Undefined symbols for architecture x86_64: _pam_syslog

[ 92%] Linking C shared module pam_user_map.so

Undefined symbols for architecture x86_64:

  "_pam_syslog", referenced from:

      _pam_sm_authenticate in pam_user_map.c.o

ld: symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

make[2]: *** [plugin/auth_pam/pam_user_map.so] Error 1

make[1]: *** [plugin/auth_pam/CMakeFiles/pam_user_map.dir/all] Error 2

make: *** [all] Error 2

diff --git a/plugin/auth_pam/mapper/pam_user_map.c b/plugin/auth_pam/mapper/pam_user_map.c

index e1d11acabb9..83a7626b427 100644

--- a/plugin/auth_pam/mapper/pam_user_map.c

+++ b/plugin/auth_pam/mapper/pam_user_map.c

@@ -39,7 +39,11 @@ and usually end up in /var/log/secure file.

 #include <grp.h>

 #include <pwd.h>

+#if defined (__APPLE__) || defined (__FreeBSD__)

+#include <unistd.h>

+#include <security/pam_appl.h>

+#else

 #include <security/pam_ext.h>

+#endif

 #include <security/pam_modules.h>

 #define FILENAME "/etc/security/user_map.conf"