Allegro 4 não é mais suportado. Allegro 5 é suportado no mais recente OSX.
Você não precisa de fblend, AASTR ou ALFONT com Allegro 5.
Além disso, Allegro 5 é uma API totalmente diferente da Allegro 4.

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Allegro 4 is no longer supported. Allegro 5 is supported on the latest OSX.
You do not need Fblend, AASTR or Alfont with Allegro 5.
In addition, Allegro 5 is a totally different API from Allegro 4.

Some useful links to follow :

https://brew.sh/

https://github.com/liballeg/allegro_wiki/wiki/Quickstart#installation

https://liballeg.org/a5docs/trunk/

You need to set the search directory for include files so that it will find <allegro5/allegro.h> properly. Usually they are in /usr/include or /usr/local/include and you include them with -I /usr/DIRECTORY

g++ -Wall -Wextra -g -I /usr/local/include -o prog.exe prog.cpp -lallegro_monolith-debug.dll 

https://github.com/liballeg/allegro_wiki/wiki/Installing-with-homebrew

It says allegro should be in /usr/local/include . (Note the leading /)

Okay, so you installed Allegro 5 using Homebrew?

And changed it to -I /usr/local/include?

The includes don't have any spaces.

#include <allegro5/allegro.h>

I don't know what else is wrong.

For help porting allegro 4 programs to allegro 5, see a4_aux.c and a4_aux.h in Allegro/demos/speed.

jamdesalles - Allegro 5 may not be supported on High Sierra, so you may need to downgrade to Allegro 4. I can't find an answer on this.

It would probably be good to invest in newer hardware for a Mac. 2010 is pretty old and won't be supported by many people.

Then why are you running High Sierra? 10.13

If High Sierra and your computer are both from 2017 then you should be able to install Homebrew, and then Allegro 5, like I said before.

You have to link to the native dialog addon. -lallegro_dialog

Estranho como ? Não te passei o código fonte !
usei sua indicação , o resultado :MacBook-Air-de-User:bicho maphiaimac$ make
gcc -o bicho.o -c -g -Wall -Wextra `pkg-config --cflags allegro allego_main allegro_font allego_dialog` bicho.c -I /usr/local/include
Package allegro was not found in the pkg-config search path.
Perhaps you should add the directory containing `allegro.pc'
to the PKG_CONFIG_PATH environment variable
No package 'allegro' found
Package allego_main was not found in the pkg-config search path.
Perhaps you should add the directory containing `allego_main.pc'
to the PKG_CONFIG_PATH environment variable
No package 'allego_main' found
Package allegro_font was not found in the pkg-config search path.
Perhaps you should add the directory containing `allegro_font.pc'
to the PKG_CONFIG_PATH environment variable
No package 'allegro_font' found
Package allego_dialog was not found in the pkg-config search path.
Perhaps you should add the directory containing `allego_dialog.pc'
to the PKG_CONFIG_PATH environment variable
No package 'allego_dialog' found
bicho.c:65:14: warning: unused parameter 'argc' [-Wunused-parameter]
int main(int argc, char *argv[])
^
bicho.c:65:26: warning: unused parameter 'argv' [-Wunused-parameter]
int main(int argc, char *argv[])
^
2 warnings generated.
gcc -o bicho bicho.o -Wl,-rpath,/usr/local/lib -lallegro -lallegro_font -lallegro_main -lncurses -lmysqlclient
Undefined symbols for architecture x86_64:
"_al_show_native_message_box", referenced from:
_init in bicho.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [bicho] Error 1

Não ! este programa foi abandonado e estava usando o Allegro 4 ! Estou fazendo tudo outra vez em outro com o Allegro 5 ! Veja o resultado do Makefile que você sugeriu ! ele não encontra as bibliotecas ! Acho que não coloquei o nome correto , tentei usando todas com o -5 para identificar o Allegro5 e também deu o mesmo erro !
"Veja o resultado do Makefile que foi sugerido por voce" tem um tradutor ou corretor que altera o que eu escrevo, muito estranho !
Veja o resultado agora ! Corrigi o Makefile com o nome das bibliotecas e deu erro no x86_64 outra vez ! :gcc -o bicho bicho.o -Wl,-rpath,/usr/local/lib -lallegro -lallegro_font -lallegro_main -lncurses -lmysqlclient
Undefined symbols for architecture x86_64:
"_al_show_native_message_box", referenced from:
_init in bicho.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [bicho] Error 1

Veja o Makefile completo :

