Version:           1.1.1 (using KDE KDE 3.1)
Installed from:    Slackware Packages
Compiler:          gcc version 3.2.2 
OS:          Linux

"I'm having problems compiling tokenizer.cc" ...
I did what the FAQ said, but it stil doesn't compile.

I'm using slackware 9.0.0 (from the iso) with flex version 2.5.4 (I tried replacing that with 2.5.27 - with almost the same results). Here are the outputs from make, in order (./configure was run before make):

Using flex 2.5.4
marcus@madonna:~/linux/src/umbrello-1.1.1$ make
make  all-recursive
make[1]: Entering directory `/home/marcus/linux/src/umbrello-1.1.1'
Making all in uml
make[2]: Entering directory `/home/marcus/linux/src/umbrello-1.1.1/uml'
Making all in classparser
make[3]: Entering directory `/home/marcus/linux/src/umbrello-1.1.1/uml/classparser'
source='tokenizer.cc' object='tokenizer.o' libtool=no \
depfile='.deps/tokenizer.Po' tmpdepfile='.deps/tokenizer.TPo' \
depmode=gcc3 /bin/sh ../../admin/depcomp \
g++ -DHAVE_CONFIG_H -I. -I. -I../.. -I/opt/kde/include -I/usr/lib/qt-3.1.2/include -I/usr/X11R6/include   -DQT_THREAD_SUPPORT  -D_REENTRANT  -O2 -O0 -fno-exceptions -fno-check-new  -c -o tokenizer.o `test -f 'tokenizer.cc' || echo './'`tokenizer.cc
In file included from /usr/include/c++/3.2.2/backward/iostream.h:31,
                 from /usr/include/FlexLexer.h:47,
                 from tokenizer.cc:238:
/usr/include/c++/3.2.2/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/include/FlexLexer.h:47,
                 from tokenizer.cc:238:
/usr/include/c++/3.2.2/backward/iostream.h:36: using declaration `istream'
   introduced ambiguous type `istream'
tokenizer.cc: In member function `virtual int yyFlexLexer::yylex()':
tokenizer.cc:1311: cannot convert `std::istream*' to `istream*' in assignment
tokenizer.cc: In member function `void yyFlexLexer::yy_load_buffer_state()':
tokenizer.cc:1842: cannot convert `istream*' to `std::istream*' in assignment
tokenizer.cc: In member function `void
   yyFlexLexer::yy_init_buffer(yy_buffer_state*, std::istream*)':
tokenizer.cc:1893: cannot convert `std::istream*' to `istream*' in assignment
make[3]: *** [tokenizer.o] Error 1
make[3]: Leaving directory `/home/marcus/linux/src/umbrello-1.1.1/uml/classparser'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/marcus/linux/src/umbrello-1.1.1/uml'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/marcus/linux/src/umbrello-1.1.1'
make: *** [all] Error 2


