File libctl-sincos-check.patch of Package libctl

Index: libctl-3.2.2/configure.ac
===================================================================
--- libctl-3.2.2.orig/configure.ac
+++ libctl-3.2.2/configure.ac
@@ -50,6 +50,9 @@ fi
 # Checks for header files.
 AC_HEADER_STDC
 
+# Checks for libc math library.
+AC_CHECK_LIB([m], [sincos])
+
 ###########################################################################
 
 # Find Guile library, flags, etcetera: