Allow USE_DOSEMU=1 to be specified at install time and persisted in the

src/build/localdefs.mk file.

install/GNUmakefile

@@ -29,6 +29,7 @@
 # NO_X = Don't include build conio library (ciolib) for X
 # NO_GTK = Don't build GTK-based sysop tools
 # X_PATH = /path/to/X (if not /usr/X11R6)
+# USE_DOSEMU = Set to 1 to enable Linux-DOSEMU support
 
 # the magic bit:
 MKFLAGS += MAKEFLAGS=
@@ -132,6 +133,10 @@ ifdef X_PATH
  MKFLAGS	+=	X_PATH=$(X_PATH)
 endif
 
+ifdef USE_DOSEMU
+ MKFLAGS	+=	USE_DOSEMU=$(USE_DOSEMU)
+endif
+
 # Check for GLADE
 ifndef NO_GTK
  ifeq ($(shell pkg-config libglade-2.0 --exists && echo YES),YES)