Here I have same issue on MSYS2+MinGW-W64.
mingw-w64-gdb cannot trace error type while new Fl_Simple_Terminal pointer allocated by new Fl_Window, it occurs SIGSEGV.
Just uni_test successfully being tested but actually not works on complex project.

Here some backtrace on gdb

Thread 1 received signal SIGSEGV, Segmentation fault.
0x00007ff648ed242d in ?? ()
(gdb) bt
#0  0x00007ff648ed242d in ?? ()
#1  0x00007ff648ed2432 in ?? ()
#2  0x00007ff648ed2432 in ?? ()
#3  0x00007ff648ed2432 in ?? ()
#4  0x00007ff648ed2432 in ?? ()
#5  0x00007ff648ed2432 in ?? ()
#6  0x00007ff648ed2432 in ?? ()
#7  0x00007ff648ed2432 in ?? ()
#8  0x00007ff648ed2432 in ?? ()
#9  0x00007ff648ed2432 in ?? ()
#10 0x00007ff648ed2432 in ?? ()
#11 0x00007ff648ed2432 in ?? ()
#12 0x00007ff648ed2432 in ?? ()
#13 0x00007ff648ed2432 in ?? ()
#14 0x00007ff648ed2432 in ?? ()
#15 0x00007ff648ed2432 in ?? ()
#16 0x00007ff648ed2432 in ?? ()
#17 0x00007ff648ed2432 in ?? ()
#18 0x00007ff648ed2432 in ?? ()
#19 0x00007ff648ed2432 in ?? ()
#20 0x00007ff648ed2432 in ?? ()
#21 0x00007ff648ed2432 in ?? ()
#22 0x00007ff648ed2432 in ?? ()
#23 0x00007ff648ed2432 in ?? ()
#24 0x00007ff648ed2432 in ?? ()
#25 0x00007ff648ed2432 in ?? ()
#26 0x00007ff648ed2432 in ?? ()
#27 0x00007ff648ed2432 in ?? ()
#28 0x00007ff648ed2432 in ?? ()
#29 0x00007ff648ed2432 in ?? ()
#30 0x00007ff648ed2432 in ?? ()
#31 0x00007ff648ed2432 in ?? ()
#32 0x00007ff648ed2432 in ?? ()
#33 0x00007ff648ed2432 in ?? ()
#34 0x00007ff648ed2432 in ?? ()
#35 0x00007ff648ed2432 in ?? ()
#36 0x00007ff648ed2432 in ?? ()
#37 0x00007ff648ed2432 in ?? ()
#38 0x00007ff648ed2432 in ?? ()
#39 0x00007ff648ed2432 in ?? ()
#40 0x00007ff648ed2432 in ?? ()
#41 0x00007ff648ed2432 in ?? ()
#42 0x00007ff648ed2432 in ?? ()
#43 0x00007ff648ed2432 in ?? ()
#44 0x00007ff648ed2432 in ?? ()
#45 0x00007ff648ed2432 in ?? ()
#46 0x00007ff648ed2432 in ?? ()
#47 0x00007ff648ed2432 in ?? ()
#48 0x00007ff648ed2432 in ?? ()
#49 0x00007ff648ed2432 in ?? ()
#50 0x00007ff648ed2432 in ?? ()
#51 0x00007ff648ed2432 in ?? ()
#52 0x00007ff648ed2432 in ?? ()
#53 0x00007ff648ed2432 in ?? ()
#54 0x00007ff648ed2432 in ?? ()
#55 0x00007ff648ed2432 in ?? ()
#56 0x00007ff648ed2432 in ?? ()
#57 0x00007ff648ed2432 in ?? ()
#58 0x00007ff648ed2432 in ?? ()
#59 0x00007ff648ed2432 in ?? ()
#60 0x00007ff648ed2432 in ?? ()
#61 0x00007ff648ed2432 in ?? ()
#62 0x00007ff648ed2432 in ?? ()
#63 0x00007ff648ed2432 in ?? ()
.... ( repeats same ) ....
#1872 0x00007ff648ed2432 in ?? ()
#1873 0x00007ff648ed2432 in ?? ()
#1874 0x00007ff648ed2432 in ?? ()
#1875 0x00007ff648ed2432 in ?? ()
#1876 0x00007ff648ed2432 in ?? ()
#1877 0x00007ff648ed2432 in ?? ()
#1878 0x00007ff648ed2432 in ?? ()
#1879 0x00007ff648ed2432 in ?? ()
#1880 0x00007ff648ed2432 in ?? ()
#1881 0x00007ff648ed2432 in ?? ()
#1882 0x00007ff648ed26b3 in ?? ()
#1883 0x00007ff648ed2298 in ?? ()
#1884 0x00007ff648ed8fd6 in ?? ()
#1885 0x00007ff648edb0fd in ?? ()
#1886 0x00007ff648f844db in ?? ()
#1887 0x00007ff648fa69f7 in ?? ()
#1888 0x00007ff648fb8f50 in ?? ()
#1889 0x00007ff648fc8535 in ?? ()
#1890 0x00007ff648ed34df in ?? ()
#1891 0x00007ff648ed169d in ?? ()
#1892 0x00007ff648ec13ae in ?? ()
#1893 0x00007ff648ec14c6 in ?? ()
#1894 0x00007ffa46d37034 in KERNEL32!BaseThreadInitThunk ()
   from /c/WINDOWS/System32/KERNEL32.DLL
#1895 0x00007ffa47122651 in ntdll!RtlUserThreadStart ()
   from /c/WINDOWS/SYSTEM32/ntdll.dll
#1896 0x0000000000000000 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

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