Dear Maintainer,
this crash happens because this executable is expecting
at command line a parameter month and year.
Doing so produces a calendar at stdout in postscript format.
Kind regards,
Bernhard
(gdb) bt
#0 __GI_____strtol_l_internal (nptr=0x0, endptr=0x0, base=10, group=0, loc=0x7f3181dc04a0 <_nl_global_locale>) at ../stdlib/strtol_l.c:292
#1 0x00005629626651b4 in atoi (__nptr=<optimized out>) at /usr/include/stdlib.h:363
#2 main (argc=1, argv=0x7ffe5c59e508) at calendar.cpp:621
https://sources.debian.org/src/pluto-lunar/0.0~git20180825.e34c1d1-1/calendar.cpp/#L621