Initial revision.

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+You need to have the GPC library installed on your system to build
+some of the scenery generation tools, otherwise you won't be able to
+create scenery.
+
+You can get the library from:
+
+    http://www.cs.man.ac.uk/aig/staff/alan/software/
+
+Unfortunately, because of some of the wording in the GPC licensing
+terms we are unable to include the GPC library with the Flight Gear
+distribution.
+
+This library comes as a single source file and header with no build
+directions.  So, here are some directions contributed by Riley Rainey
+<riley.rainey@websimulations.com>:
+
+
+1. Download the GPC library source code from URL:
+
+       http://www.cs.man.ac.uk/aig/staff/alan/software
+
+2. Unpack it; the current version seems to be 2.22:
+
+       $ zcat gpc222.tar.Z | tar xvf -
+
+3. Copy in the Makefile attached to this message:
+
+       $ cp Makefile ./gpc222
+
+4. Check install paths.  Edit the Makefile and make sure the install
+   paths are satisfactory.  Also make sure that all the make commands
+   have leading tabs (i.e. that the tabs aren't expanded out into 8
+   spaces) otherwise the make will fail.
+
+5. Build and install it:
+
+       $ cd ./gpc222
+       $ make
+       $ su
+       Password:
+        # make install
+
+
+-------------------------- snip ------------------------------
+
+# Unix/Linux makefile for GPC 2.22
+#
+# Riley Rainey  (riley.rainey@websimulations.com)
+
+CFLAGS = -O -g
+
+libgpc.a: gpc.o
+       rm -f $@
+       ar cr $@ $<
+       ranlib $@
+
+clean:
+       rm -f libgpc.a *.o core *~
+
+install: libgpc.a
+       -mkdir -p /usr/local/lib
+       -mkdir -p /usr/local/include
+       install libgpc.a /usr/local/lib/libgpc.a
+       install gpc.h /usr/local/include/gpc.h