--- pgplot.m4	2004-10-18 13:13:21.000000000 +0200
+++ pgplot.m4.new	2009-05-13 11:52:43.000000000 +0200
@@ -15,7 +15,7 @@
 
 if test "x$pgplot_prefix" != x ; then
   PGPLOT_CFLAGS="-I$pgplot_prefix/include"
-  PGPLOT_LIBS="-L$pgplot_prefix/lib -lpgplot"
+  PGPLOT_LIBS="-L$pgplot_prefix/lib -lpgplot -lcpgplot"
 fi
 
 AC_MSG_CHECKING([for libpgplot])