Import Geant4 10.0.0 source tree

cmake/Modules/FindXvfb.cmake

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+# Check if Xvfb is installed.
+#  Xvfb is an X server that can run on machines with no display hardware 
+#  and no physical input devices.  
+#  It emulates a dumb framebuffer using virtual memory.
+# It is used to test graphic examples.
+
+# Usage of this module is as follows
+#
+#   find_package( Xvfb )
+#   if (XVFB_FOUND)
+#     ...
+# sets XVFB_EXECUTABLE
+
+
+set(XVFB_FOUND FALSE)
+
+if(UNIX)
+   find_program(XVFB_EXECUTABLE Xvfb
+	             PATHS /usr/bin
+					 DOC "Xvfb dumb framebuffer X server")
+endif()
+
+# handle the QUIETLY and REQUIRED arguments and set PYTHIA6_FOUND to TRUE if
+# all listed variables are TRUE
+INCLUDE(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(Xvfb DEFAULT_MSG XVFB_EXECUTABLE)
+				 
+mark_as_advanced(XVFB_FOUND XVFB_EXECUTABLE)