1. Use uppercase for `prefix` parameter
`SYSTEMD_CFLAGS` is used elsewhere so `prefix` cannot be lowercase.
https://autotools.info/pkgconfig/pkg_check_modules.html
2. The module name should be `libsystemd`
Previously it will result in the following compile error when building pppd/auth.c:
> /usr/bin/ld: pppd-auth.o: undefined reference to symbol 'sd_notify@@LIBSYSTEMD_209'
> /usr/bin/ld: /usr/lib/libsystemd.so.0: error adding symbols: DSO missing from command line
This is due to missing `-lsystemd-daemon` flag which is provided by `libsystemd-daemon-devel`
package on Debian or `systemd-libs` on ArchLinux. And the proper .pc file in the package is
`libsystemd` not `systemd`.
https://stackoverflow.com/a/
38303241
Signed-off-by: Chocobo1 <Chocobo1@users.noreply.github.com>
AM_COND_IF([WITH_SYSTEMD],
AC_DEFINE([SYSTEMD], 1, [Enable support for systemd notifications]))
AS_IF([test "x${enable_systemd}" = "xyes"], [
- PKG_CHECK_MODULES([systemd], [systemd])])
+ PKG_CHECK_MODULES([SYSTEMD], [libsystemd])])
#
# Enable Callback Protocol Support, disabled by default