allegro.cpp: In function ‘int main()’:
allegro.cpp:8: warning: ‘textout_centre’ is deprecated (declared at /usr/include/allegro/alcompat.h:160)
allegro.cpp:8: warning: ‘textout_centre’ is deprecated (declared at /usr/include/allegro/alcompat.h:160)
/tmp/ccnqKgX3.o: In function `install_allegro':
allegro.cpp:(.text+0x10): undefined reference to `_get_allegro_version'
allegro.cpp:(.text+0x28): undefined reference to `get_config_text'
allegro.cpp:(.text+0x2d): undefined reference to `allegro_error'
allegro.cpp:(.text+0x41): undefined reference to `ustrzcpy'
allegro.cpp:(.text+0x63): undefined reference to `_install_allegro'
/tmp/ccnqKgX3.o: In function `textout_centre':
allegro.cpp:(.text+0x80): undefined reference to `_textmode'
allegro.cpp:(.text+0xb2): undefined reference to `textout_centre_ex'
/tmp/ccnqKgX3.o: In function `main':
allegro.cpp:(.text+0xe0): undefined reference to `install_keyboard'
allegro.cpp:(.text+0x10c): undefined reference to `set_gfx_mode'
allegro.cpp:(.text+0x112): undefined reference to `font'
allegro.cpp:(.text+0x117): undefined reference to `screen'
allegro.cpp:(.text+0x13d): undefined reference to `readkey'
collect2: ld returned 1 exit status