This patch is from Gentoo:
http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/media-gfx/sane-backends/files/sane-backends-1.0.24-systemd_pkgconfig.patch?revision=1.2&view=markup
---
 configure.in | 25 +++++++++++--------------
 1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/configure.in b/configure.in
index 7413646..66828fc 100644
--- a/configure.in
+++ b/configure.in
@@ -347,21 +347,18 @@ dnl fi
 AC_ARG_WITH(systemd,
        AC_HELP_STRING([--with-systemd], [enable systemd support 
@<:@default=yes@:>@]))
 if test "x$with_systemd" != xno ; then
-    dnl added by llagendijk 12/7/2012 to detect systemd for saned
-    $as_echo_n "Checking for systemd..."
-    if test -e /usr/include/systemd/sd-daemon.h ; then
-       AC_DEFINE(HAVE_SYSTEMD, 1, [Is /usr/include/systemd/sd-daemon.h 
available?])
-       have_systemd="yes"
-       SYSTEMD_LIBS=" -lsystemd-daemon"
-       AC_SUBST(SYSTEMD_LIBS)
-       $as_echo "yes"
-    else
-       have_systemd="no"
-       $as_echo "no"
-       if test "x$with_systemd" = xyes; then
-           AC_MSG_ERROR([Systemd support was requested but systemd was not 
found])
-       fi
+  PKG_CHECK_MODULES(SYSTEMD, [libsystemd], have_systemd=yes, have_systemd=no)
+  if test "x$have_systemd" = xno; then
+    PKG_CHECK_MODULES(SYSTEMD, [libsystemd-daemon], have_systemd=yes, 
have_systemd=no)
+  fi
+  if test "x$have_systemd" = xyes; then
+    AC_DEFINE(HAVE_SYSTEMD, 1, [Is /usr/include/systemd/sd-daemon.h 
available?])
+    AC_SUBST(SYSTEMD_LIBS)
+  else
+    if test "x$with_systemd" = xyes; then
+      AC_MSG_ERROR([Systemd support was requested but systemd was not found])
     fi
+  fi
 fi
 
 dnl ***********
-- 
2.2.2


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