$_CC = defined("CC")? CC: "cc";

$_CFLAGS = array();
$_LDFLAGS = array();

$_SOURCES = array();
$_OBJECTS = array();

$_OUT = defined("OUT")? OUT: defined("OUTPUT")? OUTPUT: "out";

if (defined("CFLAGS"))
  $_CFLAGS = arrcat($_CFLAGS, words(CFLAGS));

if (defined("LDFLAGS"))
  $_LDFLAGS = arrcat($_LDFLAGS, words(LDFLAGS));

function pkg_config() {
  global $_CFLAGS, $_LDFLAGS;

  foreach (getargs(), $name) {
    $_CFLAGS = arrcat($_CFLAGS, words(rtrim(`pkg-config --cflags $name`)));
    $_LDFLAGS = arrcat($_LDFLAGS, words(rtrim(`pkg-config --libs $name`)));
  }
}

function sources() {
  global $_SOURCES;

  foreach (getargs(), $source) {
    if (!isarray($source))
      $source = words($source);

    $_SOURCES = arrcat($_SOURCES, $source);  
  }
}

function flags() {
  global $_CFLAGS;

  foreach (getargs(), $flag) {
    if (!isarray($flag))
      $flag = words($flag);

    $_CFLAGS = arrcat($_CFLAGS, $flag);  
  }
}

function compile() {
  global $_CC, $_CFLAGS, $_SOURCES, $_OBJECTS;

  foreach ($_SOURCES, $source) {
    $object = replace($source, ".c", ".o");
    $cflags = unwords($_CFLAGS);

    if (!isfile($object) || mtime($source) > mtime($object))
      `$_CC $cflags -c $source`;

    push($_OBJECTS, $object);
  }
}

function link() {
  global $_CC, $_LDFLAGS, $_OBJECTS, $_OUT;

  foreach ($_OBJECTS, $object) {
    if (!isfile($_OUT) || mtime($_OUT) < mtime($object)) {
      $objects = unwords($_OBJECTS);
      $ldflags = unwords($_LDFLAGS);

      `$_CC $ldflags $objects -o $_OUT`;

      break;
    }
  }
}