The reproducibility of software artifacts is a critical aspect of software development and application. However, current research indicates that a notable proportion of C/C++ projects encounter non-reproducibility issues stemming from build failures, primarily attributed to the absence of necessary packages. This paper introducesPackHunter, a novel technique that automates the recovery of missing packages in C/C++ projects. By identifying missing files during the project's build process,PackHuntercan determine potentially missing packages and synthesize an installation script. Specifically, it simplifies C/C++ projects through program reduction to reduce build overhead and simulates the presence of missing files via mock build to ensure a successful build for probing missing files. Besides,PackHunterleverages a sophisticated design to eliminate packages that do not contain the required missing files, effectively reducing the search space. Furthermore,PackHunterintroduces a greedy strategy to prioritize the packages, eventually recovering missing packages with few times of package enumeration. We have implementedPackHunteras a tool and evaluated it on 30 real-world projects. The results demonstrate thatPackHuntercan recover missing packages efficiently, achieving 26.59$\boldsymbol{\times}$speed up over the state-of-the-art approach. The effectiveness ofPackHunterhighlights its potential to assist developers in building C/C++ artifacts and promote software reproducibility.