Fix configure script issue on Linux - no host_os_version.

Add help on building CUPS on Ubuntu - commands to get base dev packages.

3 files changed, 18 insertions, 0 deletions

diff --git a/INSTALL.md b/INSTALL.md
index 6acd9710c..c21cd85f5 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -30,6 +30,13 @@ Windows, and either MIT (1.6.3 or higher) or Heimdal Kerberos for Kerberos
 support.  CUPS will compile and run without these, however you'll miss out on
 many of the features provided by CUPS.
 
+On a stock Ubuntu install, the following command will install the required
+prerequisites:
+
+    sudo apt-get install autoconf build-essential libavahi-client-dev \
+         libgnutls28-dev libkrb5-dev libnss-mdns libpam-dev \
+         libsystemd-dev libusb-1.0-0-dev zlib1g-dev
+
 Also, please note that CUPS does not include print filters to support PDF or
 raster printing.  You *must* download GPL Ghostscript and/or the Open Printing
 CUPS filters package separately to print on operating systems other than macOS.
diff --git a/config-scripts/cups-opsys.m4 b/config-scripts/cups-opsys.m4
index 42fbe801b..d85454783 100644
--- a/config-scripts/cups-opsys.m4
+++ b/config-scripts/cups-opsys.m4
@@ -17,6 +17,10 @@ AC_CANONICAL_HOST
 
 [host_os_name=`echo $host_os | sed -e '1,$s/[0-9.]*$//g'`]
 [host_os_version=`echo $host_os | sed -e '1,$s/^[^0-9.]*//g' | awk -F. '{print $1 $2}'`]
+# Linux often does not yield an OS version we can use...
+if test "x$host_os_version" = x; then
+        host_os_version="0"
+fi
 
 if test "$host_os_name" = darwin -a $host_os_version -lt 120; then
         AC_MSG_ERROR([Sorry, this version of CUPS requires macOS 10.8 or higher.])
diff --git a/configure b/configure
index 5ebc81e7e..74f67a587 100755
--- a/configure
+++ b/configure
@@ -2637,6 +2637,12 @@ case $host_os in *\ *) host_os=`echo "$host_os" | sed 's/ /-/g'`;; esac
 
 host_os_name=`echo $host_os | sed -e '1,$s/[0-9.]*$//g'`
 host_os_version=`echo $host_os | sed -e '1,$s/^[^0-9.]*//g' | awk -F. '{print $1 $2}'`
+if test "x$host_os_version" = x; then
+        host_os_version="0"
+fi
+echo "host_os=$host_os"
+echo "host_os_name=$host_os_name"
+echo "host_os_version=$host_os_version"
 
 if test "$host_os_name" = darwin -a $host_os_version -lt 120; then
         as_fn_error $? "Sorry, this version of CUPS requires macOS 10.8 or higher." "$LINENO" 5
@@ -9491,6 +9497,7 @@ fi
 if test "${with_bundledir+set}" = set; then :
   withval=$with_bundledir; CUPS_BUNDLEDIR="$withval"
 else
+  echo "host_os_version=$host_os_version"
   if test "x$host_os_name" = xdarwin -a $host_os_version -ge 100; then
 		CUPS_BUNDLEDIR="/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/PrintCore.framework/Versions/A"
 		LANGUAGES=""