Removed the "LINUX" definition.

This is silly. The libraries used have absolutely nothing to do with
"Linux". They're POSIX standard libraries, and will work just as
well on Mac OS X and BSD. The actual code might need to be replaced,
but in any case, this isn't something to limit to "Linux" systems.

Makefile

@@ -1,5 +1,5 @@
 CXXFLAGS ?= -O2 -Wall -g
-CXXFLAGS += `pkg-config --cflags sdl2 SDL2_image SDL2_mixer` -DLINUX
+CXXFLAGS += `pkg-config --cflags sdl2 SDL2_image SDL2_mixer`
 LIBS = `pkg-config --libs sdl2 SDL2_image SDL2_mixer`
 OBJS = alien.o audio.o bullets.o cargo.o collectable.o comms.o debris.o events.o explosions.o game.o globals.o graphics.o init.o intermission.o loadSave.o messages.o misc.o missions.o player.o resources.o script.o shop.o Starfighter.o title.o weapons.o
 

src/init.cpp

@@ -19,12 +19,10 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include "Starfighter.h"
 
-#if LINUX
 #include <sys/stat.h>
 #include <pwd.h>
 #include <unistd.h>
 #include <errno.h>
-#endif
 
 /*
 Initalises a whole load of variables
@@ -109,7 +107,6 @@ This bit is just for Linux users. It attempts to get the user's
 home directory, then creates the .parallelrealities and .parallelrealities/starfighter
 directories so that saves and temporary data files can be written there. Good, eh? :)
 */
-#if LINUX
 static void setupUserHomeDirectory()
 {
 	char *userHome;
@@ -144,7 +141,6 @@ static void setupUserHomeDirectory()
 
 	sprintf(engine.userHomeDirectory, "%s/.parallelrealities/starfighter/", userHome);
 }
-#endif
 
 /*
 Chugg chugg chugg.... brrr... chugg chugg chugg...brrrrrr... chugg ch..
@@ -154,9 +150,7 @@ void initSystem()
 {
 	strcpy(engine.userHomeDirectory, "");
 
-	#if LINUX
 	setupUserHomeDirectory();
-	#endif
 
 	/* Initialize the SDL library */
 	if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_AUDIO|SDL_INIT_JOYSTICK) < 0)

src/structs.h

@@ -290,7 +290,6 @@ struct globalEngineVariables {
 	bool useMusic;
 	bool fullScreen;
 
-	// This really only applies to Linux users.
 	char userHomeDirectory[1024];
 	
 	char keyState[KEY_LAST];