[root@devel3 perl-5.8.3]# grep -R "#define dXSUB_SYS" ./*
./dosish.h:#define dXSUB_SYS
./epoc/epocish.h:#define dXSUB_SYS
./mpeix/mpeixish.h:#define dXSUB_SYS
./os2/os2ish.h:#define dXSUB_SYS OS2_XS_init()
./plan9/plan9ish.h:#define dXSUB_SYS
./unixish.h:#define dXSUB_SYS
./vms/vmsish.h:#define dXSUB_SYS
[root@devel3 perl-5.8.3]#