unistd
dup2-obsolete
msvc-inval [test $HAVE_DUP2 = 0 || test $REPLACE_DUP2 = 1]
+msvc-nothrow [test $HAVE_DUP2 = 0 || test $REPLACE_DUP2 = 1]
configure.ac:
gl_FUNC_DUP2
if test $HAVE_DUP2 = 0 || test $REPLACE_DUP2 = 1; then
AC_LIBOBJ([dup2])
+ gl_PREREQ_DUP2
fi
gl_UNISTD_MODULE_INDICATOR([dup2])