# Checks for library functions.
AC_FUNC_STRFTIME
AC_FUNC_STRERROR_R
-AC_CHECK_HEADERS([sys/utsname.h])
-AC_CHECK_FUNCS([strchr strdup strstr timegm gmtime_r strtok_r strcasecmp])
+AC_CHECK_HEADERS([sys/utsname.h grp.h pwd.h])
+AC_CHECK_FUNCS([strchr strdup strstr timegm gmtime_r strtok_r strcasecmp getpwnam getgrnam])
# checks for pthreads
ACX_PTHREAD([enable_threads="pthread"],[enable_threads="no"])