texvc output format is like that:
    +%5		ok, but not html or mathml
    c%5%h	ok, conservative html, no mathml
    m%5%h	ok, moderate html, no mathml
    l%5%h	ok, liberal html, no mathml
    C%5%h\0%m	ok, conservative html, with mathml
    M%5%h\0%m	ok, moderate html, with mathml
    L%5%h\0%m	ok, liberal html, with mathml
    X%5%m	ok, no html, with mathml
    S		syntax error
    E		lexing error
    F%s		unknown function %s
    -		other error

\0 - null character
%5 - md5, 32 hex characters
%h - html code, without \0 characters
%m - mathml code, without \0 characters



(GNU make is required to compile; if 'make' fails, try 'gmake'.)