diff --git  a/lib/Makefile.in b/lib/Makefile.in
index 843e178..8e77ec7 100644
--- a/lib/Makefile.in
+++ b/lib/Makefile.in
@@ -4,7 +4,7 @@
 CFLAGS_WARNING=@CFLAGS_WARNING@
 
 CC=@TCL_CC@
-CFLAGS=@CFLAGS@@TCL_INCLUDE_SPEC@
+CFLAGS=@CFLAGS@ @TCL_INCLUDE_SPEC@
 # apply specific flags if code coverage asked
 ifeq ($(COVERAGE),y)
 CFLAGS += -coverage -O0