--- /dev/null
+Use pkg-config for libtiff detection
+
+Using pkg-config allows proper behavior in static-only contexts: the
+libtiff library might depend on libz and libjpeg.
+
+This patch also fixes a few other issues in the configure.ac script
+that prevents autoreconf to work, or proper detection of the proj
+library.
+
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+
+Index: b/configure.ac
+===================================================================
+--- a/configure.ac
++++ b/configure.ac
+@@ -196,39 +196,12 @@
+
+ TIFF_CONFIG="no"
+
+-AC_ARG_WITH(libtiff, [ --with-libtiff=dir Use libtiff in directory dir],,)
+-
+-if test "$with_libtiff" != "" ; then
+- if test -f $with_libtiff/include/tiffio.h -a -d $with_libtiff/lib ; then
+- LIBS="-L$with_libtiff/lib -ltiff $LIBS"
+- TIFF_INC=-I$with_libtiff/include
+- else
+- LIBS="-L$with_libtiff -ltiff $LIBS"
+- TIFF_INC=-I$with_libtiff
+- fi
+- LIBS_SAVED="$LIBS"
+- AC_CHECK_LIB(tiff,TIFFOpen,[TIFF_CONFIG=yes],
+- AC_MSG_ERROR([failed to link with -ltiff to find TIFFOpen]),-lm)
+- AC_CHECK_LIB(tiff,TIFFMergeFieldInfo,[TIFF_CONFIG=yes],
+- AC_MSG_ERROR([Libtiff 3.6.0 Beta or later required for this version of
+-libgeotiff. Please upgrade or use an older version of libgeotiff.]),-lm)
+- LIBS="$LIBS_SAVED"
+-else
+- AC_CHECK_LIB(tiff,TIFFOpen,[TIFF_CONFIG=yes],
+- AC_MSG_ERROR([You will need to substantially rewrite libxtiff to
+-build libgeotiff without libtiff]),-lm)
+- LIBS_SAVED="$LIBS"
+- AC_CHECK_LIB(tiff,TIFFMergeFieldInfo,[TIFF_CONFIG=yes],
+- AC_MSG_ERROR([Libtiff 3.6.0 Beta or later required for this version of
+-libgeotiff. Please upgrade libtiff or use an older version of libgeotiff.]),-lm)
+- LIBS="$LIBS -ltiff"
+- TIFF_INC=
+- TIFF_CONFIG="yes"
+-fi
+-
++PKG_CHECK_MODULES(LIBTIFF, libtiff-4)
++TIFF_INC="$LIBTIFF_CFLAGS"
++LIBS="$LIBS $LIBTIFF_LIBS"
++TIFF_CONFIG="yes"
+
+ AC_SUBST([TIFF_INC])
+-AC_SUBST([TIFF_PREFIX])
+ AM_CONDITIONAL([TIFF_IS_CONFIG], [test ! x$TIFF_CONFIG = xno])
+
+ dnl
+@@ -280,15 +253,16 @@
+ PROJ_INC=-I$PROJ_INC
+
+ AC_SUBST(PROJ_INC,$PROJ_INC)
+- AC_DEFINE(HAVE_PROJECTS_H)
++ AC_DEFINE([HAVE_PROJECTS_H], [], [Whether proj library header is available])
+ AC_DEFINE(HAVE_LIBPROJ)
+ AC_SUBST([HAVE_LIBPROJ])
+ PROJ_CONFIG="yes"
+-
+ else
+ AC_CHECK_LIB(proj,pj_init,,,-lm)
+ AC_CHECK_HEADERS(proj_api.h,,)
+- PROJ_CONFIG="yes"
++ if "$ac_cv_lib_proj_pj_init" = "yes" -a "$ac_cv_header_proj_api_h" = "yes"; then
++ PROJ_CONFIG="yes"
++ fi
+ fi
+
+ AM_CONDITIONAL([PROJ_IS_CONFIG], [test ! x$PROJ_CONFIG = xno])