newer versions of qemu have different binary names (per Joel Nider <joel@nider.org>)

Makefile

@@ -29,7 +29,7 @@ OBJS = \
 	vm.o\
 
 # Cross-compiling (e.g., on Mac OS X)
-#TOOLPREFIX = i386-jos-elf-
+# TOOLPREFIX = i386-jos-elf
 
 # Using native tools (e.g., on X86 Linux)
 #TOOLPREFIX = 
@@ -51,12 +51,14 @@ TOOLPREFIX := $(shell if i386-jos-elf-objdump -i 2>&1 | grep '^elf32-i386$$' >/d
 endif
 
 # If the makefile can't find QEMU, specify its path here
-#QEMU = 
+QEMU = qemu-system-i386
 
 # Try to infer the correct QEMU
 ifndef QEMU
 QEMU = $(shell if which qemu > /dev/null; \
 	then echo qemu; exit; \
+	elif which qemu-system-i386 > /dev/null; \
+	then echo qemu-system-i386; exit; \
 	else \
 	qemu=/Applications/Q.app/Contents/MacOS/i386-softmmu.app/Contents/MacOS/i386-softmmu; \
 	if test -x $$qemu; then echo $$qemu; exit; fi; fi; \