diff --git a/common.pri b/common.pri
index 0f9657695..dbf41753a 100644
--- a/common.pri
+++ b/common.pri
@@ -100,18 +100,20 @@ defineTest(forceCopyToDestdir) {
 
 # We use precompiled headers for more fast compilation source code.
 defineReplace(set_PCH){
-    macx:clang*{
-    # Precompiled headers don't work with clang on macx.
-    } else {
-        CONFIG += precompile_header # Turn on creation precompiled headers (PCH).
-        export(CONFIG) # export value to global variable.
+    unix:no_ccache|win32{
+        macx:clang*{
+        # Precompiled headers don't work with clang on macx.
+        } else {
+            CONFIG += precompile_header # Turn on creation precompiled headers (PCH).
+            export(CONFIG) # export value to global variable.
 
-        PRECOMPILED_HEADER = stable.h # Header file with all all static headers: libraries, static local headers.
-        export(PRECOMPILED_HEADER) # export value to global variable
+            PRECOMPILED_HEADER = stable.h # Header file with all all static headers: libraries, static local headers.
+            export(PRECOMPILED_HEADER) # export value to global variable
 
-        win32-msvc* {
-            PRECOMPILED_SOURCE = stable.cpp # MSVC need also cpp file.
-            export(PRECOMPILED_SOURCE) # export value to global variable.
+            win32-msvc* {
+                PRECOMPILED_SOURCE = stable.cpp # MSVC need also cpp file.
+                export(PRECOMPILED_SOURCE) # export value to global variable.
+            }
         }
     }
     return(true)
diff --git a/src/libs/qmuparser/qmuparser.cpp b/src/libs/qmuparser/qmuparser.cpp
index fdab2e0a9..249352fac 100644
--- a/src/libs/qmuparser/qmuparser.cpp
+++ b/src/libs/qmuparser/qmuparser.cpp
@@ -322,8 +322,8 @@ void QmuParser::InitFun()
  */
 void QmuParser::InitConst()
 {
-    DefineConst("_pi", (qreal)M_PI);
-    DefineConst("_e", (qreal)M_E);
+    DefineConst("_pi", static_cast<qreal>(M_PI));
+    DefineConst("_e", static_cast<qreal>(M_E));
 }
 
 //---------------------------------------------------------------------------------------------------------------------
diff --git a/src/libs/qmuparser/qmuparsertest.cpp b/src/libs/qmuparser/qmuparsertest.cpp
index 8b5d77005..3e6b16fa2 100644
--- a/src/libs/qmuparser/qmuparsertest.cpp
+++ b/src/libs/qmuparser/qmuparsertest.cpp
@@ -1264,8 +1264,8 @@ int QmuParserTester::EqnTest ( const QString &a_str, double a_fRes, bool a_fPass
 
         p1.reset ( new qmu::QmuParser() );
         // Add constants
-        p1->DefineConst ( "pi", ( qreal ) M_PI );
-        p1->DefineConst ( "e", ( qreal ) M_E );
+        p1->DefineConst ( "pi", static_cast<qreal>(M_PI) );
+        p1->DefineConst ( "e", static_cast<qreal>(M_E) );
         p1->DefineConst ( "const", 1 );
         p1->DefineConst ( "const1", 2 );
         p1->DefineConst ( "const2", 3 );
diff --git a/src/libs/vdxf/dxflib/dl_writer_ascii.cpp b/src/libs/vdxf/dxflib/dl_writer_ascii.cpp
index 295934b50..932ec9ac4 100644
--- a/src/libs/vdxf/dxflib/dl_writer_ascii.cpp
+++ b/src/libs/vdxf/dxflib/dl_writer_ascii.cpp
@@ -31,6 +31,7 @@
 
 #include <stdio.h>
 #include <string.h>
+#include <QtGlobal>
 
 #include "dl_writer_ascii.h"
 
diff --git a/src/libs/vlayout/vlayout.pro b/src/libs/vlayout/vlayout.pro
index 3daacee7c..23b723fb0 100644
--- a/src/libs/vlayout/vlayout.pro
+++ b/src/libs/vlayout/vlayout.pro
@@ -59,6 +59,11 @@ CONFIG(debug, debug|release){
                 -isystem "$${OUT_PWD}/$${RCC_DIR}" \
                 $$GCC_DEBUG_CXXFLAGS # See common.pri for more details.
 
+            # -isystem key works only for headers. In some cases it's not enough. But we can't delete these warnings and
+            # want them in the global list. Compromise decision is to delete them from the local list.
+            QMAKE_CXXFLAGS -= \
+                -Wno-long-long \
+
             noAddressSanitizer{ # For enable run qmake with CONFIG+=noAddressSanitizer
                 # do nothing
             } else {