On rolling distros the usage of libpng submodule makes problems as the zlib system dependency of said module gets updated. Then the submodule regularly is too old to handle the updates zlib dependency.
Fix this maintenance churn by requiring libpng as system library as well. Then the distros package manager keeps those versions in sync.
This unfortunately requires users to install a new runtime/build dependency, but it still can be disabled with -DWITH_PNG=OFF.
On rolling distros the usage of
libpngsubmodule makes problems as thezlibsystem dependency of said module gets updated. Then the submodule regularly is too old to handle the updateszlibdependency.Fix this maintenance churn by requiring
libpngas system library as well. Then the distros package manager keeps those versions in sync.This unfortunately requires users to install a new runtime/build dependency, but it still can be disabled with
-DWITH_PNG=OFF.