--- 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

​