$ latexdiff --v
Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in     m/\includeonly{ <-- HERE (.*?)}/ at /usr/bin/latexdiff line 1572.
Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in     m/(^(?:[^%n]|\%)*)\bibliography{ <-- HERE (.*?)}/ at /usr/bin/latexdiff line 1607.
Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in     m/(^(?:[^%n]|\%)*)\subfile{ <-- HERE (.*?)}/ at /usr/bin/latexdiff line 1622.
Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in     m/(?<!\)\{ <-- HERE / at /usr/bin/latexdiff line 2351.
Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in     m/\begin{ <-- HERE MATHMODE}((?:(.(?!(?<!\)&|\\))*)?)\end{MATHMODE}/ at   /usr/bin/latexdiff line 2676.
Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in     m/\begin{MATHMODE}((?:(.(?!(?<!\)&|\\))*)?)\end{ <-- HERE MATHMODE}/ at   /usr/bin/latexdiff line 2676.
Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in     m/\begin{ <-- HERE MATHMODE}(.*?)\end{MATHMODE}/ at /usr/bin/latexdiff line 2678.
Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in     m/\begin{MATHMODE}(.*?)\end{ <-- HERE MATHMODE}/ at /usr/bin/latexdiff line 2678.
Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in     m/\end{ <-- HERE SQUAREBRACKET}/ at /usr/bin/latexdiff line 2759.
Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in     m/\begin{ <-- HERE SQUAREBRACKET}/ at /usr/bin/latexdiff line 2760.
Option v is ambiguous (verbose, version, visible-label)
2 and only 2 non-option arguments required.  Write latexdiff -h to get help