Switch build from docbook manual to sphinx

Also remove linearization from qpdf-manual.pdf. It's a small file, and
removing the dependency on the qpdf executable significantly shortens
build times.

1 files changed, 5 insertions, 4 deletions

diff --git a/appimage/build-appimage b/appimage/build-appimage
index 03039ed1..04fa805b 100755
--- a/appimage/build-appimage
+++ b/appimage/build-appimage
@@ -43,24 +43,25 @@ if [ "x$1" == "x--sign" ]; then
 fi
 
 
-# Check if we are on Ubuntu Trusty
+# Check Ubuntu Distribution
 _osversion=$(cat /etc/os-release | grep PRETTY_NAME | awk -F'=' '{print $2}' | sed 's#"##g')
 
 # Warn users building the AppImage locally:
-if [[ ! $_osversion =~ Ubuntu\ 16.04.*\ LTS ]]; then
+if [[ ! $_osversion =~ Ubuntu\ 18.04.*\ LTS ]]; then
 set +x
     echo ""
     #    0         1         2         3         4         5         6         7
     #    01234567890123456789012345678901234567890123456789012345678901234567890123456789
     echo "+===========================================================================+"
     echo "|| WARNING: You are about to build a QPDF AppImage on a system which is    ||"
-    echo "|| NOT Ubuntu 16.04 LTS ('Xenial').                                        ||"
+    echo "|| NOT Ubuntu 18.04 LTS.                                                   ||"
     echo "||                                                                         ||"
     echo "||    It is recommended that you use a distribution that is at least a     ||"
     echo "||    few years old to maximize the number of Linux distributions the      ||"
     echo "||    resulting AppImage will work on. AppImages often don't work on       ||"
     echo "||    distributions older than the one they were built on because of       ||"
-    echo "||    standard library differences.                                        ||"
+    echo "||    standard library differences. The oldest supported Ubuntu LTS is     ||"
+    echo "||    a good option.                                                       ||"
     echo "+===========================================================================+"
     echo ""
 set -x