编译drcom时的问题，不太明白

iLRainyday

redhat 5.3 , kernel 2.6.18

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make -C /lib/modules/2.6.18-128.el5/build M=/home/daniel/Softwares/drcom-1.4.8.1/kmod modules
make[2]: Entering directory `/usr/src/kernels/2.6.18-128.el5-i686'
  CC [M]  /home/daniel/Softwares/drcom-1.4.8.1/kmod/drcom.o
/home/daniel/Softwares/drcom-1.4.8.1/kmod/drcom.c: In function ‘sack_adjust’:
/home/daniel/Softwares/drcom-1.4.8.1/kmod/drcom.c:433: error: dereferencing pointer to incomplete type
/home/daniel/Softwares/drcom-1.4.8.1/kmod/drcom.c:433: error: dereferencing pointer to incomplete type
/home/daniel/Softwares/drcom-1.4.8.1/kmod/drcom.c:433: error: dereferencing pointer to incomplete type
/home/daniel/Softwares/drcom-1.4.8.1/kmod/drcom.c:433: error: dereferencing pointer to incomplete type
/home/daniel/Softwares/drcom-1.4.8.1/kmod/drcom.c:433: error: dereferencing pointer to incomplete type
/home/daniel/Softwares/drcom-1.4.8.1/kmod/drcom.c:433: error: dereferencing pointer to incomplete type
/home/daniel/Softwares/drcom-1.4.8.1/kmod/drcom.c:434: error: dereferencing pointer to incomplete type
/home/daniel/Softwares/drcom-1.4.8.1/kmod/drcom.c:434: error: dereferencing pointer to incomplete type
.... ....