This package is unmaintained. If you want to volunteer to take over the maintenance, contact me at https://wolfgang.esser-skala.at/contact/ .
Also see this issue.
The pgfgantt package provides the ganttchart environment, which draws a Gantt chart within a TikZ picture. The user may add various elements to the chart, for example, titles, bars, groups, milestones and different links between these elements. The appearance of the chart elements is highly customizable, and even new chart elements may be defined.
The package makes use of pgf/TikZ.
Run pgfgantt.ins through LaTeX and follow the instructions.