libQcustomPlot is required for the build.

debian/control

@@ -21,7 +21,8 @@ Build-Depends: debhelper-compat (= 12),
  graphviz,
  libpappsomspp-dev (>= 0.8.11),
  libpappsomspp-widget-dev (>= 0.8.11),
- libodsstream-dev (>= 0.7.9)
+ libodsstream-dev (>= 0.7.9),
+ libqcustomplot-dev(>= 2.0)
 Standards-Version: 4.5.1
 Vcs-Browser: https://salsa.debian.org/debichem-team/masschroq
 Vcs-Git: https://salsa.debian.org/debichem-team/masschroq.git