splitting of PATH on a separate line. Use 'uname -v' instead of 'uname -r' on Unixware. The release number of UNIX SYSV (ie, R5) is less important to us than the version (7.x.y).
this removes a dependency on SUNWlibm on Solaris. noted by Marc Herbert <Marc.Herbert@sun.com> way back in April 2003.