Added target nlina64 nlina32 , nasm assembles 64 bit Forth.

Makefile

@@ -428,8 +428,9 @@ LINA64ZIP : $(RELEASELINA64) ;\
 releaseproof : ; for i in $(RELEASECONTENT); do  rcsdiff -w $$i ; done
 
 ci86.lina32.o : ci86.lina32.asm ; nasm $+ -felf -g -o $@ -l $(@:.o=.lst)
+ci86.lina64.o : ci86.lina64.asm ; nasm $+ -felf64 -g -o $@ -l $(@:.o=.lst)
 
-ci86.%.o : ci86.%.asm ; nasm $+ -felf -o $@ -l $(@:.o=.lst)
+ci86.%.o : ci86.%.asm ; nasm $+ -o $@ -l $(@:.o=.lst)
 
 # The tricky `link.script' has been dispensed with.
 # However, now we need _fini and _init in ciforth.c and
@@ -440,6 +441,9 @@ ciforthc : ciforth.o ci86.linux.o
 
 # Linux native forth by nasm. FIXME the linking doesn't work.
 nlina32 : ci86.lina32.o ; ld $+ -melf_i386 -N -o $@
+nlina64 : ci86.lina64.o ; \
+  export LDEMULATION=elf_x86_64 ;\
+  ld $+ -N -o $@
 
 # Linux native forth by gnu tools
 glina32 : ci86.lina32.s ; as --32 $+; ld a.out -melf_i386 -N -o $@

nasm.m4

@@ -44,7 +44,8 @@ _PC_({
 ; documentation of nasm.
 _BOOTED_({; See again the generic system manual for more information how to install
 ; booting versions.
-})})
+})
+})
 
 dnl Directives ignored by NASM.
 define({ASSUME},;)dnl Turn ASSUME into comment.
@@ -81,13 +82,15 @@ define({_BYTE_PTR},{BYTE $1})
 define({_CALL_FAR_INDIRECT},{CALL FAR [$1]})
 define({_FAR_ADDRESS},{[$1:$2]})
 define({_CELL_PTR},{ CELL_M4})dnl Make it specify SIZE only.
-define({_OFFSET})dnl Ignore this design error altogether.
+define({_OFFSET},)dnl Ignore this design error altogether.
+define({QUAD},{QWORD})
 
 dnl Handling large blocks of comment
 define({_COMMENT},{%if 0})
 define({_ENDCOMMENT},{%endif})
 define({SET_16_BIT_MODE},{BITS   16})
 define({SET_32_BIT_MODE},{BITS   32})
+define({SET_64_BIT_MODE},{BITS   64})
 define({_ALIGN},{ALIGN    M4_CELLWIDTH})
 define({DSS},{DB})
 dnl A nobits section takes no place in the object file.