diff --git a/Jamconfig.in b/Jamconfig.in
index a70d42a..0108bb4 100644
--- a/Jamconfig.in
+++ b/Jamconfig.in
@@ -129,6 +129,9 @@ X_EXTRA_LIBS ?= @X_EXTRA_LIBS@ ;
 # solo XKB extension library
 XKB_LIBS ?= @XKB_LIBS@ ;
 
+# shape extension
+XSHAPE_LIBS ?= @XSHAPE_LIBS@ ;
+
 # curl libraries
 CURL_CFLAGS  ?= @CURL_CFLAGS@ ;
 CURL_LIBS    ?= @CURL_LIBS@ ;
diff --git a/configure.in b/configure.in
index a303a13..862f00f 100644
--- a/configure.in
+++ b/configure.in
@@ -89,6 +89,7 @@ if test "$enable_shape" = "yes"; then
 
 	if test "$have_xshape" = "yes"; then
 		AC_DEFINE(HAVE_SHAPE, 1, [Define to 1 if you have XShape extension])
+		XSHAPE_LIBS="-lXext"
 	fi
 fi
 
@@ -300,6 +301,7 @@ AC_SUBST(CURL_CFLAGS)
 AC_SUBST(CURL_LIBS)
 AC_SUBST(LARGEFILE)
 AC_SUBST(XKB_LIBS)
+AC_SUBST(XSHAPE_LIBS)
 AC_SUBST(my_sysconfdir)
 AC_SUBST(KSTAT_LIBS)
 AC_SUBST(PEKWM_CXXFLAGS)