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@@ -98,6 +98,16 @@ $ ./configure --with-libtiff=/some/strange/location
$ ./configure --with-gsl=/some/strange/location
$ ./configure --disable-gtk
+At a minimum, you will need the HDF5 library (version 1.8.0 or later) and the
+GNU Scientific Library (GSL). For a full installation, you will also need
+libTIFF, libPNG, Cairo and GTK.
+
+You must use an installation of the HDF5 library which is thread safe. That
+means it must have been configured with the "--enable-threadsafe" option. Most
+binary distributions appear NOT to be like this. If you don't have a thread
+safe HDF5 library, just be sure not to use the "-j" option for any of the
+CrystFEL programs.
+
If you're compiling on Mac OS X, where GTK, libPNG and libTIFF seem to be much
harder to come by, disable lots of things: