During a rebuild of all packages in sid, your package failed to build on
amd64.
Relevant part:
make[2]: Entering directory `/«PKGBUILDDIR»'
cd doc&& mlpost -latex manual.tex -pdf fig.ml&& pdflatex manual.tex
This is MetaPost, version 1.504 (kpathsea version 6.1.0)
(mpost.mp (/usr/share/texlive/texmf-dist/metapost/base/plain.mp
Preloading the plain mem file, version 1.004)) (./mlpost9c9b7e.mp
! I can't open file `mp-tool'.
l.1 input mp-tool
; % some initializations and auxiliary macros
Please type another input file name
! Emergency stop.
l.1 input mp-tool
; % some initializations and auxiliary macros
Transcript written on mlpost9c9b7e.log.
make[2]: *** [doc/manual.pdf] Error 1