The following line of code in raidlib.c in the 0.90 version of raidtools is incorrect: #define OLD_MDTOOLS ((md_ver.major == 0) && (md_ver.minor < 0.50)) md_ver.minor is an integral type and hence the constant should be 50 not 0.50 . (My apologies, but I am not a subscribed to this mailing list so if this is the wrong place to report bugs, will someone please email me.) -Z-