https://sourceforge.net/p/gnuplot/bugs/2727/

--- a/demo/watchpoints.dem
+++ b/demo/watchpoints.dem
@@ -67,6 +67,12 @@
 pause -1 "<cr> to continue"
 
 reset
+
+if (!strstrt(GPVAL_COMPILE_OPTIONS, "+LIBCERF")) {
+    print "This copy of gnuplot does not support FresnelC, FresnelS"
+    exit;
+}
+
 unset key
 set title "Find y intercepts of a parametric function" offset 0,-1
 set xrange [-0.1 : 0.9]