This is especially bad because an application that does -lmozjs-52 -llz4 will not be linked with liblz4 and will use liblz4 implementation from libmozjs-52 instead. $ LC_ALL=C comm -12 <(/usr/lib/rpm/provided_symbols /lib64/liblz4.so.1) \ <(/usr/lib/rpm/provided_symbols /usr/lib64/libmozjs-52.so) LZ4_compress LZ4_compressBound LZ4_compress_continue LZ4_compress_default LZ4_compress_destSize LZ4_compress_fast LZ4_compress_fast_continue LZ4_compress_fast_extState LZ4_compress_limitedOutput LZ4_compress_limitedOutput_continue LZ4_compress_limitedOutput_withState LZ4_compress_withState LZ4_create LZ4_createStream LZ4_createStreamDecode LZ4_decompress_fast LZ4_decompress_fast_continue LZ4_decompress_fast_usingDict LZ4_decompress_fast_withPrefix64k LZ4_decompress_safe LZ4_decompress_safe_continue LZ4_decompress_safe_partial LZ4_decompress_safe_usingDict LZ4_decompress_safe_withPrefix64k LZ4_freeStream LZ4_freeStreamDecode LZ4_loadDict LZ4_resetStream LZ4_resetStreamState LZ4_saveDict LZ4_setStreamDecode LZ4_sizeofState LZ4_sizeofStreamState LZ4_slideInputBuffer LZ4_uncompress LZ4_uncompress_unknownOutputSize LZ4_versionNumber LZ4_versionString The offending code is mfbt/Compression.cpp:21:#include "lz4.c"