$ comm -12 <(/usr/lib/rpm/provided_symbols /lib64/libz.so.1 |sort) \
<(/usr/lib/rpm/provided_symbols /usr/bin/Xvnc |sort)
adler32
adler32_combine
compress
compress2
compressBound
crc32
crc32_combine
deflate
deflateBound
deflateCopy
deflateEnd
deflateInit_
deflateInit2_
deflateParams
deflatePrime
deflateReset
deflateSetDictionary
deflateSetHeader
deflateTune
get_crc_table
inflate
inflateCopy
inflateEnd
inflateGetHeader
inflateInit_
inflateInit2_
inflatePrime
inflateReset
inflateSetDictionary
inflateSync
inflateSyncPoint
zError
zlibCompileFlags
zlibVersion

$ grep -F /zlib/ beehive/logs/Sisyphus-x86_64/latest/success/turbovnc-1.2.1-alt3
[  2%] Building C object common/zlib/CMakeFiles/zlib.dir/adler32.c.o
[  4%] Building C object common/zlib/CMakeFiles/zlib.dir/compress.c.o
[  7%] Building C object common/zlib/CMakeFiles/zlib.dir/crc32.c.o
[  9%] Building C object common/zlib/CMakeFiles/zlib.dir/deflate.c.o
[ 12%] Building C object common/zlib/CMakeFiles/zlib.dir/gzio.c.o
[ 14%] Building C object common/zlib/CMakeFiles/zlib.dir/infback.c.o
[ 17%] Building C object common/zlib/CMakeFiles/zlib.dir/inffast.c.o
[ 19%] Building C object common/zlib/CMakeFiles/zlib.dir/inflate.c.o
[ 21%] Building C object common/zlib/CMakeFiles/zlib.dir/inftrees.c.o
[ 24%] Building C object common/zlib/CMakeFiles/zlib.dir/trees.c.o
[ 26%] Building C object common/zlib/CMakeFiles/zlib.dir/uncompr.c.o
[ 29%] Building C object common/zlib/CMakeFiles/zlib.dir/zutil.c.o

$ comm -12 <(/usr/lib/rpm/provided_symbols /usr/lib64/libfreetype.so.6 |sort) \
<(/usr/lib/rpm/provided_symbols /usr/bin/Xvnc |sort)
FT_Activate_Size
FT_Add_Default_Modules
FT_Add_Module
FT_Angle_Diff
FT_Atan2
FT_Attach_File
FT_Attach_Stream
FT_CeilFix
FT_Cos
FT_DivFix
FT_Done_Face
FT_Done_FreeType
FT_Done_Glyph
FT_Done_Library
FT_Done_Size
FT_FloorFix
FT_Get_BDF_Charset_ID
FT_Get_BDF_Property
FT_Get_Char_Index
FT_Get_First_Char
FT_Get_Glyph
FT_Get_Glyph_Name
FT_Get_Kerning
FT_Get_Module
FT_Get_Name_Index
FT_Get_Next_Char
FT_Get_Postscript_Name
FT_Get_PS_Font_Info
FT_Get_Renderer
FT_Get_Sfnt_Name
FT_Get_Sfnt_Name_Count
FT_Get_Sfnt_Table
FT_Get_X11_Font_Format
FT_Glyph_Copy
FT_Glyph_Get_CBox
FT_Glyph_To_Bitmap
FT_Glyph_Transform
FT_Has_PS_Glyph_Names
FT_Init_FreeType
FT_Library_Version
FT_List_Add
FT_List_Finalize
FT_List_Find
FT_List_Insert
FT_List_Iterate
FT_List_Remove
FT_List_Up
FT_Load_Char
FT_Load_Glyph
FT_Load_Sfnt_Table
FT_Matrix_Invert
FT_Matrix_Multiply
FT_MulDiv
FT_MulFix
FT_New_Face
FT_New_Library
FT_New_Memory_Face
FT_New_Size
FT_Open_Face
FT_Outline_Check
FT_Outline_Copy
FT_Outline_Decompose
FT_Outline_Done
FT_Outline_Get_BBox
FT_Outline_Get_Bitmap
FT_Outline_Get_CBox
FT_Outline_New
FT_Outline_Render
FT_Outline_Reverse
FT_Outline_Transform
FT_Outline_Translate
FT_Remove_Module
FT_Render_Glyph
FT_RoundFix
FT_Select_Charmap
FT_Set_Charmap
FT_Set_Char_Size
FT_Set_Debug_Hook
FT_Set_Pixel_Sizes
FT_Set_Renderer
FT_Set_Transform
FT_Sin
FT_Stream_OpenGzip
FT_Tan
FT_Vector_From_Polar
FT_Vector_Length
FT_Vector_Polarize
FT_Vector_Rotate
FT_Vector_Transform
FT_Vector_Unit