diff --git a/INSTALL.swift b/INSTALL.swift
index a07d5b24c2d8c75778e2a24d90f77724459ab61f..8e1635b0715426512503fd9dcde32f59a7ad1b62 100644
--- a/INSTALL.swift
+++ b/INSTALL.swift
@@ -83,39 +83,65 @@ SWIFT depends on a number of third party libraries that should be available
 before you can build it.
 
 
-HDF5: a HDF5 library (v. 1.8.x or higher) is required to read and write
-particle data. One of the commands "h5cc" or "h5pcc" should be
-available. If "h5pcc" is located them a parallel HDF5 built for the version
-of MPI located should be provided. If the command is not available then it
-can be located using the "--with-hfd5" configure option. The value should
-be the full path to the "h5cc" or "h5pcc" commands.
+ - HDF5: a HDF5 library (v. 1.8.x or higher) is required to read and
+         write particle data. One of the commands "h5cc" or "h5pcc"
+         should be available. If "h5pcc" is located them a parallel
+         HDF5 built for the version of MPI located should be
+         provided. If the command is not available then it can be
+         located using the "--with-hfd5" configure option. The value
+         should be the full path to the "h5cc" or "h5pcc" commands.
 
 
-MPI: an optional MPI library that fully supports MPI_THREAD_MULTIPLE.
-Before running configure the "mpirun" command should be available in the
-shell. If your command isn't called "mpirun" then define the "MPIRUN"
-environment variable, either in the shell or when running configure.
+ - MPI: to run on more than one node an MPI library that fully
+        supports MPI_THREAD_MULTIPLE.  Before running configure the
+        "mpirun" command should be available in the shell. If your
+        command isn't called "mpirun" then define the "MPIRUN"
+        environment variable, either in the shell or when running
+        configure.
 
-The MPI compiler can be controlled using the MPICC variable, much like
-the CC one. Use this when your MPI compiler has a none-standard name.
+	The MPI compiler can be controlled using the MPICC variable,
+	much like the CC one. Use this when your MPI compiler has a
+	none-standard name.
 
 
-METIS: a build of the METIS library can be optionally used to optimize the
-load between MPI nodes (requires an MPI library). This should be found in
-the standard installation directories, or pointed at using the
-"--with-metis" configuration option.  In this case the top-level
-installation directory of the METIS build should be given. Note to use
-METIS you should at least supply "--with-metis".
+ - libtool: The build system relies on libtool.
 
 
-libNUMA: a build of the NUMA library can be used to pin the threads to
-the physical core of the machine SWIFT is running on. This is not always
-necessary as the OS scheduler may do a good job at distributing the threads
-among the different cores on each computing node.
+                           Optional Dependencies
+                           =====================
 
 
-DOXYGEN: the doxygen library is required to create the SWIFT API
-documentation.
+ - METIS: a build of the METIS library can be optionally used to
+          optimize the load between MPI nodes (requires an MPI
+          library). This should be found in the standard installation
+          directories, or pointed at using the "--with-metis"
+          configuration option.  In this case the top-level
+          installation directory of the METIS build should be
+          given. Note to use METIS you should at least supply
+          "--with-metis".
+
+
+ - libNUMA: a build of the NUMA library can be used to pin the threads
+            to the physical core of the machine SWIFT is running
+            on. This is not always necessary as the OS scheduler may
+            do a good job at distributing the threads among the
+            different cores on each computing node.
+
+
+ - TCMalloc: a build of the TCMalloc library (part of gperftools) can
+             be used to obtain faster allocations than the standard C
+             malloc function part of glibc. The option "-with-tcmalloc"
+	     should be passed to the configuration script to use it.
+
+
+ - gperftools: a build of gperftools can be used to obtain good
+               profiling of the code. The option "-with-profiler"
+               needs to be passed to the configuration script to use
+               it.
+
+
+ - DOXYGEN: the doxygen library is required to create the SWIFT API
+            documentation.
 
 
 
diff --git a/configure.ac b/configure.ac
index 977a86a03d5e4c82139dfd56d3f1ee7afe3ea6e8..f6e2ea0db8e9829b719a0190eea7a1d891bfbbd6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -355,7 +355,7 @@ fi
 AC_SUBST([TCMALLOC_LIBS])
 AM_CONDITIONAL([HAVETCMALLOC],[test -n "$TCMALLOC_LIBS"])
 
-#  Check for -lprofiler usually part of the gpreftools along with tcmalloc.
+#  Check for -lprofiler usually part of the gperftools along with tcmalloc.
 have_profiler="no"
 AC_ARG_WITH([profiler],
    [AS_HELP_STRING([--with-profiler],