employ QMAKE_USE: LIBS += -lfoo

this switches all instances of LIBS[_PRIVATE] += -lfoo where a config
tests exists for foo.
this removes some code duplication between tests and project files (in
case of conditionals), and ensures that the projects always actually use
the libraries configure has found.

Change-Id: Ia7e80c8db5f329290c7f1a4e03a8bf78882a687e
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

29 files changed, 39 insertions, 104 deletions

diff --git a/configure.json b/configure.json
index d5610a6402..004d7777fd 100644
--- a/configure.json
+++ b/configure.json
@@ -236,7 +236,6 @@
     "libraries": {
         "libatomic": {
             "description": "64 bit atomics in libatomic",
-            "export": "",
             "test": "common/atomic64",
             "sources": [
                 "-latomic"
@@ -252,7 +251,6 @@
         },
         "doubleconversion": {
             "description": "DoubleConversion",
-            "export": "",
             "test": "unix/doubleconversion",
             "sources": [
                 "-ldouble-conversion"
@@ -260,7 +258,6 @@
         },
         "pcre": {
             "description": "PCRE",
-            "export": "",
             "test": "unix/pcre",
             "sources": [
                 "-lpcre16"
@@ -269,7 +266,6 @@
         "zlib": {
             "description": "zlib",
             "test": "unix/zlib",
-            "export": "",
             "sources": [
                 { "libs": "-lzdll", "condition": "config.msvc" },
                 { "libs": "-lz", "condition": "!config.msvc" }
@@ -277,7 +273,7 @@
         },
         "gnu_iconv": {
             "description": "GNU libiconv",
-            "export": "",
+            "export": "iconv",
             "test": "unix/gnu-libiconv",
             "sources": [
                 "-liconv"
@@ -333,7 +329,6 @@
         },
         "libproxy": {
             "description": "libproxy",
-            "export": "",
             "test": "common/libproxy",
             "sources": [
                 "-lproxy"
@@ -354,7 +349,6 @@
         },
         "cups": {
             "description": "CUPS",
-            "export": "",
             "test": "unix/cups",
             "sources": [
                 "-lcups"
@@ -362,7 +356,6 @@
         },
         "libjpeg": {
             "description": "libjpeg",
-            "export": "",
             "test": "unix/libjpeg",
             "sources": [
                 { "libs": "-llibjpeg", "condition": "config.msvc" },
@@ -371,7 +364,6 @@
         },
         "libpng": {
             "description": "libpng",
-            "export": "",
             "test": "unix/libpng",
             "sources": [
                 { "type": "pkgConfig", "args": "libpng" },
@@ -430,7 +422,6 @@
         },
         "harfbuzz": {
             "description": "HarfBuzz",
-            "export": "",
             "test": "unix/harfbuzz",
             "sources": [
                 "-lharfbuzz"
@@ -477,7 +468,6 @@
         },
         "tslib": {
             "description": "tslib",
-            "export": "",
             "test": "unix/tslib",
             "sources": [
                 "-lts"
@@ -516,7 +506,6 @@
         },
         "xrender": {
             "description": "XRender",
-            "export": "",
             "test": "x11/xrender",
             "sources": [
                 "-lXrender"
@@ -541,7 +530,6 @@
         },
         "xcb_xlib": {
             "description": "XCB Xlib",
-            "export": "",
             "test": "qpa/xcb-xlib",
             "sources": [
                 { "type": "pkgConfig", "args": "X11-xcb x11 xcb" },
@@ -550,7 +538,6 @@
         },
         "xcb_xkb": {
             "description": "XCB XKB >= 1.10",
-            "export": "",
             "test": "qpa/xcb-xkb",
             "sources": [
                 { "type": "pkgConfig", "args": "xcb-xkb >= 1.10 xcb" },
@@ -575,7 +562,6 @@
         },
         "x11sm": {
             "description": "X11 session management",
-            "export": "",
             "sources": [
                 { "type": "pkgConfig", "args": "sm ice" }
             ]
@@ -612,7 +598,6 @@
         },
         "gbm": {
             "description": "GBM",
-            "export": "",
             "test": "qpa/gbm",
             "sources": [
                 { "type": "pkgConfig", "args": "gbm" }
@@ -620,7 +605,6 @@
         },
         "drm": {
             "description": "KMS",
-            "export": "",
             "test": "qpa/kms",
             "sources": [
                 { "type": "pkgConfig", "args": "libdrm" },
@@ -685,7 +669,6 @@
         },
         "pps": {
             "description": "PPS",
-            "export": "",
             "test": "unix/pps",
             "sources": [
                 "-lpps"
@@ -694,7 +677,6 @@
         "lgmon": {
             "description": "lgmon",
             "test": "unix/lgmon",
-            "export": "",
             "sources": [
                 "-llgmon"
             ]
@@ -2024,7 +2006,7 @@
         },
         "system-zlib": {
             "description": "Using system zlib",
-            "condition": "config.darwin || libs.zlib",
+            "condition": "libs.zlib",
             "output": [ "publicQtConfig" ]
         },
         "iconv": {
diff --git a/mkspecs/common/linux.conf b/mkspecs/common/linux.conf
index 28af74b491..1a39c88425 100644
--- a/mkspecs/common/linux.conf
+++ b/mkspecs/common/linux.conf
@@ -35,7 +35,6 @@ QMAKE_LIBS_OPENGL       = -lGL
 QMAKE_LIBS_OPENGL_ES2   = -lGLESv2
 QMAKE_LIBS_OPENVG       = -lOpenVG
 QMAKE_LIBS_THREAD       = -lpthread
-QMAKE_LIBS_LIBUDEV      = -ludev
 
