--- a/unix/configure.in	2020-12-26 11:26:32.952828258 +0100
+++ b/unix/configure.in	2020-12-26 11:26:45.027642732 +0100
@@ -663,7 +663,7 @@
     TCL_STUB_FLAGS="-DUSE_TCL_STUBS"
 fi
 
-test -z "$TK_LIBRARY" && TK_LIBRARY='$(prefix)/lib/tk$(VERSION)'
+test -z "$TK_LIBRARY" && TK_LIBRARY='$(libdir)/tk$(VERSION)'
 PRIVATE_INCLUDE_DIR='$(includedir)'
 HTML_DIR='$(DISTDIR)/html'
 TK_PKG_DIR='tk$(VERSION)'