Bug 2955. Workaround for lack of atomic operations in GCCE standard libraries (fall back to default use of Mutex)
# handle pkg-config files
for(PKGCONFIG_LIB, $$list($$unique(PKGCONFIG))) {
QMAKE_CXXFLAGS += $$system(pkg-config --cflags $$PKGCONFIG_LIB)
QMAKE_CFLAGS += $$system(pkg-config --cflags $$PKGCONFIG_LIB)
LIBS += $$system(pkg-config --libs $$PKGCONFIG_LIB)
}