Cygwin's default user interface will be the bash shell working inside the mintty terminal emulator.[25] The DLL also implements pseudo terminal (pty) units, and Cygwin ships with several terminal emulators which might be determined by them, which include rxvt/urxvt and xterm. The Variation of GCC that comes along with Cygwin https://acgwin07406.dailyblogzz.com/37742202/getting-my-acgwin-to-work