perl/solaris2.7 install difficulties

[p5pRT]

Migrated from rt.perl.org#920 (status was 'resolved')

Searchable as RT920$

[p5pRT]

From acj@sildynamics.com

# /usr/ccs/bin/make^
make​: Warning​: Both `makefile' and `Makefile' exist
`sh cflags libperl.a miniperlmain.o` miniperlmain.c
  CCCMD = cc -DPERL_CORE -c -O
"./perlvars.h", line 21​: invalid token​: ##
"./perlvars.h", line 21​: undefined or not a type​: PL_

many more lines like this.
Any pointers appreciated,

Andy