Think this is completely out of date

.Df
.TB "Variables for \fImake world\fP\|"
.TS
tab(#) ;
 lfCWp9 | lw57 .
\fRVariable#Function
_
ALLLANG#T{
build documentation for all languages, where available.  See
\fIshare/doc/Makefile\fP\| for more details.
T}
CLOBBER#T{
remove 
.Directory /usr/include .
T}
.sp .4v
MAKE_EBONES#build eBones (KerberosIV)
.sp .4v
NOCLEAN#T{
Do not clean out the old build tree.  This can save on build time, but may
introduce subtle problems.
T}
.sp .4v
NOCLEANDIR#run \f(CWmake clean\fP instead of \f(CWmake cleandir\fP
.sp .4v
NOCRYPT#don't build  crypt versions
.sp .4v
NOGAMES#T{
Don't rebuild the games.
T}
.sp .4v
NOINFO#don't make or install info files
.sp .4v
NOLIBC_R#don't build \fIlibc_r\fP.
.sp .4v
NOLKM#don't build loadable kernel modules
.sp .4v
NOOBJDIR#don't run \f(CWmake obj\fP
.sp .4v
NOPROFILE#T{
Don't build the profiling libraries.  If you're not doing any development
involving profiling, this can save a considerable amount of time and space.
T}
.sp .4v
NOSECURE#T{
Don't build the export-restricted modules.  If you haven't downloaded the
source for these, then you won't want to try to build them.  This is a good
option to use if you are not in the USA.
T}
.sp .4v
NOSHARE#T{
Don't rebuild 
.Directory /usr/share .  
This can save some time, and if
.Directory /usr/share
(which contains manpages, data files and examples) hasn't changed much, it won't
cause you any trouble.
T}
.TE
.Tn build-variables
.sp 1.5v
.DE
