Integrate OpenAL into the options system

Makefile

@@ -30,6 +30,10 @@ WITH_CDA=yes
 # dependencies to libogg, libvorbis and libvorbisfile.
 WITH_OGG=yes
 
+# Enables the optional OpenAL sound systems. Adds
+# a dependencx to libopenal
+WITH_OPENAL=yes
+
 # Enables retexturing support. Adds a dependency to
 # libjpeg
 WITH_RETEXTURING=yes
@@ -182,6 +186,11 @@ release/quake2 : CFLAGS += -DOGG
 release/quake2 : LDFLAGS += -lvorbis -lvorbisfile -logg
 endif
 
+ifeq ($(WITH_OPENAL),yes)
+release/quake2 : CFLAGS += -DUSE_OPENAL -DDEFAULT_OPENAL_DRIVER='"libopenal.so.1"'
+release/quake2 : LDFLAGS += -lopenal
+endif
+
 ifeq ($(WITH_ZIP),yes)
 release/quake2 : CFLAGS += -DZIP
 release/quake2 : LDFLAGS += -lz

src/unix/main.c

@@ -66,6 +66,11 @@ main ( int argc, char **argv )
 #else
 	printf(" - OGG/Vorbis\n");
 #endif
+#ifdef USE_OPENAL
+	printf(" + OpenAL\n");
+#else
+	printf(" - OpenAL\n");
+#endif
 #ifdef ZIP
 	printf(" + Zip file support\n");
 #else