What's going on with multiple defintion of .refptr._CRT_MT?

[sotrdg sotrdg]

.dll.tmp ./shlib/libgcc_s_seh-1.dll && mv ./shlib/libgcc_s.a.tmp ./shlib/libgcc_s.a
/home/cqwrteur/toolchains/gnu/x86_64-linux-gnu/x86_64-w64-mingw32/x86_64-w64-mingw32/bin/ld: /home/cqwrteur/toolchains/gnu/x86_64-linux-gnu/x86_64-w64-mingw32/x86_64-w64-mingw32/lib/libmingw32.a(lib64_libmingw32_a-tlssup.o):tlssup.c:(.rdata$.refptr._CRT_MT+0x0): multiple definition of `.refptr._CRT_MT'; gthr-win32-thread_s.o:gthr-win32-thread.c:(.rdata$.refptr._CRT_MT[.refptr._CRT_MT]+0x0): first defined here
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:1009: libgcc_s.dll] Error 1
make[2]: Leaving directory '/home/cqwrteur/toolchains_build/gcc_build/x86_64-linux-gnu/x86_64-w64-mingw32/gcc/x86_64-w64-mingw32/libgcc'
make[1]: *** [Makefile:15823: all-target-libgcc] Error 2
make[1]: Leaving directory '/home/cqwrteur/toolchains_build/gcc_build/x86_64-linux-gnu/x86_64-w64-mingw32/gcc'
make: *** [Makefile:1069: all] Error 2