diff -Naur qt-everywhere-src-5.12.4-orig/qtbase/mkspecs/features/default_post.prf qt-everywhere-src-5.12.4/qtbase/mkspecs/features/default_post.prf
--- qt-everywhere-src-5.12.4-orig/qtbase/mkspecs/features/default_post.prf	2019-06-15 15:09:10.556066900 +0300
+++ qt-everywhere-src-5.12.4/qtbase/mkspecs/features/default_post.prf	2019-06-15 15:21:47.611796700 +0300
@@ -105,8 +105,8 @@
 
 breakpad {
     load(resolve_target)
-    DEBUGFILENAME = $$shell_quote($$system_path($$QMAKE_RESOLVED_TARGET))
-    PROJECTPATH = $$shell_quote($$system_path($$OUT_PWD))
+    DEBUGFILENAME = $$shell_quote($$shell_path($$QMAKE_RESOLVED_TARGET))
+    PROJECTPATH = $$shell_quote($$shell_path($$OUT_PWD))
 
     !isEmpty(QMAKE_POST_LINK):QMAKE_POST_LINK = $$QMAKE_POST_LINK$$escape_expand(\\n\\t)
     QMAKE_POST_LINK = $$QMAKE_POST_LINK$$quote($${QT_BREAKPAD_ROOT_PATH}$${QMAKE_DIR_SEP}qtbreakpadsymbols $$DEBUGFILENAME $$PROJECTPATH)
diff -Naur qt-everywhere-src-5.12.4-orig/qtbase/mkspecs/features/incredibuild_xge.prf qt-everywhere-src-5.12.4/qtbase/mkspecs/features/incredibuild_xge.prf
--- qt-everywhere-src-5.12.4-orig/qtbase/mkspecs/features/incredibuild_xge.prf	2019-06-12 23:59:14.000000000 +0300
+++ qt-everywhere-src-5.12.4/qtbase/mkspecs/features/incredibuild_xge.prf	2019-06-15 15:21:47.611796700 +0300
@@ -3,6 +3,6 @@
     EOC = $$escape_expand(\\r\\h)
 
     for(xge, INCREDIBUILD_XGE) {
-        $${xge}.commands = Rem IncrediBuild_AllowRemote $$EOC Rem IncrediBuild_OutputFile $$system_path($${xge}.output) $$EOC $$eval($${xge}.commands)
+        $${xge}.commands = Rem IncrediBuild_AllowRemote $$EOC Rem IncrediBuild_OutputFile $$shell_path($${xge}.output) $$EOC $$eval($${xge}.commands)
     }
 }
diff -Naur qt-everywhere-src-5.12.4-orig/qtbase/mkspecs/features/java.prf qt-everywhere-src-5.12.4/qtbase/mkspecs/features/java.prf
--- qt-everywhere-src-5.12.4-orig/qtbase/mkspecs/features/java.prf	2019-06-12 23:59:14.000000000 +0300
+++ qt-everywhere-src-5.12.4/qtbase/mkspecs/features/java.prf	2019-06-15 15:21:47.611796700 +0300
@@ -28,7 +28,7 @@
 javac_source_version = $$ANDROID_JAVAC_SOURCE_VERSION
 isEmpty(javac_source_version): javac_source_version = 7
 
-javac.commands = javac -source $$javac_source_version -target $$javac_target_version -Xlint:unchecked -bootclasspath $$ANDROID_JAR_FILE -cp $$shell_quote($$system_path($$join(JAVACLASSPATH, $$DIRLIST_SEPARATOR))) -d $$shell_quote($$CLASS_DIR) ${QMAKE_FILE_IN}
+javac.commands = javac -source $$javac_source_version -target $$javac_target_version -Xlint:unchecked -bootclasspath $$ANDROID_JAR_FILE -cp $$shell_quote($$shell_path($$join(JAVACLASSPATH, $$DIRLIST_SEPARATOR))) -d $$shell_quote($$CLASS_DIR) ${QMAKE_FILE_IN}
 
