I am running 15.0-RELEASE-p4, deskutils/gsimplecal-2.5.2 installed from packages

% gdb /usr/local/bin/gsimplecal gsimplecal.core                               ~
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Reading symbols from /usr/local/bin/gsimplecal...
(No debugging symbols found in /usr/local/bin/gsimplecal)
[New LWP 100500]
Core was generated by `gsimplecal'.
Program terminated with signal SIGABRT, Aborted.
Sent by thr_kill() from pid 61201 and user 1000.
#0  0x00000008304969ea in thr_kill () from /lib/libsys.so.7
(gdb) bt
#0  0x00000008304969ea in thr_kill () at /lib/libsys.so.7
#1  0x0000000825391894 in raise () at /lib/libc.so.7
#2  0x00000008254436f9 in abort () at /lib/libc.so.7
#3  0x0000000824164fb8 in ??? () at /lib/libcxxrt.so.1
#4  0x00000008241630e9 in std::terminate() () at /lib/libcxxrt.so.1
#5  0x00000008241635d4 in ??? () at /lib/libcxxrt.so.1
#6  0x00000008241634e9 in __cxa_throw () at /lib/libcxxrt.so.1
#7  0x000000000020a469 in ??? ()
#8  0x0000000000208fe2 in ??? ()
#9  0x000000082536637f in __libc_start1 () at /lib/libc.so.7
#10 0x00000000002065e4 in ??? ()
(gdb)