Introduced the QT.<module>.plugins variable to module profiles.

modules/qt_declarative.pri

@@ -9,6 +9,7 @@ QT.declarative.includes = $$QT_MODULE_INCLUDE_BASE $$QT_MODULE_INCLUDE_BASE/QtDe
 QT.declarative.private_includes = $$QT_MODULE_INCLUDE_BASE/QtDeclarative/private
 QT.declarative.sources = $$QT_MODULE_BASE/src/declarative
 QT.declarative.libs = $$QT_MODULE_LIB_BASE
+QT.declarative.plugins = $$QT_MODULE_PLUGIN_BASE
 QT.declarative.imports = $$QT_MODULE_IMPORT_BASE
 QT.declarative.depends = gui script network
 QT.declarative.DEFINES = QT_DECLARATIVE_LIB

src/plugins/qmltooling/qmldbg_tcp/qmldbg_tcp.pro

@@ -3,7 +3,7 @@ QT       += declarative network
 
 include(../../qpluginbase.pri)
 
-QTDIR_build:DESTDIR  = $$QT_BUILD_TREE/plugins/qmltooling
+DESTDIR = $$QT.declarative.plugins/qmltooling
 QTDIR_build:REQUIRES += "contains(QT_CONFIG, declarative)"
 
 SOURCES += \