diff --git a/generate-pdf.sh b/generate-pdf.sh
new file mode 100755
index 0000000..9158a45
--- /dev/null
+++ b/generate-pdf.sh
@@ -0,0 +1,46 @@
+#! /bin/sh
+
+# This script builds the PDF version of the PostgreSQL documentation.
+#
+# In principle we could do this as part of the RPM build, but there are
+# good reasons not to:
+# 1. The build would take longer and have a larger BuildRequires footprint.
+# 2. The generated PDF has timestamps in it, which would inevitably result
+#    in multilib conflicts due to slightly different timestamps.
+# So instead, we run this manually when rebasing to a new upstream release,
+# and treat the resulting PDF as a separate Source file.
+#
+# You will need to have the docbook packages installed to run this.
+# Expect it to take about 20 minutes and use about 160MB of disk.
+
+# Extract version from specfile
+
+VERSION=`sed -n 's/^Version: //p' postgresql.spec`
+
+TARGETFILE=postgresql-$VERSION-US.pdf
+
+echo Building $TARGETFILE ...
+
+# Unpack and configure postgresql
+
+tar xfj postgresql-$VERSION.tar.bz2 || exit 1
+
+cd postgresql-$VERSION || exit 1
+
+./configure >/dev/null || exit 1
+
+# Build the PDF docs
+
+cd doc/src/sgml
+
+make postgres-US.pdf >make.log || exit 1
+
+mv -f postgres-US.pdf ../../../../$TARGETFILE
+
+# Clean up
+
+cd ../../../..
+
+rm -rf postgresql-$VERSION
+
+exit 0
diff --git a/postgresql.spec b/postgresql.spec
index 058a6ac..933a858 100755
--- a/postgresql.spec
+++ b/postgresql.spec
@@ -61,6 +61,8 @@ Group: Applications/Databases
 Url: http://www.postgresql.org/ 
 
 Source0: ftp://ftp.postgresql.org/pub/source/v%{version}/postgresql-%{version}.tar.bz2
+# The PDF file is generated by generate-pdf.sh, which see for comments
+Source1: postgresql-%{version}-US.pdf
 Source3: postgresql.init
 Source4: Makefile.regress
 Source5: pg_config.h
@@ -69,7 +71,6 @@ Source7: ecpg_config.h
 Source14: postgresql.pam
 Source15: postgresql-bashprofile
 Source16: filter-requires-perl-Pg.sh
-Source17: http://www.postgresql.org/docs/manuals/postgresql-8.4.2-US.pdf
 
 Patch1: rpm-pgsql.patch
 Patch2: postgresql-ac-version.patch
@@ -278,7 +279,7 @@ system, including regression tests and benchmarks.
 
 autoconf
 
-cp -p %{SOURCE17} .
+cp -p %{SOURCE1} .
 
 %build