 QMAKE_CFLAGS_WAYLAND    =
 QMAKE_INCDIR_WAYLAND    =
diff --git a/src/3rdparty/harfbuzz_dependency.pri b/src/3rdparty/harfbuzz_dependency.pri
index 36abbfbe35..f39bb62381 100644
--- a/src/3rdparty/harfbuzz_dependency.pri
+++ b/src/3rdparty/harfbuzz_dependency.pri
@@ -1,5 +1,5 @@
 contains(QT_CONFIG, system-harfbuzz) {
-    LIBS_PRIVATE += -lharfbuzz
+    QMAKE_USE_PRIVATE += harfbuzz
 } else: contains(QT_CONFIG, harfbuzz) {
     INCLUDEPATH += $$PWD/harfbuzz-ng/include
     LIBS_PRIVATE += -L$$QT_BUILD_TREE/lib -lqtharfbuzzng$$qtPlatformTargetSuffix()
diff --git a/src/3rdparty/pcre_dependency.pri b/src/3rdparty/pcre_dependency.pri
index 2a3c99c7ed..fa7df4df0e 100644
--- a/src/3rdparty/pcre_dependency.pri
+++ b/src/3rdparty/pcre_dependency.pri
@@ -3,5 +3,5 @@ pcre {
     INCLUDEPATH += $$PWD/pcre
     LIBS_PRIVATE += -L$$QT_BUILD_TREE/lib -lqtpcre$$qtPlatformTargetSuffix()
 } else {
-    LIBS_PRIVATE += -lpcre16
+    QMAKE_USE_PRIVATE += pcre
 }
diff --git a/src/3rdparty/png_dependency.pri b/src/3rdparty/png_dependency.pri
index 2ec2e8929d..12dbfc5487 100644
--- a/src/3rdparty/png_dependency.pri
+++ b/src/3rdparty/png_dependency.pri
@@ -1,14 +1,5 @@
 contains(QT_CONFIG, system-png) {
-    unix|mingw {
-        !contains(QT_CONFIG, no-pkg-config) {
-            CONFIG += link_pkgconfig
-            PKGCONFIG_PRIVATE += libpng
-        } else {
-            LIBS_PRIVATE += -lpng
-        }
-    } else {
-        LIBS += libpng.lib
-    }
+    QMAKE_USE_PRIVATE += libpng
 } else: contains(QT_CONFIG, png) {
     INCLUDEPATH += $$PWD/libpng
     LIBS_PRIVATE += -L$$QT_BUILD_TREE/lib -lqtpng$$qtPlatformTargetSuffix()
diff --git a/src/3rdparty/zlib_dependency.pri b/src/3rdparty/zlib_dependency.pri
index 53e0b3ef39..11ad70621d 100644
--- a/src/3rdparty/zlib_dependency.pri
+++ b/src/3rdparty/zlib_dependency.pri
@@ -1,10 +1,6 @@
 # zlib dependency satisfied by bundled 3rd party zlib or system zlib
 contains(QT_CONFIG, system-zlib) {
-    if(unix|mingw):LIBS_PRIVATE += -lz
-    else {
-        isEmpty(ZLIB_LIBS): LIBS += zdll.lib
-        else: LIBS += $$ZLIB_LIBS
-    }
+    QMAKE_USE_PRIVATE += zlib
 } else {
     INCLUDEPATH +=  $$PWD/zlib
     !no_core_dep {
diff --git a/src/corelib/arch/arch.pri b/src/corelib/arch/arch.pri
index 0f7c2b887b..2b9166f0a6 100644
--- a/src/corelib/arch/arch.pri
+++ b/src/corelib/arch/arch.pri
@@ -4,4 +4,4 @@ HEADERS += \
     arch/qatomic_bootstrap.h \
     arch/qatomic_cxx11.h
 
