netfeed@bimbimbap: crystal> ./bin/crystal spec/std/array_spec.cr
Using compiled compiler at .build/crystal
/home/netfeed/git/crystal/.crystal/home/netfeed/git/crystal/spec/std/array_spec.cr/main.o: In function `__crystal_main':
main_module:(.text+0x561f): undefined reference to `GC_get_push_other_roots'
main_module:(.text+0x5685): undefined reference to `GC_set_push_other_roots'
main_module:(.text+0x568a): undefined reference to `co_thread_init'
/home/netfeed/git/crystal/.crystal/home/netfeed/git/crystal/spec/std/array_spec.cr/Fiber.o: In function `*Fiber#initialize<Fiber>:Fiber':
Fiber:(.text+0x193): undefined reference to `co_set_data'
/home/netfeed/git/crystal/.crystal/home/netfeed/git/crystal/spec/std/array_spec.cr/Fiber.o: In function `*Fiber#initialize<Fiber, &( -> Void)>:Fiber':
Fiber:(.text+0x333): undefined reference to `co_set_data'
/home/netfeed/git/crystal/.crystal/home/netfeed/git/crystal/spec/std/array_spec.cr/Fiber.o: In function `*Fiber::current:Fiber':
Fiber:(.text+0x62d): undefined reference to `co_get_data'
collect2: error: ld returned 1 exit status