- Fix #1092: Ubuntu 22.04 Jammy fails to compile unbound 1.20.0; by

adding helpful text for the Python interpreter version and allowing
  the default pkg-config unavailability error message to be shown.
- autoconf.

acx_python.m4

@@ -9,7 +9,7 @@ AC_DEFUN([AC_PYTHON_DEVEL],[
 
         AC_PATH_PROG([PYTHON],[python[$PYTHON_VERSION]])
         if test -z "$PYTHON"; then
-           AC_MSG_ERROR([Cannot find python$PYTHON_VERSION in your system path])
+           AC_MSG_ERROR([Cannot find 'python$PYTHON_VERSION' in your system path. You can use the environment variable 'PYTHON_VERSION=version_number' for an explicit version.])
            PYTHON_VERSION=""
         fi
 

configure

@@ -17625,6 +17625,7 @@ if test "x$enable_systemd" != xno
 then :
 
 
+		have_systemd=no
 
 pkg_failed=no
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for SYSTEMD" >&5
@@ -17684,11 +17685,31 @@ fi
 	# Put the nasty error message in config.log where it belongs
 	echo "$SYSTEMD_PKG_ERRORS" >&5
 
-	have_systemd=no
+	as_fn_error $? "Package requirements (libsystemd) were not met:
+
+$SYSTEMD_PKG_ERRORS
+
+Consider adjusting the PKG_CONFIG_PATH environment variable if you
+installed software in a non-standard prefix.
+
+Alternatively, you may set the environment variables SYSTEMD_CFLAGS
+and SYSTEMD_LIBS to avoid the need to call pkg-config.
+See the pkg-config man page for more details." "$LINENO" 5
 elif test $pkg_failed = untried; then
      	{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
 printf "%s\n" "no" >&6; }
-	have_systemd=no
+	{ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+printf "%s\n" "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "The pkg-config script could not be found or is too old.  Make sure it
+is in your PATH or set the PKG_CONFIG environment variable to the full
+path to pkg-config.
+
+Alternatively, you may set the environment variables SYSTEMD_CFLAGS
+and SYSTEMD_LIBS to avoid the need to call pkg-config.
+See the pkg-config man page for more details.
+
+To get pkg-config, see <http://pkg-config.freedesktop.org/>.
+See \`config.log' for more details" "$LINENO" 5; }
 else
 	SYSTEMD_CFLAGS=$pkg_cv_SYSTEMD_CFLAGS
 	SYSTEMD_LIBS=$pkg_cv_SYSTEMD_LIBS
@@ -17699,6 +17720,7 @@ fi
 		if test "x$have_systemd" != "xyes"
 then :
 
+		have_systemd_daemon=no
 
 pkg_failed=no
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for SYSTEMD_DAEMON" >&5
@@ -17758,11 +17780,31 @@ fi
 	# Put the nasty error message in config.log where it belongs
 	echo "$SYSTEMD_DAEMON_PKG_ERRORS" >&5
 
-	have_systemd_daemon=no
+	as_fn_error $? "Package requirements (libsystemd-daemon) were not met:
+
+$SYSTEMD_DAEMON_PKG_ERRORS
+
+Consider adjusting the PKG_CONFIG_PATH environment variable if you
+installed software in a non-standard prefix.
+
+Alternatively, you may set the environment variables SYSTEMD_DAEMON_CFLAGS
+and SYSTEMD_DAEMON_LIBS to avoid the need to call pkg-config.
+See the pkg-config man page for more details." "$LINENO" 5
 elif test $pkg_failed = untried; then
      	{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
 printf "%s\n" "no" >&6; }
-	have_systemd_daemon=no
+	{ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+printf "%s\n" "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "The pkg-config script could not be found or is too old.  Make sure it
+is in your PATH or set the PKG_CONFIG environment variable to the full
+path to pkg-config.
+
+Alternatively, you may set the environment variables SYSTEMD_DAEMON_CFLAGS
+and SYSTEMD_DAEMON_LIBS to avoid the need to call pkg-config.
+See the pkg-config man page for more details.
+
+To get pkg-config, see <http://pkg-config.freedesktop.org/>.
+See \`config.log' for more details" "$LINENO" 5; }
 else
 	SYSTEMD_DAEMON_CFLAGS=$pkg_cv_SYSTEMD_DAEMON_CFLAGS
 	SYSTEMD_DAEMON_LIBS=$pkg_cv_SYSTEMD_DAEMON_LIBS
@@ -19185,7 +19227,7 @@ fi
 
 
         if test -z "$PYTHON"; then
-           as_fn_error $? "Cannot find python$PYTHON_VERSION in your system path" "$LINENO" 5
+           as_fn_error $? "Cannot find 'python$PYTHON_VERSION' in your system path. You can use the environment variable 'PYTHON_VERSION=version_number' for an explicit version." "$LINENO" 5
            PYTHON_VERSION=""
         fi
 

doc/Changelog

@@ -1,3 +1,8 @@
+19 June 2024: Yorgos
+	- Fix #1092: Ubuntu 22.04 Jammy fails to compile unbound 1.20.0; by
+	  adding helpful text for the Python interpreter version and allowing
+	  the default pkg-config unavailability error message to be shown.
+
 17 June 2024: Wouter
 	- Fix #1091: Build fails with OpenSSL >= 3.0 built with
 	  OPENSSL_NO_DEPRECATED.

systemd.m4

@@ -8,11 +8,13 @@ have_systemd=no
 AS_IF([test "x$enable_systemd" != xno], [
     ifdef([PKG_CHECK_MODULES], [
 	dnl systemd v209 or newer
-	PKG_CHECK_MODULES([SYSTEMD], [libsystemd], [have_systemd=yes], [have_systemd=no])
+	have_systemd=no
+	PKG_CHECK_MODULES([SYSTEMD], [libsystemd], [have_systemd=yes], [])
 	dnl old systemd library
 	AS_IF([test "x$have_systemd" != "xyes"], [
+		have_systemd_daemon=no
 		PKG_CHECK_MODULES([SYSTEMD_DAEMON], [libsystemd-daemon],
-			[have_systemd_daemon=yes], [have_systemd_daemon=no])
+			[have_systemd_daemon=yes], [])
 		AS_IF([test "x$have_systemd_daemon" = "xyes"],
 			[have_systemd=yes])
 	])