Improve the error message about missing PLY Python package

Previously, only a message about missing Python was printed, which was
misleading to many users.  The new message clearly states that Python
AND PLY is required and prints basic instructions how to install PLY
package.

(cherry picked from commit 55b48700dad6316e64ed2399b955e75881e63b28)

diff --git a/configure b/configure
index ecb7e811e7d181ea047b68c1eb39e0952710593f..3ae0f2210cb8ab4c1966e1bce1bcd4c744a28750 100755 (executable)
--- a/configure
+++ b/configure
@@ -971,6 +971,7 @@ infodir
 docdir
 oldincludedir
 includedir
+runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -1138,6 +1139,7 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
+runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1390,6 +1392,15 @@ do
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;
 
+  -runstatedir | --runstatedir | --runstatedi | --runstated \
+  | --runstate | --runstat | --runsta | --runst | --runs \
+  | --run | --ru | --r)
+    ac_prev=runstatedir ;;
+  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
+  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
+  | --run=* | --ru=* | --r=*)
+    runstatedir=$ac_optarg ;;
+
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1527,7 +1538,7 @@ fi
 for ac_var in  exec_prefix prefix bindir sbindir libexecdir datarootdir \
                datadir sysconfdir sharedstatedir localstatedir includedir \
                oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-               libdir localedir mandir
+               libdir localedir mandir runstatedir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1680,6 +1691,7 @@ Fine tuning of the installation directories:
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]
@@ -12646,7 +12658,7 @@ fi
 $as_echo_n "checking for Python support... " >&6; }
              { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
-             as_fn_error $? "Python required for dnssec-keymgr" "$LINENO" 5
+             as_fn_error $? "Python >= 2.7 or >= 3.2 and the PLY package are required for dnssec-keymgr and other Python-based tools. PLY may be available from your OS package manager as python-ply or python3-ply; it can also be installed via pip. To build without Python/PLY, use --disable-python." "$LINENO" 5
 fi
 fi
 

diff --git a/configure.ac b/configure.ac
index 2ef92cdf454d785360c927a96c1b04e1661cf7a3..320318d362cd9ad52629b5d24d1edb8ca190cdc1 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -310,7 +310,15 @@ AS_IF([test "$with_python" = "no"],
        AS_IF([test "X$PYTHON" = "X"],
             [AC_MSG_CHECKING([for Python support])
              AC_MSG_RESULT([no])
-             AC_MSG_ERROR([Python required for dnssec-keymgr])])])
+             AC_MSG_ERROR([m4_normalize(
+                               [Python >= 2.7 or >= 3.2 and the PLY package
+                                 are required for dnssec-keymgr and other
+                                 Python-based tools. PLY may be
+                                 available from your OS package manager
+                                 as python-ply or python3-ply; it can also
+                                 be installed via pip. To build without
+                                 Python/PLY, use --disable-python.]
+                           )])])])
 
 PYTHON_TOOLS=''
 CHECKDS=''