diff --git a/Makefile.am b/Makefile.am
index 7fa9118..6c6cd71 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -34,8 +34,9 @@ lib_LTLIBRARIES = pam_yubico.la
 
 pam_yubico_la_SOURCES = pam_yubico.c
 # XXX add -Wl,-x too?  PAM documentation suggests it.
-pam_yubico_la_LIBADD = @LTLIBYKCLIENT@ @LIBLDAP@
+pam_yubico_la_LIBADD = @LTLIBYKCLIENT@ @LIBLDAP@ @YKPERS_LIBS@
 pam_yubico_la_LDFLAGS = -module -avoid-version
+pam_yubico_la_CPPFLAGS = @YKPERS_CFLAGS@
 
 DEFS = -DDEBUG_PAM -DPAM_DEBUG @DEFS@
 
diff --git a/configure.ac b/configure.ac
index a94a989..75858e3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -64,6 +64,8 @@ if test "$ac_cv_libykclient" != yes; then
    AC_MSG_ERROR([[Libykclient v2.4+ required, see http://code.google.com/p/yubico-c-client/]])
 fi
 
+PKG_CHECK_MODULES([YKPERS], [ykpers-1]);
+
 AC_SUBST(PAMDIR, "\$(exec_prefix)/lib/security")
 AC_ARG_WITH(pam-dir,
   AC_HELP_STRING([--with-pam-dir=DIR],