Flex (2.5.4a-11) in unstable does not produce g++-3.0 compliant C++
code. To compile LilyPond with gcc-3.0 you may do:
- CC=gcc-3.0 CXX=g++-3.0 ./configure
+
+ CC=gcc-3.0 CXX=g++-3.0 ./configure --enable-config=gcc-3.0
make conf=gcc-3.0 -C lily out-gcc-3.0/lexer.cc
patch -p1 < lexer-gcc-3.0.patch
make conf=gcc-3.0 -C lily