--- lame-3.100/configure.ac
+++ lame-3.100/configure.ac
@@ -17,7 +17,7 @@
 dnl FRONTEND_CFLAGS
 dnl FRONTEND_LDADD
 
-AC_PREREQ(2.69)
+AC_PREREQ([2.69])
 AC_INIT([lame],[3.100],[lame-dev@lists.sf.net])
 AC_CONFIG_SRCDIR([libmp3lame/lame.c])
 AC_LANG([C])
@@ -25,6 +25,8 @@
 dnl check system
 AC_CANONICAL_HOST
 
+AC_CONFIG_MACRO_DIR([m4])
+
 dnl automake
 AM_INIT_AUTOMAKE
 AC_CONFIG_HEADERS([config.h])
@@ -35,11 +37,13 @@
 AH_BOTTOM([#endif /* LAME_CONFIG_H */])
 AM_MAINTAINER_MODE
 AM_MAKE_INCLUDE
+AM_GNU_GETTEXT(external)
+AM_GNU_GETTEXT_VERSION(0.22)
 
 dnl check environment
-AC_AIX
-AC_ISC_POSIX
-AC_MINIX
+AC_USE_SYSTEM_EXTENSIONS
+AC_SEARCH_LIBS([strerror],[cposix])
+AC_USE_SYSTEM_EXTENSIONS
 case $host_os in
   *cygwin* ) CYGWIN=yes;;
          * ) CYGWIN=no;;
@@ -47,7 +51,7 @@
 
 dnl libtool
 # AC_DISABLE_SHARED
-AC_PROG_LIBTOOL
+LT_INIT
 AC_SUBST(LIBTOOL_DEPS)
 CFLAGS="${ac_save_CFLAGS}"
 
@@ -121,8 +125,6 @@
 	AM_WITH_DMALLOC
 fi
 
-dnl Checks for header files.
-AC_HEADER_STDC
 AC_CHECK_HEADERS( \
 		 errno.h \
 		 fcntl.h \
@@ -182,7 +184,12 @@
 	exit 1
 fi
 
-AC_C_LONG_DOUBLE
+AC_TYPE_LONG_DOUBLE_WIDER
+ac_cv_c_long_double=$ac_cv_type_long_double_wider
+if test $ac_cv_c_long_double = yes; then
+  AC_DEFINE([HAVE_LONG_DOUBLE],[1],[Define to 1 if the type 'long double' works and has more range or precision than 'double'.])
+fi
+  
 if test "${ac_cv_c_have_long_double}" = "yes" ; then
 	AC_CHECK_SIZEOF(long double)
 fi
@@ -371,7 +378,20 @@
 fi
 
 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  This macro is obsolete.])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.
+
 
 dnl Checks for library functions.
 AC_FUNC_ALLOCA