I'm trying to install Xmail (OS mail server) on a virtual private server. When trying to build the executables, I run into the following problem:

# make -f Makefile.lnx
g++ -I. -D__UNIX__ -D__LINUX__ -D_REENTRANT=1 -D_THREAD_SAFE=1 -DHAS_SYSMACHINE -D_GNU_SOURCE -D_LARGEFILE64_SOURCE -D_POSIX_PTHREAD_SEMANTICS -DSYS_HAS_SENDFILE -O2 -c MkMachDep.cpp
make: g++: Command not found
make: *** [MkMachDep.o] Error 127

I can make heads or tails of this error message. Anyone have any ideas? Thanks in advance for your help.