updated for version 7.4.254
Problem:    Smack support detection is incomplete.
Solution:   Check for attr/xattr.h and specific macro.
Added tag v7-4-254 for changeset 251acc686ca4
updated for version 7.4.255
Problem:    Configure check for smack doesn't work with all shells. (David
	    Larson)
Solution:   Remove spaces in set command.
Added tag v7-4-255 for changeset 5595506b985a
updated for version 7.4.256
Problem:    Using systemlist() may cause a crash and does not handle NUL
	    characters properly.
Solution:   Increase the reference count, allocate memory by length. (Yasuhiro
	    Matsumoto)
Added tag v7-4-256 for changeset afb542ea210c
updated for version 7.4.257
Problem:    Compiler warning, possibly for mismatch in parameter name.
Solution:   Rename the parameter in the declaration.
Added tag v7-4-257 for changeset 17903ded5e9a
updated for version 7.4.258
Problem:    Configure fails if $CC contains options.
Solution:   Remove quotes around $CC. (Paul Barker)
Added tag v7-4-258 for changeset e8ffd1e6c8dc