VMailMgr installation - umulig????

Jeg har forgæves prøvet at installere VMailMgr efter denne her HOWTO:
http://www.vmailmgr.org/docs/HOWTO.html

Jeg får fejl når jeg kører make:

make  all-recursive
make[1]: Entering directory `/usr/src/vmailmgr-0.96.9'
Making all in python
make[2]: Entering directory `/usr/src/vmailmgr-0.96.9/python'
python -c 'import types'
python -O -c 'import types'
make[2]: Leaving directory `/usr/src/vmailmgr-0.96.9/python'
Making all in php
make[2]: Entering directory `/usr/src/vmailmgr-0.96.9/php'
make[2]: Nothing to be done for `all'.
make[2]: Leaving directory `/usr/src/vmailmgr-0.96.9/php'
Making all in lib
make[2]: Entering directory `/usr/src/vmailmgr-0.96.9/lib'
Making all in misc
make[3]: Entering directory `/usr/src/vmailmgr-0.96.9/lib/misc'
c++ -DHAVE_CONFIG_H -I. -I. -I../.. -I..    -g -O2 -fno-rtti -fno-exceptions -Wall -W -c exec.cc
exec.cc: In function `int presetenv(const char*, const mystring&)':
exec.cc:29: `strlen' undeclared (first use this function)
exec.cc:29: (Each undeclared identifier is reported only once for each function
  it appears in.)
exec.cc:31: `strcpy' undeclared (first use this function)
make[3]: *** [exec.o] Error 1
make[3]: Leaving directory `/usr/src/vmailmgr-0.96.9/lib/misc'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/usr/src/vmailmgr-0.96.9/lib'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/usr/src/vmailmgr-0.96.9'
make: *** [all-recursive-am] Error 2


Hvad skal jeg gøre for at få installeret VMailMgr?