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make[1]: Entering directory `/usr/src/zaptel-1.4.5.1'
make -C /lib/modules/2.6.23/build SUBDIRS=/usr/src/zaptel-1.4.5.1 modules
make[2]: Entering directory `/usr/src/kernels/linux-2.6.23'
  CC [M]  /usr/src/zaptel-1.4.5.1/zaptel-base.o
/usr/src/zaptel-1.4.5.1/zaptel-base.c: In function ‘__putbuf_chunk’:
/usr/src/zaptel-1.4.5.1/zaptel-base.c:6387: error: ‘struct sk_buff’ has no member named ‘mac’
make[3]: *** [/usr/src/zaptel-1.4.5.1/zaptel-base.o] Error 1
make[2]: *** [_module_/usr/src/zaptel-1.4.5.1] Error 2
make[2]: Leaving directory `/usr/src/kernels/linux-2.6.23'
make[1]: *** [modules] Error 2
make[1]: Leaving directory `/usr/src/zaptel-1.4.5.1'
make: *** [all] Error 2