"build capacities" is correct and usable in written English.
You could use it when talking about developing abilities or skills, or when talking about increasing the size or capacity of something. For example: "The company's goal is to build capacities and increase their production rate."
Girls and boys are contributing to analysing the risks faced by their communities, what they can do to help educate their families and peers about the risks and solutions to risks, encouraging others to take part in community-based resilience-building and helping to build capacities, knowledge and confidence.
In addition, and equally as important, the most fulfilling aspect of this job is to build capacities and skills of our national teams: they are the cornerstone of many of our interventions as they know the context, the environment, and have been there before.
Helping organizations to build capacities to track the 'key ingredients' of their successes will help ensure that successes are replicated and services can be improved to maximize the benefit that people receive from them.
A fundamental question that the UN World Data Forum will need to address is the question of how we can build capacities and disseminate knowledge in a more comprehensive, inclusive and participatory way.
Challenges in implementing the SDGs, increased data demands from all parts of society, new possibilities stemming from innovations in collecting, disseminating and using data -- all of these developments seem to call for more than just incremental change in the way we build capacities.
Donors still need to fulfill the extensive financial and political commitments they have made to Africa, and it remains up to African leaders to inspire processes and build capacities to translate the continent's wealth and potential into tangible benefits for its citizens.
