[gdk-pixbuf] build: Fix TIFF loader compilation with autotools

[Bastien Nocera <hadess src gnome org>]

commit 66537d1ecf7e857a0a443c1ebf72baf6f19dd3e4
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Sep 11 19:11:50 2017 +0200

    build: Fix TIFF loader compilation with autotools
    
    https://bugzilla.gnome.org/show_bug.cgi?id=786342

 configure.ac           |    7 +++----
 gdk-pixbuf/Makefile.am |    2 +-
 2 files changed, 4 insertions(+), 5 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 0abe5ce..c07bd6f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -564,7 +564,6 @@ dnl Test for libjasper
 *** --without-libjasper to configure])
   fi
 
-AC_SUBST(LIBTIFF)
 AC_SUBST(LIBJPEG)
 AC_SUBST(LIBPNG)
 AC_SUBST(LIBJASPER)
@@ -676,7 +675,7 @@ if test x$gio_can_sniff = x; then
   AC_DEFINE(GDK_PIXBUF_USE_GIO_MIME, 1, [Define if gio can sniff image data])
 fi
 
-AM_CONDITIONAL(HAVE_TIFF, test "x$LIBTIFF" != x)
+AM_CONDITIONAL(HAVE_TIFF, test "x$libtiff_found" != x)
 AM_CONDITIONAL(HAVE_PNG, test "x$LIBPNG" != x)
 AM_CONDITIONAL(HAVE_JPEG, test "x$LIBJPEG" != x)
 AM_CONDITIONAL(HAVE_JASPER, test "x$LIBJASPER" != x)
@@ -684,7 +683,7 @@ AM_CONDITIONAL(HAVE_JASPER, test "x$LIBJASPER" != x)
 if $dynworks ; then
   STATIC_LIB_DEPS=
   if echo "$included_loaders" | egrep '(^|,)tiff($|,)' > /dev/null; then
-    STATIC_LIB_DEPS="$STATIC_LIB_DEPS $LIBTIFF"
+    STATIC_LIB_DEPS="$STATIC_LIB_DEPS $TIFF_LIBS"
   fi
   if echo "$included_loaders" | egrep '(^|,)jpeg($|,)' > /dev/null; then
     STATIC_LIB_DEPS="$STATIC_LIB_DEPS $LIBJPEG"
@@ -698,7 +697,7 @@ if $dynworks ; then
     STATIC_LIB_DEPS="$STATIC_LIB_DEPS $LIBJASPER"
   fi
 else
-  STATIC_LIB_DEPS="$LIBTIFF $LIBJPEG $LIBPNG $LIBJASPER"
+  STATIC_LIB_DEPS="$TIFF_LIBS $LIBJPEG $LIBPNG $LIBJASPER"
 fi
 
 # Checks to see whether we should include mediaLib
diff --git a/gdk-pixbuf/Makefile.am b/gdk-pixbuf/Makefile.am
index 01b693c..720a058 100644
--- a/gdk-pixbuf/Makefile.am
+++ b/gdk-pixbuf/Makefile.am
@@ -88,7 +88,7 @@ libpixbufloader_pnm_la_LIBADD = $(module_libs)
 libstatic_pixbufloader_tiff_la_SOURCES = io-tiff.c
 libpixbufloader_tiff_la_SOURCES = io-tiff.c
 libpixbufloader_tiff_la_LDFLAGS = -avoid-version -module $(no_undefined)
-libpixbufloader_tiff_la_LIBADD = $(LIBTIFF) $(module_libs)
+libpixbufloader_tiff_la_LIBADD = $(TIFF_LIBS) $(module_libs)
 
 #
 # The XPM loader