+GNU Autoconf is needed if you intend to build from the CVS sources, it
+is <em/not/ needed if you just intend to build a standard source
+distribution.
+
+Autoconf builds the @configure@ script from @configure.in@ and
+@aclocal.m4@. If you modify either of these files, you'll need
+Autoconf to rebuild @configure@.
+
+<tag>@sed@</tag>
+<nidx>pre-supposed: sed</nidx>
+<nidx>sed, pre-supposed</nidx>
+
+You need a working @sed@ if you are going to build from sources. The
+build-configuration stuff needs it. GNU sed version 2.0.4 is no good!
+It has a bug in it that is tickled by the build-configuration. 2.0.5
+is ok. Others are probably ok too (assuming we don't create too
+elaborate configure scripts..)
+</descrip>
+
+One @fptools@ project is worth a quick note at this point, because it
+is useful for all the others: @glafp-utils@ contains several utilities
+which aren't particularly Glasgow-ish, but Occasionally Indispensable.
+Like @lndir@ for creating symbolic link trees.
+
+<sect1> Tools for building parallel GHC (GPH)
+<label id="pre-supposed-gph-tools">
+<p>
+
+<descrip>
+<tag>PVM version 3:</tag>
+<nidx>pre-supposed: PVM3 (Parallel Virtual Machine)</nidx>
+<nidx>PVM3 (Parallel Virtual Machine), pre-supposed</nidx>
+
+PVM is the Parallel Virtual Machine on which Parallel Haskell programs
+run. (You only need this if you plan to run Parallel Haskell.
+Concurent Haskell, which runs concurrent threads on a uniprocessor
+doesn't need it.) Underneath PVM, you can have (for example) a
+network of workstations (slow) or a multiprocessor box (faster).
+
+The current version of PVM is 3.3.11; we use 3.3.7. It is readily
+available on the net; I think I got it from @research.att.com@, in
+@netlib@.
+
+A PVM installation is slightly quirky, but easy to do. Just follow
+the @Readme@ instructions.
+
+<tag>@bash@:</tag>