Depends-on:
stdlib
-malloca
-alloca-opt
-unistd
-environ
+malloca [test $HAVE_SETENV = 0 || test $REPLACE_SETENV = 1]
+alloca-opt [test $HAVE_SETENV = 0 || test $REPLACE_SETENV = 1]
+unistd [test $HAVE_SETENV = 0 || test $REPLACE_SETENV = 1]
+environ [test $HAVE_SETENV = 0 || test $REPLACE_SETENV = 1]
configure.ac:
gl_FUNC_SETENV