Fix bug in like terms collection in expression simplification Like term collection would lose the actual "variable" part of the term if the second term collected happened to have no coefficient. This would cause the expression to take the value of the calculated coefficient which is obviously wrong. Thanks to hider <stego@satx.rr.com> for reporting the bug and providing a proper test case. Observation: this bug has been present since the first pre-release of lwtools 3.0 when the algebraic expression system was introduced. Apparently people tend not to create expressions that trigger the like terms handler. The specific conditions require the symbol to be undefined and the second operand to the addition has to have no coefficient so it's likely a fairly rare scenario. Still, it is somewhat surprising that nobody tripped on it before now.

If there are no html files in the "manual" directory and there is no
"manual.html" file, it means that you have either checked out the source
repository on a non-release branch or the packager messed up.

In either case, if you have "docbook2html" installed, you should be able
to build the manual with one of the following:

docbook2html -o manual manual.docbook.sgml

or

docbook2html -u manual.docbook.sgml && mv manual.docbook.html manual/manual.html

PDF can be generated by doing:

docbook2pdf -u manual.docbook.sgml && mv manual.docbook.pdf manual/manual.pdf