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File iscan.patch of Package iscan

--- a/configure.ac
+++ b/configure.ac
@@ -282,6 +282,7 @@ AC_DEFUN([ISCAN_FILE_FORMAT],
 		  AC_HELP_STRING([--enable-$1],
 				 [ensure support for the $3 file format]),
 		  [if test "x$enable_$1" != xno; then
+			PKG_CHECK_MODULES($3, $4)
 		      iff_header="`echo $2 | $as_tr_sh`"
 		      AC_CHECK_HEADERS([$2])
 		      if test `eval echo '$ac_cv_header_'$iff_header` \
@@ -292,9 +293,9 @@ AC_DEFUN([ISCAN_FILE_FORMAT],
 		  [AC_CHECK_HEADERS([$2])])
    ])
 
-ISCAN_FILE_FORMAT(jpeg,jpeglib.h,JPEG)
-ISCAN_FILE_FORMAT(png,png.h,PNG)
-ISCAN_FILE_FORMAT(tiff,tiffio.h,TIFF)
+ISCAN_FILE_FORMAT(jpeg,jpeglib.h,JPEG,libjpeg)
+ISCAN_FILE_FORMAT(png,png.h,PNG,libpng)
+ISCAN_FILE_FORMAT(tiff,tiffio.h,TIFF,libtiff-4)
 
 
 dnl  Support for performance measurements.
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -27,8 +27,8 @@ SUBDIRS = \
 
 if ENABLE_FRONTEND
 noinst_LTLIBRARIES = libimage-stream.la
-libimage_stream_la_CPPFLAGS = -I$(top_srcdir)/include
-libimage_stream_la_LDFLAGS = -static
+libimage_stream_la_CPPFLAGS = -I$(top_srcdir)/include $(PNG_CFLAGS) $(JPEG_CFLAGS) $(TIFF_CFLAGS)
+libimage_stream_la_LDFLAGS = -static $(PNG_LIBS) $(JPEG_LIBS) $(TIFF_LIBS)
 libimage_stream_la_LIBADD  = \
 	$(LIBLTDL) \
 	$(top_builddir)/lib/pdf/libpdf.la