Linux version can display SVN revision number in help screen, ONLY IF svn is installed. Otherwise, the normal version number shows.

Makefile

@@ -11,6 +11,7 @@ STRIP=strip -s
 DEL=rm -f
 OE=.o
 OUT=vbam
+BASEVERSION=1.8.0
 
 ifeq ($(MACHINE),Darwin)
 	LFLAGS=-lz -lpng -framework OpenGL `sdl-config --libs`
@@ -38,6 +39,23 @@ ifndef $(PREFIX)
   PREFIX=/usr/local
 endif
 
+ifndef VERSION
+  SVNVERSION=$(shell test -d .svn && svnversion -n .)
+  BADCHARS=$(findstring :,$(SVNVERSION))$(findstring S,$(SVNVERSION))
+  ifeq ($(BADCHARS),)
+    ifneq ($(SVNVERSION),)
+      ifneq ($(SVNVERSION),exported)
+        VERSION=$(BASEVERSION)-r$(subst M,,$(SVNVERSION))
+      endif
+    endif
+  endif
+endif
+
+ifdef VERSION
+  CXXFLAGS+=-DVERSION=\"$(VERSION)\"
+endif
+
+
 MAINDIR=src
 SDLDIR=src/sdl
 DMGDIR=src/gb