diff -ur alex4src/src/bullet.c alex4src.nre/src/bullet.c

--- alex4src/src/bullet.c	2003-07-26 12:53:52.000000000 +0200

+++ alex4src.nre/src/bullet.c	2020-02-14 16:55:54.227165835 +0100

@@ -26,6 +26,8 @@

 #include "timer.h"

 #include "../data/data.h"

+// the bullets themselves

+Tbullet bullet[MAX_BULLETS];

 // sets values on a bullet

 void set_bullet(Tbullet *b, int x, int y, double dx, double dy, BITMAP *bmp, int bad) {

diff -ur alex4src/src/bullet.h alex4src.nre/src/bullet.h

--- alex4src/src/bullet.h	2020-02-14 20:21:00.557446660 +0100

+++ alex4src.nre/src/bullet.h	2020-02-14 16:55:54.227165835 +0100

@@ -42,7 +42,7 @@

 #define MAX_BULLETS	64

 // the bullets themselves

-Tbullet bullet[MAX_BULLETS];

+extern Tbullet bullet[MAX_BULLETS];

 // functions

 void reset_bullets(Tbullet *b, int max);

diff -ur alex4src/src/edit.c alex4src.nre/src/edit.c

--- alex4src/src/edit.c	2020-02-14 20:21:00.559446658 +0100

+++ alex4src.nre/src/edit.c	2020-02-14 20:14:07.160857305 +0100

@@ -33,8 +33,6 @@

 int edit_tile = 0;

 // path to current map

 char edit_path_and_file[1024];

-// datafile to use

-DATAFILE *data;

 // current edit mode

 int edit_mode;

diff -ur alex4src/src/main.h alex4src.nre/src/main.h

--- alex4src/src/main.h	2020-02-14 20:21:00.556446662 +0100

+++ alex4src.nre/src/main.h	2020-02-14 20:13:57.681842152 +0100

@@ -59,6 +59,7 @@

 #define		SMPL_TALK		24

 #define		SMPL_BEAM		25

+extern DATAFILE *data;

 // functions

 char *get_init_string();

diff -ur alex4src/src/particle.c alex4src.nre/src/particle.c

--- alex4src/src/particle.c	2003-07-26 12:53:52.000000000 +0200

+++ alex4src.nre/src/particle.c	2020-02-14 20:17:53.166697996 +0100

@@ -21,16 +21,11 @@

+#include "main.h"

 #include "particle.h"

-// pointer to datafile

-DATAFILE *data;

-

-

-// set datafile to use

-void set_datafile(DATAFILE *d) {

-	data = d;

-}

+// the particles themselves

+Tparticle particle[MAX_PARTICLES];

 // inits variables in a particle

diff -ur alex4src/src/particle.h alex4src.nre/src/particle.h

--- alex4src/src/particle.h	2020-02-14 20:21:00.555446663 +0100

+++ alex4src.nre/src/particle.h	2020-02-14 20:15:57.210817230 +0100

@@ -42,10 +42,9 @@

 // the particles themselves

-Tparticle particle[MAX_PARTICLES];

+extern Tparticle particle[MAX_PARTICLES];

 // functions

-void set_datafile(DATAFILE *d);

 void reset_particles(Tparticle *p, int max);

 Tparticle *get_free_particle(Tparticle *p, int max);

 void set_particle(Tparticle *p, int x, int y, double dx, double dy, int color, int life, int bmp);

diff -ur alex4src/src/player.c alex4src.nre/src/player.c

--- alex4src/src/player.c	2003-07-26 12:53:52.000000000 +0200

+++ alex4src.nre/src/player.c	2020-02-14 16:55:54.229165835 +0100

@@ -25,6 +25,9 @@

 #include "timer.h"

 #include "../data/data.h"

+// the player 

+Tplayer player;

+

 // draws the player depending on his state

 void draw_player(BITMAP *bmp, Tplayer *p, int x, int y) {

 	BITMAP *head, *body;

diff -ur alex4src/src/player.h alex4src.nre/src/player.h

--- alex4src/src/player.h	2020-02-14 20:21:00.554446664 +0100

+++ alex4src.nre/src/player.h	2020-02-14 16:55:54.229165835 +0100

@@ -53,7 +53,7 @@

 // the player 

-Tplayer player;

+extern Tplayer player;

 // functions

 void draw_player(BITMAP *bmp, Tplayer *p, int x, int y);

diff -ur alex4src/src/script.c alex4src.nre/src/script.c

--- alex4src/src/script.c	2020-02-14 20:21:00.560446657 +0100

+++ alex4src.nre/src/script.c	2020-02-14 20:14:25.441886527 +0100

@@ -33,9 +33,8 @@

 // silly value 

 #define		NO_CHANGE	-3249587

-

-// datafile to use

-DATAFILE *data;

+// array holding the sounds ids

+int active_sounds[MAX_SCRIPT_SOUNDS];

 // internal buffers

 BITMAP *buffer;

 BITMAP *swap_buffer;

diff -ur alex4src/src/script.h alex4src.nre/src/script.h

--- alex4src/src/script.h	2020-02-14 20:21:00.556446662 +0100

+++ alex4src.nre/src/script.h	2020-02-14 16:55:54.230165835 +0100

@@ -42,7 +42,7 @@

 // max number of sounds played by the script

 #define MAX_SCRIPT_SOUNDS	16

 // array holding the sounds ids

-int active_sounds[MAX_SCRIPT_SOUNDS];

+extern int active_sounds[MAX_SCRIPT_SOUNDS];

 // functions

diff -ur alex4src/src/timer.c alex4src.nre/src/timer.c

--- alex4src/src/timer.c	2020-02-14 20:21:00.557446660 +0100

+++ alex4src.nre/src/timer.c	2020-02-14 16:55:54.226165836 +0100

@@ -23,6 +23,14 @@

 #include "allegro.h"

 #include "timer.h"

+// the variables used by the timers

+volatile int frame_count;

+volatile int fps;

+volatile int logic_count;

+volatile int lps;

+volatile int cycle_count;

+volatile int game_count;

+

 // keeps track of frames each second

 void fps_counter(void) {

 	fps = frame_count;

diff -ur alex4src/src/timer.h alex4src.nre/src/timer.h

--- alex4src/src/timer.h	2020-02-14 20:21:00.556446662 +0100

+++ alex4src.nre/src/timer.h	2020-02-14 16:55:54.227165835 +0100

@@ -24,12 +24,12 @@

 #define _TIMERS_H_

 // the variables used by the timers

-volatile int frame_count;

-volatile int fps;

-volatile int logic_count;

-volatile int lps;

-volatile int cycle_count;

-volatile int game_count;

+extern volatile int frame_count;

+extern volatile int fps;

+extern volatile int logic_count;

+extern volatile int lps;

+extern volatile int cycle_count;

+extern volatile int game_count;

 // functions