安装proftpd时出错

提示如下：
[root@localhost proftpd-1.2.9]# make
echo \#define BUILD_STAMP \"`date`\" >include/buildstamp.h
cd lib/ && make lib
make[1]: Entering directory `/opt/proftpd-1.2.9/lib'
gcc  -DLINUX  -I.. -I../include  -O2 -Wall -c pr_fnmatch.c
In file included from /usr/include/asm/sigcontext.h:4,
                 from /usr/include/bits/sigcontext.h:28,
                 from /usr/include/signal.h:333,
                 from /usr/include/sys/wait.h:31,
                 from ../include/conf.h:78,
                 from pr_fnmatch.c:38:
/usr/include/asm/types.h:6: 错误：与‘mode_t’类型冲突
/usr/include/sys/types.h:72: 错误：‘mode_t’的上一个声明在此
make[1]: *** [pr_fnmatch.o] 错误 1
make[1]: Leaving directory `/opt/proftpd-1.2.9/lib'
make: *** [lib] 错误 2
新军，等解答。谢谢