Using flex 2.5.27
root@madonna:/home/marcus/linux/src/umbrello-1.1.1# make
cd . && /bin/sh ./config.status config.h
config.status: creating config.h
config.status: config.h is unchanged
make  all-recursive
make[1]: Entering directory `/home/marcus/linux/src/umbrello-1.1.1'
Making all in uml
make[2]: Entering directory `/home/marcus/linux/src/umbrello-1.1.1/uml'
Making all in classparser
make[3]: Entering directory `/home/marcus/linux/src/umbrello-1.1.1/uml/classparser'
source='tokenizer.cc' object='tokenizer.o' libtool=no \
depfile='.deps/tokenizer.Po' tmpdepfile='.deps/tokenizer.TPo' \
depmode=gcc3 /bin/sh ../../admin/depcomp \
g++ -DHAVE_CONFIG_H -I. -I. -I../.. -I/opt/kde/include -I/usr/lib/qt-3.1.2/include -I.   -DQT_THREAD_SUPPORT  -D_REENTRANT  -O2 -O0 -fno-exceptions -fno-check-new  -c -o tokenizer.o `test -f 'tokenizer.cc' || echo './'`tokenizer.cc
tokenizer.cc: In member function `virtual int yyFlexLexer::yylex()':
tokenizer.cc:846: `cin' undeclared (first use this function)
tokenizer.cc:846: (Each undeclared identifier is reported only once for each
   function it appears in.)
tokenizer.cc:849: `cout' undeclared (first use this function)
tokenizer.cc:1311: cannot convert `std::istream*' to `istream*' in assignment
tokenizer.cc: At global scope:
tokenizer.cc:1419: type specifier omitted for parameter `ostream'
tokenizer.cc:1419: parse error before `*' token
tokenizer.cc:1422: ISO C++ forbids declaration of `yyout' with no type
tokenizer.cc:1422: `arg_yyout' was not declared in this scope
tokenizer.cc:1423: ISO C++ forbids declaration of `yy_c_buf_p' with no type
tokenizer.cc:1424: ISO C++ forbids declaration of `yy_init' with no type
tokenizer.cc:1425: ISO C++ forbids declaration of `yy_start' with no type
tokenizer.cc:1426: ISO C++ forbids declaration of `yy_flex_debug' with no type
tokenizer.cc:1427: ISO C++ forbids declaration of `yylineno' with no type
tokenizer.cc:1429: ISO C++ forbids declaration of `yy_did_buffer_switch_on_eof'
   with no type
tokenizer.cc:1431: ISO C++ forbids declaration of `yy_looking_for_trail_begin'
   with no type
tokenizer.cc:1432: ISO C++ forbids declaration of `yy_more_flag' with no type
tokenizer.cc:1433: ISO C++ forbids declaration of `yy_more_len' with no type
tokenizer.cc:1434: ISO C++ forbids declaration of `yy_more_offset' with no type
tokenizer.cc:1434: invalid use of member `yyFlexLexer::yy_prev_more_offset'
tokenizer.cc:1436: ISO C++ forbids declaration of `yy_start_stack_ptr' with no
   type
tokenizer.cc:1436: invalid use of member `yyFlexLexer::yy_start_stack_depth'
tokenizer.cc:1437: ISO C++ forbids declaration of `yy_start_stack' with no type
tokenizer.cc:1439: ISO C++ forbids declaration of `yy_current_buffer' with no
   type
tokenizer.cc:1442: ISO C++ forbids declaration of `yy_state_buf' with no type
tokenizer.cc:1442: invalid conversion from `yy_state_type*' to `int'
tokenizer.cc:1446: parse error before `}' token
tokenizer.cc:1454: type specifier omitted for parameter `ostream'
tokenizer.cc:1454: parse error before `*' token
tokenizer.cc:1455: prototype for `void yyFlexLexer::switch_streams(...)' does
   not match any in class `yyFlexLexer'
/usr/local/include/FlexLexer.h:126: candidate is: virtual void
   yyFlexLexer::switch_streams(std::istream*, std::ostream*)
tokenizer.cc: In member function `void yyFlexLexer::switch_streams(...)':
tokenizer.cc:1456: `new_in' undeclared (first use this function)
tokenizer.cc:1462: `new_out' undeclared (first use this function)
tokenizer.cc: At global scope:
tokenizer.cc:1804: prototype for `void yyFlexLexer::yyrestart(istream*)' does
   not match any in class `yyFlexLexer'
/usr/local/include/FlexLexer.h:123: candidate is: virtual void
   yyFlexLexer::yyrestart(std::istream*)
tokenizer.cc: In member function `void yyFlexLexer::yyrestart(istream*)':
tokenizer.cc:1808: no matching function for call to `yyFlexLexer::
   yy_init_buffer(yy_buffer_state*&, istream*&)'
/usr/local/include/FlexLexer.h:137: candidates are: void
   yyFlexLexer::yy_init_buffer(yy_buffer_state*, std::istream*)
tokenizer.cc: In member function `void yyFlexLexer::yy_load_buffer_state()':
tokenizer.cc:1842: cannot convert `istream*' to `std::istream*' in assignment
tokenizer.cc: At global scope:
tokenizer.cc:1848: prototype for `yy_buffer_state*
   yyFlexLexer::yy_create_buffer(istream*, int)' does not match any in class `
   yyFlexLexer'
/usr/local/include/FlexLexer.h:121: candidate is: virtual yy_buffer_state*
   yyFlexLexer::yy_create_buffer(std::istream*, int)
tokenizer.cc: In member function `yy_buffer_state*
   yyFlexLexer::yy_create_buffer(istream*, int)':
tokenizer.cc:1866: no matching function for call to `yyFlexLexer::
   yy_init_buffer(yy_buffer_state*&, istream*&)'
/usr/local/include/FlexLexer.h:137: candidates are: void
   yyFlexLexer::yy_init_buffer(yy_buffer_state*, std::istream*)
tokenizer.cc: At global scope:
tokenizer.cc:1890: prototype for `void
   yyFlexLexer::yy_init_buffer(yy_buffer_state*, istream*)' does not match any
   in class `yyFlexLexer'
/usr/local/include/FlexLexer.h:137: candidate is: void
   yyFlexLexer::yy_init_buffer(yy_buffer_state*, std::istream*)
tokenizer.cc: In member function `virtual void yyFlexLexer::LexerError(const
   char*)':
tokenizer.cc:1990: `cerr' undeclared (first use this function)
make[3]: *** [tokenizer.o] Error 1
make[3]: Leaving directory `/home/marcus/linux/src/umbrello-1.1.1/uml/classparser'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/marcus/linux/src/umbrello-1.1.1/uml'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/marcus/linux/src/umbrello-1.1.1'
make: *** [all] Error 2
root@madonna:/home/marcus/linux/src/umbrello-1.1.1#