udisks1 is deprecated and going away, so removing this clause
will permit us to build without udisks at all.

--- solid/solid/CMakeLists.txt
+++ solid/solid/CMakeLists.txt
@@ -283,20 +283,6 @@
            backends/udisks2/udisksgenericinterface.cpp
            backends/udisks2/dbus/manager.cpp
            )
-       else ( WITH_SOLID_UDISKS2 )
-           message(STATUS "Building Solid UDisks backend." )
-           set(solid_LIB_SRCS ${solid_LIB_SRCS}
-           backends/udisks/udisksmanager.cpp
-           backends/udisks/udisksdevice.cpp
-           backends/udisks/udisksblock.cpp
-           backends/udisks/udisksstoragevolume.cpp
-           backends/udisks/udisksdeviceinterface.cpp
-           backends/udisks/udisksopticaldisc.cpp
-           backends/udisks/udisksopticaldrive.cpp
-           backends/udisks/udisksstoragedrive.cpp
-           backends/udisks/udisksstorageaccess.cpp
-           backends/udisks/udisksgenericinterface.cpp
-          )
        endif ( WITH_SOLID_UDISKS2 )
    endif (CMAKE_SYSTEM_NAME MATCHES Linux)

--- solid/solid/managerbase.cpp
+++ solid/solid/managerbase.cpp
@@ -33,8 +33,6 @@
 #include "backends/hal/halmanager.h"
 #if defined (WITH_SOLID_UDISKS2)
 #include "backends/udisks2/udisksmanager.h"
-#else
-#include "backends/udisks/udisksmanager.h"
 #endif
 #include "backends/upower/upowermanager.h"
 
@@ -88,11 +86,9 @@
                     m_backends << new Solid::Backends::UDev::UDevManager(0);
 #               endif
 #		if defined(WITH_SOLID_UDISKS2)
-                m_backends << new Solid::Backends::UDisks2::Manager(0)
-#		else
-                m_backends << new Solid::Backends::UDisks::UDisksManager(0)
+                m_backends << new Solid::Backends::UDisks2::Manager(0);
 #		endif
-                           << new Solid::Backends::UPower::UPowerManager(0)
+                m_backends << new Solid::Backends::UPower::UPowerManager(0)
                            << new Solid::Backends::Fstab::FstabManager(0);
             }
 #        endif