-atomic64-libatomic: LIBS += -latomic
+atomic64-libatomic: QMAKE_USE += libatomic
diff --git a/src/corelib/codecs/codecs.pri b/src/corelib/codecs/codecs.pri
index fdaec33c5a..275ade369a 100644
--- a/src/corelib/codecs/codecs.pri
+++ b/src/corelib/codecs/codecs.pri
@@ -46,7 +46,7 @@ contains(QT_CONFIG,icu) {
             SOURCES += codecs/qiconvcodec.cpp
             contains(QT_CONFIG, gnu-libiconv) {
                 DEFINES += GNU_LIBICONV
-                LIBS_PRIVATE *= -liconv
+                QMAKE_USE_PRIVATE += iconv
             } else: contains(QT_CONFIG, sun-libiconv) {
                 DEFINES += GNU_LIBICONV
             }
diff --git a/src/corelib/kernel/kernel.pri b/src/corelib/kernel/kernel.pri
index 8e45766f17..fea0d4ae2e 100644
--- a/src/corelib/kernel/kernel.pri
+++ b/src/corelib/kernel/kernel.pri
@@ -183,7 +183,7 @@ vxworks {
 }
 
 qqnx_pps {
-        LIBS_PRIVATE += -lpps
+        QMAKE_USE_PRIVATE += pps
         SOURCES += \
                 kernel/qppsattribute.cpp \
                 kernel/qppsobject.cpp
diff --git a/src/corelib/tools/tools.pri b/src/corelib/tools/tools.pri
index 853827e032..252dcf9fdc 100644
--- a/src/corelib/tools/tools.pri
+++ b/src/corelib/tools/tools.pri
@@ -193,7 +193,7 @@ INCLUDEPATH += ../3rdparty/md5 \
                ../3rdparty/sha3
 
