >, CGAL::Fair<CGAL::Search_traits_3<CGAL::Simple_cartesian<double> >, CGAL::Plane_separator<double> >, CGAL::Boolean_tag<true> >’ has no member named ‘size’
             if(leaves[i]->size() < 1) continue;
                           ^~~~
../try_gui/my_polyhedron.cpp:331:52: error: ‘class CGAL::Kd_tree_node<CGAL::Search_traits_3<CGAL::Simple_cartesian<double> >, CGAL::Fair<CGAL::Search_traits_3<CGAL::Simple_cartesian<double> >, CGAL::Plane_separator<double> >, CGAL::Boolean_tag<true> >’ has no member named ‘begin’
             Tree::Point_d_iterator it = leaves[i]->begin();

n file included from /usr/include/CGAL/subdivision_method_3.h:31:0,
                 from ../try_gui/my_polyhedron.cpp:6:
/usr/include/CGAL/Subdivision_method_3/subdivision_methods_3.h: In instantiation of ‘void CGAL::Subdivision_method_3::Sqrt3_subdivision(PolygonMesh&, int) [with PolygonMesh = My_Polyhedron]’:
../try_gui/my_polyhedron.cpp:175:60:   required from here
/usr/include/CGAL/Subdivision_method_3/subdivision_methods_3.h:236:16: error: no type named ‘type’ in ‘struct boost::property_map<My_Polyhedron, boost::vertex_point_t, void>’
   Sqrt3(pmesh, Sqrt3_mask_3<PolygonMesh>(&pmesh, get(vertex_point,pmesh)), step);

any help?

I solve the proble by adding QMAKE_CFLAGS_ISYSTEM = -I

to .pro file