 # Force rebuild every time, because we don't know the paths of the destination files
 # as they depend on the code.
diff -Naur qt-everywhere-src-5.12.4-orig/qtbase/mkspecs/features/testcase.prf qt-everywhere-src-5.12.4/qtbase/mkspecs/features/testcase.prf
--- qt-everywhere-src-5.12.4-orig/qtbase/mkspecs/features/testcase.prf	2019-06-12 23:59:14.000000000 +0300
+++ qt-everywhere-src-5.12.4/qtbase/mkspecs/features/testcase.prf	2019-06-15 15:21:47.611796700 +0300
@@ -70,8 +70,7 @@
 # Allow for custom arguments to tests
 $${type}.commands += $(TESTARGS)
 
-!isEmpty(TESTRUN_CWD):!contains(TESTRUN_CWD, ^\\./?): \
-    $${type}.commands = $$QMAKE_CD $$shell_path($$TESTRUN_CWD) && $$eval($${type}.commands)
+    $${type}.commands = $$QMAKE_CD $$system_path($$TESTRUN_CWD) && $$eval($${type}.commands)
 
 # If the test is marked as insignificant, discard the exit code
 insignificant_test: $${type}.commands = -$$eval($${type}.commands)
diff -Naur qt-everywhere-src-5.12.4-orig/qtbase/mkspecs/features/win32/windeployqt.prf qt-everywhere-src-5.12.4/qtbase/mkspecs/features/win32/windeployqt.prf
--- qt-everywhere-src-5.12.4-orig/qtbase/mkspecs/features/win32/windeployqt.prf	2019-06-12 23:59:14.000000000 +0300
+++ qt-everywhere-src-5.12.4/qtbase/mkspecs/features/win32/windeployqt.prf	2019-06-15 15:21:47.627396700 +0300
@@ -3,9 +3,9 @@
 build_pass {
     load(resolve_target)
 
-    isEmpty(WINDEPLOYQT_OPTIONS): WINDEPLOYQT_OPTIONS = -qmldir $$shell_quote($$system_path($$_PRO_FILE_PWD_))
-    WINDEPLOYQT_TARGET = $$shell_quote($$system_path($$QMAKE_RESOLVED_TARGET))
-    WINDEPLOYQT_OUTPUT = $$shell_quote($$system_path($$dirname(QMAKE_RESOLVED_TARGET)/$$basename(TARGET).windeployqt))
+    isEmpty(WINDEPLOYQT_OPTIONS): WINDEPLOYQT_OPTIONS = -qmldir $$shell_quote($$shell_path($$_PRO_FILE_PWD_))
+    WINDEPLOYQT_TARGET = $$shell_quote($$shell_path($$QMAKE_RESOLVED_TARGET))
+    WINDEPLOYQT_OUTPUT = $$shell_quote($$shell_path($$dirname(QMAKE_RESOLVED_TARGET)/$$basename(TARGET).windeployqt))
     windeployqt.target = windeployqt
     windeployqt.commands = $$QMAKE_WINDEPLOYQT $$WINDEPLOYQT_OPTIONS -list target $$WINDEPLOYQT_TARGET > $$WINDEPLOYQT_OUTPUT
 
diff -Naur qt-everywhere-src-5.12.4-orig/qtbase/qtbase.pro qt-everywhere-src-5.12.4/qtbase/qtbase.pro
--- qt-everywhere-src-5.12.4-orig/qtbase/qtbase.pro	2019-06-12 23:59:14.000000000 +0300
+++ qt-everywhere-src-5.12.4/qtbase/qtbase.pro	2019-06-15 15:21:47.627396700 +0300
@@ -57,7 +57,7 @@
 # qtPrepareTool() to find the non-installed syncqt.
 prefix_build|!equals(PWD, $$OUT_PWD) {
 
-    cmd = perl -w $$system_path($$PWD/bin/syncqt.pl)
+    cmd = perl -w $$shell_path($$PWD/bin/syncqt.pl)
 
     TOOL_PRI = $$OUT_PWD/mkspecs/modules/qt_tool_syncqt.pri