Building Nmap on older platforms - liblua issues

["Greg Earle" <earle () isolar DynDNS ORG>]

Hello everyone, long-time listener, first time caller ...

Sorry for the long post.

I'm trying to build 7.80 on an ancient hardware/OS/compiler platform 
(frozen CM configuration - don't ask).

"liblua" is giving me fits.  First thing I ran into:

==
Compiling liblua
gmake[1]: Entering directory '/src/networking/nmap-7.80/liblua'
gcc -O2 -Wall -W -DLUA_COMPAT_5_2  -g -O2 -Wall   -DLUA_USE_POSIX 
-DLUA_USE_DLOPEN -I./liblinear -I./liblua -I./libdnet-stripped/include 
-I./libssh2/include -I./libz -I/usr/local/include -I/usr/local/include 
-I./nbase -I./nsock/include -DHAVE_CONFIG_H 
-DNMAP_PLATFORM=\"********************\" 
-DNMAPDATADIR=\"/usr/local/share/nmap\" -D_FORTIFY_SOURCE=2  -c -o 
lapi.o lapi.c
In file included from lua.h:16,
                 from lapi.c:16:
luaconf.h:581:2: #error "Compiler does not support 'long long'.  Use 
option '-DLUA_32BITS'   or '-DLUA_C89_NUMBERS' (see file 'luaconf.h' for 
details)"
==

I can add "-DLUA_C89_NUMBERS" into the mix, but then it gags on 
"log2()", which doesn't come in libm on this OS - it's available in a 
different library.

(I don't want to use "-DLUA_USE_C89" because the compiler supports C99 
and there's no need to disable C99 features when the function is 
available, just not in a standard place.)

Then I noticed something.

In the top-level Makefile, instead of doing "cd $(LIBLUADIR) && $(MAKE) 
<platform>"", it does this:

==
        @echo Compiling liblua; cd $(LIBLUADIR) && $(MAKE) liblua.a 
CC="$(CC)" MYCFLAGS="$(CFLAGS) -DLUA_USE_POSIX -DLUA_USE_DLOPEN"
==

If I manually set MYCFLAGS, MYLDFLAGS and MYLIBS in liblua/Makefile, I 
can do a "make <platform>" down in liblua and it builds cleanly.

But because of that top-level Makefile line, all of my 
MYCFLAGS/MYLDFLAGS/MYLIBS settings get ignored and it fails.  So my 
question is:

How can I tell the build how to find my alternate math library if it's 
going to override the mechanism liblua provides to do just that?

-------

Oh, while I'm here - "libz/configure" and "liblua/Makefile" both contain 
references to "-Wextra", which isn't supported on older GCC versions.  
"-W" seems to be the same thing and it's maintained for compatibility; 
could those two instances be changed to use that?

==
[/src/networking/nmap-7.80] $ grep Wextra libz/configure.dist 
liblua/Makefile
libz/configure:      CFLAGS="${CFLAGS} -Wall -Wextra -Wcast-qual 
-pedantic -DZLIB_CONST"
libz/configure:      CFLAGS="${CFLAGS} -Wall -Wextra -pedantic"
==

Thanks in advance,

                - Greg
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