Update README

README

@@ -9,11 +9,22 @@ still missing,including:
 	The original versions of __syscall4(),__syscall5() and __syscall6()
 	don't work.They are replaced by assembly implemention in
 	/src/unistd/x86_64/syscall.S
+- math library is removed momently.
+	Because some missing floating-point features of TinyCC.I am working
+	on completing.
+- @PLT dynamic linking function calls are removed.
+	TinyCC does not have the feature.Dynamic linking library(.so)
+	is expected not to work.
+- fenv library is removed momently.
+	I am working on adding the missing fp instructions to TinyCC.
 
 To compile,simply run 
 	export CC=tcc			# Set the compiler
+	export RANLIB='tcc -r'		# Using tcc builtin librarian
+	export AR='tcc -ar'		# See above
 	./configure --target=x86_64	# The script cannot detect the
-					  platform with tcc.
+					# platform with tcc because of
+					# missing option "-dumpmachine"
 	make
 
 All modified and addtional files are under MIT License as well.