 contains(QT_CONFIG, system-doubleconversion) {
-    LIBS_PRIVATE += -ldouble-conversion
+    QMAKE_USE_PRIVATE += doubleconversion
 } else: contains(QT_CONFIG, doubleconversion) {
     include($$PWD/../../3rdparty/double-conversion/double-conversion.pri)
 }
diff --git a/src/network/kernel/kernel.pri b/src/network/kernel/kernel.pri
index 34d2f164e8..c3e546eabc 100644
--- a/src/network/kernel/kernel.pri
+++ b/src/network/kernel/kernel.pri
@@ -64,6 +64,6 @@ osx:SOURCES += kernel/qnetworkproxy_mac.cpp
 else:win32:SOURCES += kernel/qnetworkproxy_win.cpp
 else:contains(QT_CONFIG, libproxy) {
     SOURCES += kernel/qnetworkproxy_libproxy.cpp
-    LIBS_PRIVATE += -lproxy
+    QMAKE_USE_PRIVATE += libproxy
 }
 else:SOURCES += kernel/qnetworkproxy_generic.cpp
diff --git a/src/platformsupport/glxconvenience/glxconvenience.pri b/src/platformsupport/glxconvenience/glxconvenience.pri
index cc5b198f6c..29aa2f6242 100644
--- a/src/platformsupport/glxconvenience/glxconvenience.pri
+++ b/src/platformsupport/glxconvenience/glxconvenience.pri
@@ -1,6 +1,6 @@
 contains(QT_CONFIG, xlib) {
     contains(QT_CONFIG,opengl):!contains(QT_CONFIG,opengles2) {
-        contains(QT_CONFIG, xrender): LIBS_PRIVATE += -lXrender
+        contains(QT_CONFIG, xrender): QMAKE_USE_PRIVATE += xrender
         LIBS_PRIVATE += $$QMAKE_LIBS_X11
         HEADERS += $$PWD/qglxconvenience_p.h
         SOURCES += $$PWD/qglxconvenience.cpp
diff --git a/src/platformsupport/input/tslib/tslib.pri b/src/platformsupport/input/tslib/tslib.pri
index c9fef1ca8f..9efd126e13 100644
--- a/src/platformsupport/input/tslib/tslib.pri
+++ b/src/platformsupport/input/tslib/tslib.pri
@@ -4,4 +4,4 @@ HEADERS += \
 SOURCES += \
     $$PWD/qtslib.cpp
 
-LIBS += -lts
+QMAKE_USE += tslib
diff --git a/src/plugins/generic/tslib/tslib.pro b/src/plugins/generic/tslib/tslib.pro
index 200d231cc8..d6a0eea3a0 100644
--- a/src/plugins/generic/tslib/tslib.pro
+++ b/src/plugins/generic/tslib/tslib.pro
@@ -4,7 +4,7 @@ SOURCES = main.cpp
 
 QT += gui-private platformsupport-private
 
-LIBS += -lts
+QMAKE_USE += tslib
 
 OTHER_FILES += tslib.json
 
diff --git a/src/plugins/imageformats/jpeg/jpeg.pro b/src/plugins/imageformats/jpeg/jpeg.pro
index 8954cc6402..3cbf60ec8a 100644
--- a/src/plugins/imageformats/jpeg/jpeg.pro
+++ b/src/plugins/imageformats/jpeg/jpeg.pro
@@ -6,10 +6,7 @@ SOURCES += main.cpp qjpeghandler.cpp
 HEADERS += main.h qjpeghandler_p.h
 
 contains(QT_CONFIG, system-jpeg) {
-    msvc: \
-        LIBS += libjpeg.lib
-    else: \
-        LIBS += -ljpeg
+    QMAKE_USE += libjpeg
 } else {
     include($$PWD/../../../3rdparty/libjpeg.pri)
 }
diff --git a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/eglfs_kms.pro b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/eglfs_kms.pro
index 6670a4c0bc..70ff054172 100644
--- a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/eglfs_kms.pro
+++ b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/eglfs_kms.pro
@@ -11,13 +11,7 @@ INCLUDEPATH += $$PWD/../.. $$PWD/../eglfs_kms_support
 # Avoid X11 header collision, use generic EGL native types
 DEFINES += QT_EGL_NO_X11
 
-CONFIG += link_pkgconfig
-!contains(QT_CONFIG, no-pkg-config) {
-    PKGCONFIG += libdrm gbm
-} else {
-    LIBS += -ldrm -lgbm
-}
-
+QMAKE_USE += gbm drm
 CONFIG += egl
 QMAKE_LFLAGS += $$QMAKE_LFLAGS_NOUNDEF
 
diff --git a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_egldevice/eglfs_kms_egldevice.pro b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_egldevice/eglfs_kms_egldevice.pro
index f613d68ecb..5f47b98369 100644
--- a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_egldevice/eglfs_kms_egldevice.pro
+++ b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_egldevice/eglfs_kms_egldevice.pro
@@ -7,13 +7,7 @@ INCLUDEPATH += $$PWD/../.. $$PWD/../eglfs_kms_support
 # Avoid X11 header collision, use generic EGL native types
 DEFINES += QT_EGL_NO_X11
 
