libqt5-qtbase/qmake-add-usr-include.diff

diff --git a/qmake/generators/unix/unixmake2.cpp b/qmake/generators/unix/unixmake2.cpp
index e4d33e2..920ebe9 100644
--- a/qmake/generators/unix/unixmake2.cpp
+++ b/qmake/generators/unix/unixmake2.cpp
@@ -128,7 +128,7 @@ UnixMakefileGenerator::writeMakeParts(QTextStream &t)
       << varGlue("DEFINES","-D"," -D","") << endl;
     t << "CFLAGS        = " << var("QMAKE_CFLAGS") << " $(DEFINES)\n";
     t << "CXXFLAGS      = " << var("QMAKE_CXXFLAGS") << " $(DEFINES)\n";
-    t << "INCPATH       = -I" << specdir();
+    t << "INCPATH       = -I/usr/include -I" << specdir();
     if(!project->isActiveConfig("no_include_pwd")) {
         QString pwd = escapeFilePath(fileFixify(qmake_getpwd()));
         if(pwd.isEmpty())