This is no longer linked to by 
make.1.elif.REL=11.0-CURRENT.diff.no_customise
as
20150616
make got removed, now replaced by bmake

*** 6.1-RELEASE/src/usr.bin/make/make.1	Sun Jan 22 17:33:46 2006
--- generic/src/usr.bin/make/make.1	Tue Jun 20 23:31:22 2006
***************
*** 1510,1515 ****
--- 1510,1546 ----
  Most of the more esoteric features of
  .Nm
  should probably be avoided for greater compatibility.
+ .Pp
+ The expansion of .elif uses everything up to end of line, & allows no
+ # comment delimeter as available to simpler .if & .else & .endif commands.
+ .br
+ This thus fails;
+ .in +2
+ .nf
+  .if defined(AA)         #{AA
+          @echo 11
+  .elif defined(BB)       #}{!AA{BB
+          @echo 22
+  .else                   #}{!BB
+          @echo 33
+  .endif                  #}}
+ .fi
+ .in -2
+ Whereas this works
+ .in +2
+ .nf
+  .if defined(AA)         #{AA
+          @echo 11
+  .else                   #}{!AA
+  .if defined(BB)         #{BB
+          @echo 22
+  .else                   #}{!BB
+          @echo 33
+  .endif                  #}
+  .endif                  #}
+ .fi
+ .in -2
+ .Pp
  .Sh SEE ALSO
  .Xr mkdep 1 ,
  .Xr make.conf 5