-CONFIG += link_pkgconfig
-!contains(QT_CONFIG, no-pkg-config) {
-    PKGCONFIG += libdrm
-} else {
-    LIBS += -ldrm
-}
-
+QMAKE_USE += drm
 CONFIG += egl
 QMAKE_LFLAGS += $$QMAKE_LFLAGS_NOUNDEF
 
diff --git a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/eglfs_kms_support.pro b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/eglfs_kms_support.pro
index cc77810793..464c64539f 100644
--- a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/eglfs_kms_support.pro
+++ b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms_support/eglfs_kms_support.pro
@@ -9,13 +9,7 @@ INCLUDEPATH += $$PWD/../..
 # Avoid X11 header collision, use generic EGL native types
 DEFINES += QT_EGL_NO_X11
 
-CONFIG += link_pkgconfig
-!contains(QT_CONFIG, no-pkg-config) {
-    PKGCONFIG += libdrm
-} else {
-    LIBS += -ldrm
-}
-
+QMAKE_USE += drm
 CONFIG += egl
 QMAKE_LFLAGS += $$QMAKE_LFLAGS_NOUNDEF
 
diff --git a/src/plugins/platforms/eglfs/deviceintegration/eglfs_x11/eglfs_x11.pro b/src/plugins/platforms/eglfs/deviceintegration/eglfs_x11/eglfs_x11.pro
index 17be384955..10af57e487 100644
--- a/src/plugins/platforms/eglfs/deviceintegration/eglfs_x11/eglfs_x11.pro
+++ b/src/plugins/platforms/eglfs/deviceintegration/eglfs_x11/eglfs_x11.pro
@@ -8,7 +8,7 @@ DEFINES += QT_EGL_NO_X11
 INCLUDEPATH += $$PWD/../..
 
 CONFIG += egl
-LIBS += -lX11 -lX11-xcb -lxcb
+QMAKE_USE += xcb_xlib
 QMAKE_LFLAGS += $$QMAKE_LFLAGS_NOUNDEF
 
 SOURCES += $$PWD/qeglfsx11main.cpp \
diff --git a/src/plugins/platforms/openwfd/openwf.pro b/src/plugins/platforms/openwfd/openwf.pro
index 152e4f57d7..79f349f472 100644
--- a/src/plugins/platforms/openwfd/openwf.pro
+++ b/src/plugins/platforms/openwfd/openwf.pro
@@ -31,7 +31,8 @@ SOURCES += \
     qopenwfdportmode.cpp \
     qopenwfdwindow.cpp
 
-LIBS += -lWFD -lgbm -lGLESv2 -lEGL
+LIBS += -lWFD
+QMAKE_USE += gbm opengl_es2 egl
 
 PLUGIN_TYPE = platforms
 PLUGIN_CLASS_NAME = QOpenWFDIntegrationPlugin
diff --git a/src/plugins/platforms/qnx/qnx.pro b/src/plugins/platforms/qnx/qnx.pro
index 5a0f4f5c98..51ffa5624f 100644
--- a/src/plugins/platforms/qnx/qnx.pro
+++ b/src/plugins/platforms/qnx/qnx.pro
@@ -82,7 +82,7 @@ contains(QT_CONFIG, opengles2) {
     HEADERS += qqnxglcontext.h \
                qqnxeglwindow.h
 
-    LIBS += -lEGL
+    QMAKE_USE += egl
 }
 
 CONFIG(qqnx_pps) {
@@ -100,7 +100,7 @@ CONFIG(qqnx_pps) {
                qqnxnavigatoreventnotifier.h \
                qqnxvirtualkeyboardpps.h
 
-    LIBS += -lpps
+    QMAKE_USE += pps
     !contains(DEFINES, QT_NO_CLIPBOARD): LIBS += -lclipboard
 
     CONFIG(qqnx_imf) {
@@ -116,7 +116,7 @@ CONFIG(qqnx_pps) {
 lgmon {
     DEFINES += QQNX_LGMON
     SOURCES += qqnxlgmon.cpp
-    LIBS += -llgmon
+    QMAKE_USE += lgmon
 }
 
