diff -up ./config.tests/xrandr/xrandr.pro.0000 ./config.tests/xrandr/xrandr.pro
--- ./config.tests/xrandr/xrandr.pro.0000	2011-11-25 00:10:32.000000000 +0200
+++ ./config.tests/xrandr/xrandr.pro	2014-02-22 14:01:17.648726370 +0200
@@ -5,3 +5,4 @@ DEPENDPATH += .
 INCLUDEPATH += .
 SOURCES += main.cpp
 !win32:LIBS+=-lXrandr
+LIBS+=-lX11
diff -up ./src/gui/gui.pro.0000 ./src/gui/gui.pro
--- ./src/gui/gui.pro.0000	2011-11-25 00:10:32.000000000 +0200
+++ ./src/gui/gui.pro	2014-02-22 14:01:17.649726331 +0200
@@ -17,4 +17,4 @@ macx:LIBS       += -framework Carbon
 # means that each library must explicitly link to all dependencies 
 # than assuming that the application or another library will bring
 # in the necessary symbols at run time.
-contains(QMAKE_LFLAGS, "-Wl,--no-undefined"):LIBS += $${QMAKE_LIBS_X11}
+LIBS += $${QMAKE_LIBS_X11} -lX11
diff -up ./src/network/network.pro.0000 ./src/network/network.pro
--- ./src/network/network.pro.0000	2014-02-22 14:01:37.991932357 +0200
+++ ./src/network/network.pro	2014-02-22 14:01:50.734434980 +0200
@@ -3,6 +3,7 @@ DEFINES         += BUILD_QXT_NETWORK
 QT               = core network
 QXT              = core
 CONVENIENCE     += $$CLEAN_TARGET
+LIBS            += -lc
 
 include(network.pri)
 include(../qxtbase.pri)