GF/src is now for 2.9, and the new sources are in src-3.0 - keep it this way until the release of GF 3

src-3.0/tools/c++/README

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+Aarne Ranta 21/9/2006
+
+Interpreter for ready-made translation lists. Supports
+translation, random generation, and translation quiz.
+
+To compile:
+
+  g++ -o gfex gfex.cpp
+
+To use:
+
+  ./gfex peace.gft
+
+To produce a gft file in GF: 
+
+  gt | tb -unlexer=unwords -compact | wf foo.gft
+
+The format uses encoding of words as integers, which
+gives a memory-efficient run-time program. Also the
+treebank file size is about 1/3 of sentences stored
+in words.