AC_CHECK_HEADER don't work for gnome headers?!?

["Germano Rizzo" <manomano ciaoweb it>]

Hi,
    I'm trying to make my configure.in check for headers... I've put these
three commands in it:

AC_CHECK_HEADER(gnome.h, ,[
dnl AC_MSG_ERROR(gnome-libs header not found. Try installing the devel
package...)])
AC_CHECK_HEADER(gdk-pixbuf/gdk-pixbuf.h, ,[
AC_MSG_ERROR(GdkPixbuf header not found. Try installing the devel
package...)])
AC_CHECK_HEADER(esd.h, ,[
AC_MSG_ERROR(esound header not found. Try installing the devel package...)])

    Needless to say, I have these three headers installed, in /usr/include
the first and last, and in /usr/include/gdk-pixbuf/ the second.
    Now, the configure script don't see neither gnome.h, nor gdk-pixbuf.h;
but it sees esd.h!! I've tried dozen of times, putting them in different
positions... esd (but also png.h) is recognized, but gnome.h and
gdk-pixbuf.h don't! No way!
    Where am I wrong? Am I wrong? Please help me!
        Have a nice everything,
            Mano :)

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