diff --git a/configure.ac b/configure.ac
index d3a8697b..12c3a730 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 # Process this file with autoconf to produce a configure script.
-AC_INIT(STK, 5.0.0, gary.scavone@mcgill.ca, stk)
+AC_INIT([STK],[5.0.0],[gary.scavone@mcgill.ca],[stk])
 AC_CONFIG_AUX_DIR(config)
 AC_CONFIG_SRCDIR(src/Stk.cpp)
 AC_CONFIG_FILES(Makefile src/Makefile projects/demo/Makefile projects/effects/Makefile projects/ragamatic/Makefile projects/examples/Makefile projects/examples/libMakefile projects/eguitar/Makefile)
@@ -20,13 +20,34 @@ if [[ $AR = "no" ]] ; then
 fi
 
 # Checks for header files.
-AC_HEADER_STDC
+m4_warn([obsolete],
+[The preprocessor macro `STDC_HEADERS' is obsolete.
+  Except in unusual embedded environments, you can safely include all
+  ISO C90 headers unconditionally.])dnl
+# Autoupdate added the next two lines to ensure that your configure
+# script's behavior did not change.  They are probably safe to remove.
+AC_CHECK_INCLUDES_DEFAULT
+AC_PROG_EGREP
+
 AC_CHECK_HEADERS(fcntl.h sys/ioctl.h sys/time.h termio.h unistd.h)
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
 AC_TYPE_SIZE_T
-AC_HEADER_TIME
+m4_warn([obsolete],
+[Update your code to rely only on HAVE_SYS_TIME_H,
+then remove this warning and the obsolete code below it.
+All current systems provide time.h; it need not be checked for.
+Not all systems provide sys/time.h, but those that do, all allow
+you to include it and time.h simultaneously.])dnl
+AC_CHECK_HEADERS_ONCE([sys/time.h])
+# Obsolete code to be removed.
+if test $ac_cv_header_sys_time_h = yes; then
+  AC_DEFINE([TIME_WITH_SYS_TIME],[1],[Define to 1 if you can safely include both <sys/time.h>
+	     and <time.h>.  This macro is obsolete.])
+fi
+# End of obsolete code.
+
 AC_C_BIGENDIAN
 AC_EGREP_CPP(yes,
 [#ifndef WORDS_BIGENDIAN