doc: add missing -lm option to command line for compiling tut1

diff --git a/doc/tutorial.xml b/doc/tutorial.xml
index a5501a1cd64a9e4e1d0527a99559077e5fe207ea..fadc7e2d420fdb6bfcd857318c09a24821e9a7a5 100644 (file)
--- a/doc/tutorial.xml
+++ b/doc/tutorial.xml
@@ -42,7 +42,7 @@
     </para>
     
     <screen>
     </para>
     
     <screen>

-      cc tut1.c -lcomedi -o tut1
+      cc tut1.c -lcomedi -lm -o tut1

     </screen>
     <para>
       The
     </screen>
     <para>
       The