put line 356. Underfull \hbox (badness 10000) in paragraph at lines 354--357 []\EU1/DejaVuSerif(0)/m/n/10 The compiler version can be tested within compiled code with the [7] [8] Chapter 3. LaTeX Warning: Hyper reference `glasgow_exts:patsyn-typing' on page 9 undefined on input line 386. LaTeX Warning: Reference `glasgow_exts:patsyn-typing' on page 9 undefined on in put line 386. [9] ! FancyVerb Error: Empty verbatim environment . \FV@Error ...ncyVerb Error:^^J\space \space #1^^J} l.422 \end{Verbatim} Output written on users_guide.pdf (13 pages). Transcript written on users_guide.log. docs/users_guide/ghc.mk:18: recipe for target 'docs/users_guide/users_guide.pdf' failed gmake[1]: *** [docs/users_guide/users_guide.pdf] Error 1 Makefile:129: recipe for target 'all' failed gmake: *** [all] Error 2