/usr/share/doc/libnative-platform-java/api/net/rubygrapefruit/platform/internal/jni/ is in libnative-platform-java-doc 0.14-3.
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/usr/share/doc/libnative-platform-java/api/net/rubygrapefruit/platform/internal/jni/FileEventFunctions.html
/usr/share/doc/libnative-platform-java/api/net/rubygrapefruit/platform/internal/jni/MemoryFunctions.html
/usr/share/doc/libnative-platform-java/api/net/rubygrapefruit/platform/internal/jni/NativeLibraryFunctions.html
/usr/share/doc/libnative-platform-java/api/net/rubygrapefruit/platform/internal/jni/OsxMemoryFunctions.html
/usr/share/doc/libnative-platform-java/api/net/rubygrapefruit/platform/internal/jni/PosixFileFunctions.html
/usr/share/doc/libnative-platform-java/api/net/rubygrapefruit/platform/internal/jni/PosixFileSystemFunctions.html
/usr/share/doc/libnative-platform-java/api/net/rubygrapefruit/platform/internal/jni/PosixProcessFunctions.html
/usr/share/doc/libnative-platform-java/api/net/rubygrapefruit/platform/internal/jni/PosixTerminalFunctions.html
/usr/share/doc/libnative-platform-java/api/net/rubygrapefruit/platform/internal/jni/PosixTypeFunctions.html
/usr/share/doc/libnative-platform-java/api/net/rubygrapefruit/platform/internal/jni/TerminfoFunctions.html
/usr/share/doc/libnative-platform-java/api/net/rubygrapefruit/platform/internal/jni/WindowsConsoleFunctions.html
/usr/share/doc/libnative-platform-java/api/net/rubygrapefruit/platform/internal/jni/WindowsFileFunctions.html
/usr/share/doc/libnative-platform-java/api/net/rubygrapefruit/platform/internal/jni/WindowsHandleFunctions.html
/usr/share/doc/libnative-platform-java/api/net/rubygrapefruit/platform/internal/jni/WindowsRegistryFunctions.html
/usr/share/doc/libnative-platform-java/api/net/rubygrapefruit/platform/internal/jni/package-frame.html
/usr/share/doc/libnative-platform-java/api/net/rubygrapefruit/platform/internal/jni/package-summary.html
/usr/share/doc/libnative-platform-java/api/net/rubygrapefruit/platform/internal/jni/package-tree.html