CC = gcc
CLANG = -v
CFLAGS = -g -Wall -Wextra `pkg-config --cflags lallegro lallego_main lallegro_font lallego_dialog`
OBJECTS = bicho.o
INCFLAGS = -I /usr/local/include
LDFLAGS = -Wl,-rpath,/usr/local/lib
LIBS = -lallegro -lallegro_font -lallegro_main -lncurses -lmysqlclient

all: bicho

bicho: $(OBJECTS)
$(CC) -o bicho $(OBJECTS) $(LDFLAGS) $(LIBS)

.SUFFIXES:
.SUFFIXES: .c .cc .C .cpp .o

.c.o :
$(CC) -o $@ -c $(CFLAGS) $< $(INCFLAGS)

count:
wc *.c *.cc *.C *.cpp *.h *.hpp

clean:
rm -f *.o

.PHONY: all
.PHONY: count
.PHONY: clean

Por favor me da uma luz !!!!! To parado e meu cliente me cobrando muito ! diuturnamente ! continua o problema do x86_64 ! :

MacBook-Air-de-User:bicho maphiaimac$ make
gcc -o bicho bicho.o -Wl,-rpath,/usr/local/lib -lallegro -lallegro_font -lallegro_main -lncurses -lmysqlclient
Undefined symbols for architecture x86_64:
"_al_show_native_message_box", referenced from:
_init in bicho.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [bicho] Error 1
Olha consegui evoluir ! já não da mais problema com x86-64 agora o problema é outro :
Segmentation fault: 11

nos testes que fiz isto acontece no :

video = al_create_display (1280, 1024);
ALLEGRO_DISPLAY *video = NULL;

HELP !!!!!!!

Por favor alguém me ajude !!!

A coisa evolui mas sempre acontece algo novo ! o Allegro 5 é muito diferente ! Agora :
bicho.c:89:32: error: expected parameter declarator
ALLEGRO_DISPLAY *video(1280,1024);
^
bicho.c:89:32: error: expected ')'
bicho.c:89:31: note: to match this '('
ALLEGRO_DISPLAY *video(1280,1024);

Segue o fonte !

#include<allegro5/allegro_font.h>
#include<allegro5/allegro_native_dialog.h>
#include<allegro5/allegro_image.h>
#include<allegro5/allegro_opengl.h>
#include<allegro5/blender.h>
#include<allegro5/allegro_audio.h>
#include<allegro5/drawing.h>
#include<allegro5/color.h>
#include<allegro5/bitmap.h>
#include<allegro5/bitmap_draw.h>
#include<allegro5/keyboard.h>
#include<allegro5/mouse.h>
#include<allegro5/keycodes.h>
#include<allegro5/display.h>
#include<allegro5/error.h>
#include<allegro5/events.h>
#include<time.h>
#include<ctype.h>
#include<errno.h>
#include<wchar.h>
#include<stdlib.h>
#include<string.h>
#include<ncurses.h>

#define FUNDO 1

void init(void); // inicia Allegro
void grid(void); // monta tela de apresentação
void shut(void); // shutdow do bicho
void faz_aposta(void); // faz aposta
void registra_aposta(void); // registra no banco aposta
void send_aposta(void); // envia aosta por e-mal pi umprime
void customer_write(void); // cadastra no banco cliente (nome ficticio) - leva banco, ag e conta

typedef struct ALLEGRO_DISPLAY *video;

char *dsp = ".." ;
// int *video = NULL;

int main(int argc, char *argv[])
{
system("clear");
init();
grid();
return(0);
}

void init (void)
{
printf("Criando video /n");

ALLEGRO_DISPLAY *video(1280,1024);

// ALLEGRO_DISPLAY *video = NULL;

printf("Criei video /n");

if(!al_init())
{
al_show_native_message_box(NULL, "Warning", "Error : ", "Allegro
wrong Initializtion",NULL,ALLEGRO_MESSAGEBOX_ERROR);
return ;
}

// video = al_create_display (1280, 1024);

if (!*video)
{
al_show_native_message_box(NULL, "Warning", "Error : ", "Video not
created",NULL,ALLEGRO_MESSAGEBOX_ERROR);
return ;
}

al_show_native_message_box(NULL, "Message", "Ok ! : ",
"Initialized",NULL,ALLEGRO_MESSAGEBOX_WARN);
al_rest(10);

return ;
}

Lembrar que existe um tradutor que altera o conteúdo de algumas linhas, por exemplo não é retorno e sim return e outras também o código esta certo , porem este tradutor não sei por que altera ! ^