1 files changed, 3 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index f406e7acd..c2477fe7a 100644
--- a/Makefile
+++ b/Makefile
@@ -37,6 +37,9 @@ CXX = gcc
 CXXFLAGS += -std=gnu++0x -march=native -O3 -DNDEBUG
 endif
 
+CXXFLAGS += -I/usr/include/tcl8.5 -DYOSYS_ENABLE_TCL
+LDLIBS += -ltcl8.5
+
 include frontends/*/Makefile.inc
 include passes/*/Makefile.inc
 include backends/*/Makefile.inc