AC_CHECK_HEADER newbie problem

[Genty Jean-Paul]

  Hi

  I assume I installed myfile.h in $HOME/local/include/mylib

  I want to AC_CHECK_HEADER  this file.
  In configure.in I do:

  CXXCPPFLAGS="$CXXCPPFLAGS -I$HOME/local/include"
  CPPFLAGS="$CPPFLAGS -I$HOME/local/include"
  AC_CHECK_HEADER(mylib/myfile.h, myfile=yes, myfile=no)


  AC_CHECK_HEADER does not detect myfile.h.
  What did I do wrong ??

  Thanks for your answers.

   Jean-Paul Genty