Don't compile sanei_jpeg if libjpeg is unavailable.

ChangeLog

@@ -1,6 +1,8 @@
 2009-02-11  Mattias Ellert <mattias.ellert@fysast.uu.se>
 	* acinclude.m4, backend/Makefile.am: Restore the removed
 	DYNAMIC_FLAG configuration.
+	* acinclude.m4, sanei/sanei_jpeg.c: Don't compile sanei_jpeg
+	if libjpeg is unavailable.
 
 2009-01-31 Chris Bagwell <cbagwell-guest at users.alioth.debian.org>
 	* backend/Makefil.am: Add missing math library to coolscan2

acinclude.m4

@@ -257,6 +257,9 @@ AC_DEFUN([SANE_CHECK_JPEG],
       AC_MSG_RESULT(yes)],[AC_MSG_RESULT(no)])
     ],)
   ],)
+  if test "$sane_cv_use_libjpeg" = "yes" ; then
+    AC_DEFINE(HAVE_LIBJPEG,1,[Define to 1 if you have the libjpeg library.])
+  fi
   AC_SUBST(JPEG_LIBS)
 ])
 

configure

@@ -8861,6 +8861,13 @@ fi
 
 fi
 
+  if test "$sane_cv_use_libjpeg" = "yes" ; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_LIBJPEG 1
+_ACEOF
+
+  fi
 
 
 

include/sane/config.h.in

@@ -150,6 +150,9 @@
 /* Define to 1 if you have the `ieee1284' library (-lcam). */
 #undef HAVE_LIBIEEE1284
 
+/* Define to 1 if you have the libjpeg library. */
+#undef HAVE_LIBJPEG
+
 /* Define to 1 if you have the `usb' library (-lusb). */
 #undef HAVE_LIBUSB
 

sanei/sanei_jpeg.c

@@ -3,6 +3,10 @@
    README.jpeg in the top level directory.
  */
 
+#include "../include/sane/config.h"
+
+#ifdef HAVE_LIBJPEG
+
 #include "sane/sanei_jpeg.h"
 
 typedef struct
@@ -227,3 +231,5 @@ sanei_jpeg_jinit_write_ppm (j_decompress_ptr cinfo)
 
   return (djpeg_dest_ptr) dest;
 }
+
+#endif