cannot build main.dsp with Faust 0.9.90 (or 2.5.x)

[rekado]

With Faust 0.9.90 main.dsp cannot be compiled to main.cpp.

I used to use this command to compile main.cpp with Faust 0.9.67:

faust -i -a lv2synth.cpp -o main.cpp main.dsp

Faust 0.9.90 no longer provides lv2synth.cpp; it provides lv2.cpp or lv2ui.cpp, but when using either of these architecture files Faust complains about redefined symbols:

filter.lib:1904: ERROR: redefinition of symbols are not allowed : BoxIdent[levelfilter] is already defined in file "filter.lib" line 1904 
filter.lib:1912: WARNING: equivalent re-definitions of BoxIdent[levelfilterN]
filter.lib:933: WARNING: equivalent re-definitions of BoxIdent[apnl]
filter.lib:434: WARNING: equivalent re-definitions of BoxIdent[TF2]
effect.lib:22: WARNING: equivalent re-definitions of BoxIdent[log2]
music.lib:52: ERROR: redefinition of symbols are not allowed : BoxIdent[frac] is already defined in file "music.lib" line 52 
music.lib:252: ERROR: redefinition of symbols are not allowed : BoxIdent[decimal] is already defined in file "music.lib" line 252 
music.lib:478: WARNING: equivalent re-definitions of BoxIdent[chebychev]
music.lib:492: WARNING: equivalent re-definitions of BoxIdent[chebychevpoly]
oscillator.lib:231: WARNING: equivalent re-definitions of BoxIdent[diffn]

AIUI music.lib should no longer be used and all other libraries should be referenced via library("name") instead of import("name").