diff -Nru pdf2djvu-0.9.17/debian/changelog pdf2djvu-0.9.17/debian/changelog
--- pdf2djvu-0.9.17/debian/changelog	2020-03-04 03:14:07.000000000 +0000
+++ pdf2djvu-0.9.17/debian/changelog	2020-09-08 11:04:22.000000000 +0000
@@ -1,3 +1,10 @@
+pdf2djvu (0.9.17-1+rpi1) bullseye-staging; urgency=medium
+
+  * Apply upstream patches to fix poppler version parsing and
+    hence fix FTBFS with new poppler.
+
+ -- Peter Michael Green <plugwash@raspbian.org>  Tue, 08 Sep 2020 11:04:22 +0000
+
 pdf2djvu (0.9.17-1) unstable; urgency=medium
 
   * New upstream release.
diff -Nru pdf2djvu-0.9.17/debian/patches/catch-poppler-version-parsing-errors.patch pdf2djvu-0.9.17/debian/patches/catch-poppler-version-parsing-errors.patch
--- pdf2djvu-0.9.17/debian/patches/catch-poppler-version-parsing-errors.patch	1970-01-01 00:00:00.000000000 +0000
+++ pdf2djvu-0.9.17/debian/patches/catch-poppler-version-parsing-errors.patch	2020-09-08 11:04:22.000000000 +0000
@@ -0,0 +1,23 @@
+commit fbb1d294e7ea5727e52ba96e4df60ba557b192e1
+Author: Jakub Wilk <jwilk@jwilk.net>
+Date:   Mon Aug 3 10:05:31 2020 +0200
+
+    configure: catch Poppler version parsing errors.
+
+diff --git a/configure.ac b/configure.ac
+index 9f7bc46..e37bbf5 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -76,7 +76,11 @@ AC_MSG_RESULT([ok])
+ PKG_CHECK_MODULES([POPPLER], [poppler-splash >= 0.35.0])
+ poppler_version=$($PKG_CONFIG --modversion poppler-splash)
+ AC_DEFINE_UNQUOTED([POPPLER_VERSION_STRING], ["$poppler_version"], [Define to the version of Poppler])
+-poppler_version=$(IFS=.; set -- $poppler_version; printf '%d' $(( ((100 * $1) + $2) * 100 + $3 )) )
++AS_IF(
++  [poppler_version=$(IFS=.; set -- $poppler_version; printf '%d' $(( ((100 * $1) + $2) * 100 + $3 )) )],
++  [:],
++  [AC_MSG_ERROR([could not parse Poppler version])]
++)
+ AC_DEFINE_UNQUOTED([POPPLER_VERSION], [$poppler_version], [Define to the version of Poppler, as integer])
+ AC_MSG_CHECKING([for Poppler xpdf headers])
+ original_cppflags="$CPPFLAGS"
diff -Nru pdf2djvu-0.9.17/debian/patches/fix-poppler-version-parsing.patch pdf2djvu-0.9.17/debian/patches/fix-poppler-version-parsing.patch
--- pdf2djvu-0.9.17/debian/patches/fix-poppler-version-parsing.patch	1970-01-01 00:00:00.000000000 +0000
+++ pdf2djvu-0.9.17/debian/patches/fix-poppler-version-parsing.patch	2020-09-08 11:04:22.000000000 +0000
@@ -0,0 +1,41 @@
+commit 7056706cc72796634ebe75a1fb1b5a82c26faa49
+Author: Jakub Wilk <jwilk@jwilk.net>
+Date:   Mon Aug 3 10:05:31 2020 +0200
+
+    configure: fix Poppler version parsing.
+    
+    Fixes:
+    
+        ./configure: line 4073: ((100 * 20) + 08: value too great for base (error token is "08")
+        configure: error: could not parse Poppler version
+    
+    with Poppler 20.08.
+
+diff --git a/configure.ac b/configure.ac
+index e37bbf5..93afbe8 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -76,8 +76,22 @@ AC_MSG_RESULT([ok])
+ PKG_CHECK_MODULES([POPPLER], [poppler-splash >= 0.35.0])
+ poppler_version=$($PKG_CONFIG --modversion poppler-splash)
+ AC_DEFINE_UNQUOTED([POPPLER_VERSION_STRING], ["$poppler_version"], [Define to the version of Poppler])
++parse_poppler_version()
++{
++  test $# -eq 3 || return 1
++  printf '%s' "${1#0}"
++  shift
++  for v in "$@"
++  do
++    case $v in
++    ?) printf '0%s' "$v";;
++    ??) printf '%s' "$v";;
++    *) return 1;
++    esac
++  done
++}
+ AS_IF(
+-  [poppler_version=$(IFS=.; set -- $poppler_version; printf '%d' $(( ((100 * $1) + $2) * 100 + $3 )) )],
++  [poppler_version=$(IFS=.; parse_poppler_version $poppler_version)],
+   [:],
+   [AC_MSG_ERROR([could not parse Poppler version])]
+ )
diff -Nru pdf2djvu-0.9.17/debian/patches/series pdf2djvu-0.9.17/debian/patches/series
--- pdf2djvu-0.9.17/debian/patches/series	1970-01-01 00:00:00.000000000 +0000
+++ pdf2djvu-0.9.17/debian/patches/series	2020-09-08 11:04:22.000000000 +0000
@@ -0,0 +1,2 @@
+catch-poppler-version-parsing-errors.patch
+fix-poppler-version-parsing.patch