+AC_CHECK_PROGS(MD5SUM_SIMPLE, md5sum md5 gmd5sum)
+
+CFLAGS="$CFLAGS -D_GNU_SOURCE"
+
+AC_CHECK_LIB(socket,socket)
+AC_CHECK_FUNCS(setenv strsignal)
+
+AC_CACHE_CHECK(for EPROTO,userv_cv_hdr_eproto,
+ AC_EGREP_CPP(yes,
+[
+#include <errno.h>
+#ifdef EPROTO
+ yes
+#endif
+],userv_cv_hdr_eproto=yes,userv_cv_hdr_eproto=no))
+if test $userv_cv_hdr_eproto = yes
+then
+ AC_DEFINE(HAVE_EPROTO)
+fi
+
+AC_CACHE_CHECK(for LOG_AUTHPRIV,userv_cv_hdr_logauthpriv,
+ AC_EGREP_CPP(yes,
+[
+#include <syslog.h>
+#ifdef LOG_AUTHPRIV
+ yes
+#endif
+],userv_cv_hdr_logauthpriv=yes,userv_cv_hdr_logauthpriv=no))
+if test $userv_cv_hdr_logauthpriv = yes
+then
+ AC_DEFINE(HAVE_LOG_AUTHPRIV)
+fi
+
+AC_CACHE_CHECK(for WCOREDUMP,userv_cv_hdr_wcoredump,
+ AC_EGREP_CPP(yes,
+[
+#include <syslog.h>
+#ifdef WCOREDUMP
+ yes
+#endif
+],userv_cv_hdr_wcoredump=yes,userv_cv_hdr_wcoredump=no))
+if test $userv_cv_hdr_wcoredump = yes
+then
+ AC_DEFINE(HAVE_WCOREDUMP)
+fi