Problems building with gcc 3.2.3/flex 2.5.4a

[JM Pim]

I've been trying to build Lilypond 2.5.3 with gcc 3.2.3 and flex 2.5.4a

I've seen the warning about using flex 2.5.4a with gcc-3.x in INSTALL.html 
and have tried to use it but with no success.

make all exits with

... flex -Cfe -p -p -oout/lexer.cc lexer.ll "lexer.ll", line 628: warning, 
-s option given but default rule can be matched rm -f ./out/lexer.dep; 
DEPENDENCIES_OUTPUT="./out/lexer.dep ./out/lexer.o" g++ -c -DHAVE_CONFIG_H 
-DSTRING_UTILS_INLINED -Iinclude -I./out -I../flower/include 
-I../flower/./out -I../flower/include -O2 -finline-functions -g -pipe 
-I/usr/share/texmf/include/ -I/usr/include/python2.3 -O2 -finline-functions 
-g -pipe -I/usr/share/texmf/include/ -I/usr/include/python2.3 -W -Wall 
-Wconversion -o out/lexer.o out/lexer.cc In file included from 
/usr/include/c++/3.2.3/backward/iostream.h:31,
                from /usr/local/include/FlexLexer.h:47,
                from out/lexer.cc:242: 
/usr/include/c++/3.2.3/backward/backward_warning.h:32:2: warning: #warning 
This file includes at least one deprecated or antiquated header. Please 
consider using one of the 32 headers found in section 17.4.1.2 of the C++ 
standard. Examples include substituting the <X> header for the <X.h> header 
for C++ includes, or <sstream> instead of the deprecated header 
<strstream.h>. To disable this warning use -Wno-deprecated. In file 
included from /usr/local/include/FlexLexer.h:47,
                from out/lexer.cc:242:
/usr/include/c++/3.2.3/backward/iostream.h:36: using declaration `istream'
  introduced ambiguous type `istream' out/lexer.cc: In member function 
`virtual int Lily_lexer::yylex()': out/lexer.cc:4496: cannot convert 
`std::istream*' to `istream*' in assignment out/lexer.cc: In member 
function `void yyFlexLexer::yy_load_buffer_state()': out/lexer.cc:5019: 
cannot convert `istream*' to `std::istream*' in assignment out/lexer.cc: In 
member function `void
  yyFlexLexer::yy_init_buffer(yy_buffer_state*, std::istream*)': 
out/lexer.cc:5070: cannot convert `std::istream*' to `istream*' in 
assignment /usr/include/c++/3.2.3/bits/locale_facets.h: At top level: 
out/lexer.cc:3482: warning: `int yy_start_stack_ptr' defined but not used 
out/lexer.cc:3483: warning: `int yy_start_stack_depth' defined but not used 
out/lexer.cc:3484: warning: `int*yy_start_stack' defined but not used 
out/lexer.cc:3486: warning: `void yy_push_state(int)' declared `static' but
  never defined out/lexer.cc:3489: warning: `void yy_pop_state()' declared 
`static' but never
  defined
out/lexer.cc:3492: warning: `int yy_top_state()' declared `static' but never
  defined make[1]: *** [out/lexer.o] Error 1 rm out/lexer.cc make[1]: 
Leaving directory 
`/home/mark/lilypond/lilypond-2004-12-03/lilypond-2.5.3/lily' make: *** 
[all] Error 2

--------------------------------

Any ideas? I've spent quite a while hacking around in lily/out/lexer.cc to 
try to get it to compile.

The annoying thing is it worked a couple of days ago, but then fell down 
later because I only had makeinfo 4.5 so the Doc build failed. All I did 
was update texinfo to 4.7 and reinstall flex 2.5.4a from the GNU source 
(slackware 9.1 comes with flex 2.5.4a anyway).

AHHHH!

Any help would be great!

Mark