 OTHER_FILES += qnx.json
diff --git a/src/plugins/platforms/xcb/gl_integrations/gl_integrations_plugin_base.pri b/src/plugins/platforms/xcb/gl_integrations/gl_integrations_plugin_base.pri
index 8fd57da29d..b60de79fa0 100644
--- a/src/plugins/platforms/xcb/gl_integrations/gl_integrations_plugin_base.pri
+++ b/src/plugins/platforms/xcb/gl_integrations/gl_integrations_plugin_base.pri
@@ -30,6 +30,6 @@ contains(QT_CONFIG, xcb-qt) {
     LIBS += -L$$MODULE_BASE_OUTDIR/lib -lxcb-static$$qtPlatformTargetSuffix()
     QMAKE_USE += xcb
 } else {
-    !contains(DEFINES, QT_NO_XKB):LIBS += -lxcb-xkb
+    !contains(DEFINES, QT_NO_XKB): QMAKE_USE += xcb_xkb
     QMAKE_USE += xcb_syslibs
 }
diff --git a/src/plugins/platforms/xcb/gl_integrations/xcb_glx/xcb_glx.pro b/src/plugins/platforms/xcb/gl_integrations/xcb_glx/xcb_glx.pro
index 67fd68765a..adac4b2e22 100644
--- a/src/plugins/platforms/xcb/gl_integrations/xcb_glx/xcb_glx.pro
+++ b/src/plugins/platforms/xcb/gl_integrations/xcb_glx/xcb_glx.pro
@@ -5,12 +5,11 @@ include(../gl_integrations_plugin_base.pri)
 #should be removed from the sources
 DEFINES += XCB_USE_GLX XCB_USE_XLIB
 
-LIBS += -lxcb
-
 contains(QT_CONFIG, xcb-glx) {
     DEFINES += XCB_HAS_XCB_GLX
-    LIBS += -lxcb-glx
+    QMAKE_USE += xcb_glx
 }
+QMAKE_USE += xcb
 
 LIBS += $$QMAKE_LIBS_DYNLOAD
 
diff --git a/src/plugins/platforms/xcb/xcb_qpa_lib.pro b/src/plugins/platforms/xcb/xcb_qpa_lib.pro
index 1cf13c7795..b81d38fab1 100644
--- a/src/plugins/platforms/xcb/xcb_qpa_lib.pro
+++ b/src/plugins/platforms/xcb/xcb_qpa_lib.pro
@@ -42,12 +42,12 @@ DEFINES += QT_BUILD_XCB_PLUGIN
 # needed by Xcursor ...
 contains(QT_CONFIG, xcb-xlib) {
     DEFINES += XCB_USE_XLIB
-    LIBS += -lX11 -lX11-xcb
+    QMAKE_USE += xcb_xlib
 
     contains(QT_CONFIG, xinput2) {
         DEFINES += XCB_USE_XINPUT2
         SOURCES += qxcbconnection_xi2.cpp
-        LIBS += -lXi
+        QMAKE_USE += xinput2
         !isEmpty(QMAKE_XINPUT2_VERSION_MAJOR) {
             DEFINES += LIBXI_MAJOR=$$QMAKE_XINPUT2_VERSION_MAJOR \
                        LIBXI_MINOR=$$QMAKE_XINPUT2_VERSION_MINOR \
@@ -59,13 +59,13 @@ contains(QT_CONFIG, xcb-xlib) {
 # to support custom cursors with depth > 1
 contains(QT_CONFIG, xcb-render) {
     DEFINES += XCB_USE_RENDER
-    LIBS += -lxcb-render -lxcb-render-util
+    QMAKE_USE += xcb_render
 }
 
 # build with session management support
 contains(QT_CONFIG, xcb-sm) {
     DEFINES += XCB_USE_SM
-    LIBS += -lSM -lICE
+    QMAKE_USE += x11sm
     SOURCES += qxcbsessionmanager.cpp
     HEADERS += qxcbsessionmanager.h
 }
@@ -86,7 +86,7 @@ contains(QT_CONFIG, xcb-qt) {
     QMAKE_USE += xcb
 } else {
     LIBS += -lxcb-xinerama  ### there is no configure test for this!
-    !contains(DEFINES, QT_NO_XKB):LIBS += -lxcb-xkb
+    !contains(DEFINES, QT_NO_XKB): QMAKE_USE += xcb_xkb
     QMAKE_USE += xcb_syslibs
 }
 
diff --git a/src/plugins/printsupport/cups/cups.pro b/src/plugins/printsupport/cups/cups.pro
index 757408e7f7..58bc11606b 100644
--- a/src/plugins/printsupport/cups/cups.pro
+++ b/src/plugins/printsupport/cups/cups.pro
@@ -3,7 +3,7 @@ MODULE = cupsprintersupport
 
