Why build from sources

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This page is intended to offer good answers why it is beneficial to build software from sources rather than installing binaries.

Building software from sources ..

allows use of non-default build options (USE flags)
allows use of custom compiler/linker flags (e.g. runtime optimization, hardening, address sanitizer)
reduces risk of running malicious code unnoticed (since it is harder to conceal in source code than in binaries)