diff --git a/Makefile b/Makefile
index 1ca7f2fbd..da174497f 100644
--- a/Makefile
+++ b/Makefile
@@ -123,7 +123,7 @@ LDLIBS += $(shell pkg-config --silence-errors --libs libffi || echo -lffi) -ldl
 endif
 
 ifeq ($(ENABLE_TCL),1)
-TCL_VERSION ?= tcl8.5
+TCL_VERSION ?= tcl$(shell echo 'puts [info tclversion]' | tclsh)
 TCL_INCLUDE ?= /usr/include/$(TCL_VERSION)
 CXXFLAGS += -I$(TCL_INCLUDE) -DYOSYS_ENABLE_TCL
 LDLIBS += -l$(TCL_VERSION)
diff --git a/README b/README
index fbd92db36..4ef430938 100644
--- a/README
+++ b/README
@@ -56,7 +56,7 @@ For example on Ubuntu Linux 14.04 LTS the following commands will install all
 prerequisites for building yosys:
 
 	$ yosys_deps="build-essential clang bison flex libreadline-dev gawk
-	       tcl8.5-dev libffi-dev git mercurial graphviz xdot pkg-config"
+	       tcl-dev libffi-dev git mercurial graphviz xdot pkg-config"
 	$ sudo apt-get install $yosys_deps
 
 There are also pre-compiled Yosys binary packages for Ubuntu and Win32 as well