 QT += core-private gui-private printsupport printsupport-private
 
-LIBS_PRIVATE += -lcups
+QMAKE_USE_PRIVATE += cups
 
 INCLUDEPATH += ../../../printsupport/kernel
 
diff --git a/src/plugins/sqldrivers/db2/db2.pro b/src/plugins/sqldrivers/db2/db2.pro
index 31822ef8dc..eef65fac66 100644
--- a/src/plugins/sqldrivers/db2/db2.pro
+++ b/src/plugins/sqldrivers/db2/db2.pro
@@ -3,11 +3,7 @@ TARGET = qsqldb2
 HEADERS += $$PWD/qsql_db2_p.h
 SOURCES += $$PWD/qsql_db2.cpp $$PWD/main.cpp
 
-unix {
-    !contains(LIBS, .*db2.*):LIBS += -ldb2
-} else {
-    !contains(LIBS, .*db2.*):LIBS += -ldb2cli
-}
+QMAKE_USE += db2
 
 OTHER_FILES += db2.json
 
diff --git a/src/plugins/sqldrivers/ibase/ibase.pro b/src/plugins/sqldrivers/ibase/ibase.pro
index 8237245183..e5709207d1 100644
--- a/src/plugins/sqldrivers/ibase/ibase.pro
+++ b/src/plugins/sqldrivers/ibase/ibase.pro
@@ -3,13 +3,8 @@ TARGET = qsqlibase
 HEADERS += $$PWD/qsql_ibase_p.h
 SOURCES += $$PWD/qsql_ibase.cpp $$PWD/main.cpp
 
-unix {
-    !contains(LIBS, .*gds.*):!contains(LIBS, .*libfb.*):LIBS += -lgds
-} else {
-    !contains(LIBS, .*gds.*):!contains(LIBS, .*fbclient.*) {
-        LIBS += -lgds32_ms
-    }
-}
+# FIXME: ignores libfb (unix)/fbclient (win32) - but that's for the test anyway
+QMAKE_USE += ibase
 
 OTHER_FILES += ibase.json
 
diff --git a/src/plugins/sqldrivers/oci/oci.pro b/src/plugins/sqldrivers/oci/oci.pro
index a22d1181bf..e6ef71f20f 100644
--- a/src/plugins/sqldrivers/oci/oci.pro
+++ b/src/plugins/sqldrivers/oci/oci.pro
@@ -3,11 +3,8 @@ TARGET = qsqloci
 HEADERS += $$PWD/qsql_oci_p.h
 SOURCES += $$PWD/qsql_oci.cpp $$PWD/main.cpp
 
-unix {
-    !contains(LIBS, .*clnts.*):LIBS += -lclntsh
-} else {
-    LIBS *= -loci
-}
+QMAKE_USE += oci
+
 darwin:QMAKE_LFLAGS += -Wl,-flat_namespace,-U,_environ
 
 OTHER_FILES += oci.json
diff --git a/src/plugins/sqldrivers/sqlite2/sqlite2.pro b/src/plugins/sqldrivers/sqlite2/sqlite2.pro
index d0ab0eef41..721facb5b8 100644
--- a/src/plugins/sqldrivers/sqlite2/sqlite2.pro
+++ b/src/plugins/sqldrivers/sqlite2/sqlite2.pro
@@ -3,7 +3,7 @@ TARGET = qsqlite2
 HEADERS += $$PWD/qsql_sqlite2_p.h
 SOURCES += $$PWD/qsql_sqlite2.cpp $$PWD/smain.cpp
 
-!contains(LIBS, .*sqlite.*):LIBS += -lsqlite
+QMAKE_USE += sqlite2
 
 OTHER_FILES += sqlite2.json