UNIX">

X Window System">

calloc
"> `dlclose`"> `dlopen`"> `dlsym`"> `dup/dup2`"> `errno`"> `fcntl`"> `free`"> `fstat`"> `gethostbyaddr`"> `gethostbyname`"> `gethostname`"> `getrlimit`"> `getrusage`"> `getsockopt`"> `iconv`"> `link`"> `lstat`"> `malloc`"> `mblen`"> `mbstowcs`"> `mbtowc`"> `mmap`"> `qsort`"> `read`"> `rename`"> `select`"> `setsockopt`"> `shutdown`"> `stat`"> `strerror`"> `symlink`"> `sysconf`"> `uname`"> `wcstombs`"> `wctomb`">

regex.h
"> `stdlib.h`"> `fcntl.h`"> environment variable"> file descriptor">

cat
"> `chmod`"> `iconv`"> `ls`"> `/bin/sh`"> `uname`">