帮忙看个语法错误

下面是一个异步清零的同步计数器的程序,错误在程序中标出了

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;

ENTITY counter IS
   PORT(areset, enable, clk : IN STD_LOGIC;
        q : OUT STD_LOGIC_VECTOR(3 DOWNTO 0);
        cout : OUT STD_LOGIC);
END counter;

ARCHITECTURE beh_counter OF counter IS
  variable cq : STD_LOGIC_VECTOR(3 DOWNTO 0);
  BEGIN
     PROCESS(areset, enable, clk)
        BEGIN
        if (areset = '1')  then
             cq := (others => '0');
        elsif (clk'EVENT AND clk = '1') then
            if(enable = '1') then
                 if(cq := 15)   cq := (others => '0'); cout <= '1';  --Error (10500): near text ":=";      expecting ")", or ","
                 else  cq := cq + 1;
                 end if;
            end if;
        end if;
      q <= cq;         --Error (10500): VHDL syntax error at counter.vhd(24) near text "if";  expecting "process"
      END PROCESS;
END beh_counter;

上面的第一个错误在IF后面少写了个then  不过加上之后编译Error (10500): VHDL syntax error at counter.vhd(20) near text ":=";  expecting ")", or ","

还是在第一个错误那里

已解决,谢谢大家