File add-ac_prog_cpp.patch of Package csync2.19003

Index: csync2-2.0+git.1368794815.cf835a7/configure.ac
===================================================================
--- csync2-2.0+git.1368794815.cf835a7.orig/configure.ac
+++ csync2-2.0+git.1368794815.cf835a7/configure.ac
@@ -29,6 +29,7 @@ AM_CONFIG_HEADER(config.h)
 
 # Checks for programs.
 AC_PROG_CC
+AC_PROG_CPP
 AC_PROG_INSTALL
 AC_PROG_YACC
 AM_PROG_LEX