WARNING: X11/extensions/scrnsaver.h: present but cannot be compiled

[Hari Nair]

I have a configure script which was generated with
autoconf 2.57 on a FreeBSD 5.0 system.  Running the
configure script on a Solaris 8 system gives the
following sequence:

checking X11/extensions/scrnsaver.h usability... no
checking X11/extensions/scrnsaver.h presence... yes
configure: WARNING: X11/extensions/scrnsaver.h: present
but cannot be compiled
configure: WARNING: X11/extensions/scrnsaver.h: check
for missing prerequisite headers?
configure: WARNING: X11/extensions/scrnsaver.h:
proceeding with the preprocessor's result
configure: WARNING:     ##
------------------------------------ ##
configure: WARNING:     ## Report this to
address@hidden ##
configure: WARNING:     ##
------------------------------------ ##
checking for X11/extensions/scrnsaver.h... yes

The function that checks for these header files is

AC_DEFUN(AC_FIND_XSS,
[
AC_ARG_ENABLE(screensaver,   [  --disable-screensaver 
 compile without X screensaver
extension],enable_xss=no,enable_xss=yes)
dnl Check for XScreenSaver
if test "$enable_xss" = "yes" ; then
    have_xss=no
    AC_CHECK_HEADER(X11/extensions/scrnsaver.h,
[have_xss=yes])
    if test "$have_xss" = "yes"; then
        AC_CHECK_LIB(Xext,
XScreenSaverRegister,[XSS_LIBS="-lXext"],[have_xss=no],[-lX11
-lm])
        if test "$have_xss" = "no"; then
          AC_CHECK_LIB(Xss, XScreenSaverRegister,[have_xss=yes;
XSS_LIBS="-lXss -lXext"],[have_xss=no],[$X_LIBS -lX11
-lXext -lm])
        fi
        if test "$have_xss" = "yes"; then
           AC_DEFINE(HAVE_XSS,,Define if you have X screensaver
extension)
           AC_SUBST(XSS_LIBS)
        fi
    fi
fi
])

If I can supply any more information please let me know.

Hari Nair