diff --git a/acinclude.m4 b/acinclude.m4
index edc7eccc0..e10f8ceb2 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -630,8 +630,8 @@ for be in ${BACKENDS}; do
       echo "*** $be backend currently requires JPEG library - $DISABLE_MSG"
       backend_supported="no"
     else
-      if test "x${have_jpeg_crop_scanline}" != "xyes" \
-      || test "x${have_jpeg_skip_scanline}" != "xyes"; then
+      if test "x${ac_cv_func_jpeg_crop_scanline}"  != "xyes" \
+      || test "x${ac_cv_func_jpeg_skip_scanlines}" != "xyes"; then
         echo "*** $be backend requires a newer JPEG library - $DISABLE_MSG"
         backend_supported="no"
       fi
diff --git a/configure.ac b/configure.ac
index 5ce16a263..d927f8b2b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -697,7 +697,10 @@ fi
 
 if test "${sane_cv_use_libjpeg}" = "yes"; then
   SANEI_SANEI_JPEG_LO="../sanei/sanei_jpeg.lo"
+  saved_LIBS="${LIBS}"
+  LIBS="${JPEG_LIBS}"
   AC_CHECK_FUNCS(jpeg_crop_scanline jpeg_skip_scanlines)
+  LIBS="${saved_LIBS}"
 fi
 AM_CONDITIONAL(HAVE_JPEG, test x$sane_cv_use_libjpeg = xyes)
 AC_SUBST(SANEI_SANEI_JPEG_LO)