It turns out that it does not work on Ubuntu 15.04.
(defconst calendar-bahai-month-name-array
["Bahá" "Jalál" "Jamál" "‘Aẓamat" "Núr" "Raḥmat" "Kalimát" "Kamál"
- "Asmá’" "‘Izzat" "Mas̲h̲íyyat" "‘Ilm" "Qudrat" "Qawl" "Masá’il"
- "S̲h̲araf" "Sulṭán" "Mulk" "‘Alá’"]
+ "Asmá’" "‘Izzat" "Mashíyyat" "‘Ilm" "Qudrat" "Qawl" "Masá’il"
+ "Sharaf" "Sulṭán" "Mulk" "‘Alá’"]
"Array of the month names in the Bahá'í calendar.")
(defconst calendar-bahai-epoch (calendar-absolute-from-gregorian '(3 21 1844))