doxygen fig2dev \
chrpath \
libdw-dev libevent-dev libunwind8-dev \
+ linkchecker \
&& \
- pip3 install breathe javasphinx sphinx>=1.8.0b1 sphinx_rtd_theme
+ pip3 install breathe javasphinx 'sphinx>=1.8.0b1' sphinx_rtd_theme
\ No newline at end of file