trap HK Leung misuse

git-svn-id: http://svn.r-project.org/R/trunk@62183 00db46b3-68df-0310-9c12-caf00c1e9a41
update

git-svn-id: http://svn.r-project.org/R/trunk@62184 00db46b3-68df-0310-9c12-caf00c1e9a41
update

git-svn-id: http://svn.r-project.org/R/trunk@62186 00db46b3-68df-0310-9c12-caf00c1e9a41
increase minimal system versions of zlib and PCRE

git-svn-id: http://svn.r-project.org/R/trunk@62187 00db46b3-68df-0310-9c12-caf00c1e9a41