error compiling Direct-FB-0.9.20

[Markus Frahm]

Hello, 
I got the following error message
checking linux/wm97xx.h usability... no
checking linux/wm97xx.h presence... yes
configure: WARNING: linux/wm97xx.h: present but cannot be compiled
configure: WARNING: linux/wm97xx.h: check for missing prerequisite headers?
configure: WARNING: linux/wm97xx.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for linux/wm97xx.h... yes

In file included from /usr/include/linux/wm97xx.h:9,
                 from wm97xx_ts.c:49:
/usr/include/linux/ac97_codec.h:230: error: syntax error before "u16"
/usr/include/linux/ac97_codec.h:231: error: syntax error before "u8"
/usr/include/linux/ac97_codec.h:259: error: syntax error before '}' token
wm97xx_ts.c: In function `wm97xxtsEventThread':
wm97xx_ts.c:79: error: `TS_EVENT' undeclared (first use in this function)
wm97xx_ts.c:79: error: (Each undeclared identifier is reported only once
wm97xx_ts.c:79: error: for each function it appears in.)
wm97xx_ts.c:79: error: syntax error before "ts_event"
wm97xx_ts.c:87: error: `ts_event' undeclared (first use in this function)


Greetings
  Markus Frahm