Installation on Slackware

I'm trying to install VMserver on Slackware but have problems to compile vmmon module.

Building the vmmon module.

Using 2.6.x kernel build system.

make: Entering directory `/tmp/vmware-config0/vmmon-only'

make -C /lib/modules/2.6.12.2/build/include/.. SUBDIRS=$PWD SRCROOT=$PWD/. modules

make[1]: Entering directory `/usr/src/linux-2.6.12.2'

  WARNING: Symbol version dump /usr/src/linux-2.6.12.2/Module.symvers

           is missing; modules will have no dependencies and modversions.

  CC   /tmp/vmware-config0/vmmon-only/linux/driver.o

  CC   /tmp/vmware-config0/vmmon-only/linux/hostif.o

  CC   /tmp/vmware-config0/vmmon-only/common/cpuid.o

  CC   /tmp/vmware-config0/vmmon-only/common/hash.o

  CC   /tmp/vmware-config0/vmmon-only/common/memtrack.o

  CC   /tmp/vmware-config0/vmmon-only/common/phystrack.o

  CC   /tmp/vmware-config0/vmmon-only/common/task.o

  CC   /tmp/vmware-config0/vmmon-only/common/vmx86.o

  CC   /tmp/vmware-config0/vmmon-only/vmcore/moduleloop.o

  LD   /tmp/vmware-config0/vmmon-only/vmmon.o

  Building modules, stage 2.

  MODPOST

/bin/sh: scripts/mod/modpost: No such file or directory

make[2]: *** \[__modpost] Error 127

make[1]: *** \[modules] Error 2

make[1]: Leaving directory `/usr/src/linux-2.6.12.2'

make: *** \[vmmon.ko] Error 2

make: Leaving directory `/tmp/vmware-config0/vmmon-only'

Unable to build the vmmon module.

For more information on how to troubleshoot module-related problems, please

visit our Web site at "http://www.vmware.com/download/modules/modules.html" and

"http://www.vmware.com/support/reference/linux/prebuilt_modules_linux.html".

Execution aborted.

What's going on here?

Thanks

Stella