libfontbox-java is not sufficient to build "gnucash-docs" package.
As Filippo suggested, switching to libfontbox2-java is probably a good idea. To build "gnucash-docs" 3.6 I had to export JAVA_CLASSPATH=/usr/share/java/fontbox2.jar in order to trick "fop" into using fontbox2 (instead of fontbox). -- Best wishes, Dmitry Smirnov. --- The curse of man, and the cause of nearly all his woe, is his stupendous capacity for believing the incredible. -- H. L. Mencken
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