atm the cmake module is only installed when cmake itself is used to build libwebp. but anyone who wants to use webp in their own projects need access to that webp module too. the autotools build system should be installing it as well.
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Currently cmake installs: WebPConfig.cmake WebPConfigVersion.cmake WebPTargets.cmake WebPTargets-release.cmake through use of CMakePackageConfigHelpers [1].
Creating a trivial WebPConfig.cmake in autoconf seems feasible, maintaining a Targets.cmake would be cumbersome. If a distro wanted this it might be better to extract those files from a cmake-based build.
As a workaround the autoconf based build does install pkg-config files which can be queried with FindPkgConfig() [2].
this should be the full path to the installed headers to be added to the client code's search path, e.g., /usr/local/include when including <webp/decode.h>