Update to Autoconf v2 macro names.

diff --git a/configure.in b/configure.in
index 5d4411b..4456254 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -1,13 +1,22 @@
 dnl Process this file with autoconf to produce a configure script.
 AC_INIT(reduce.c)
+
+dnl Checks for programs.
 AC_PROG_CC
-AC_PROG_CPP
 AC_PROG_INSTALL
+
 AC_MINIX
 AC_ISC_POSIX
-AC_CONST
-AC_STDC_HEADERS
-AC_HAVE_HEADERS(string.h stdlib.h memory.h)
-AC_HAVE_FUNCS(strerror)
-AC_ALLOCA
+
+dnl Checks for header files.
+AC_HEADER_STDC
+AC_CHECK_HEADERS(string.h stdlib.h memory.h)
+
+dnl Checks for typedefs, structures, and compiler characteristics.
+AC_C_CONST
+
+dnl Checks for library functions.
+AC_FUNC_ALLOCA
+AC_CHECK_FUNCS(strerror)
+
 AC_OUTPUT(Makefile)