Clarify build requirements

[empserver] / configure.ac

diff --git a/configure.ac b/configure.ac
index 4113bc781d2cbad3c80ba18808f9f23a30274a9d..1885981a7ffb862652d8b3fa33e792b2448e5fae 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -32,9 +32,9 @@
 # Process this file with autoconf to produce a configure script.
 
 # Autoconf makes checking for and programming around assorted ancient
-# crap relatively painless.  But why bother?  Just rely on C89 and
-# POSIX, and when something breaks on some oddball machine, see
-# whether it's worth fixing.
+# crap relatively painless.  But why bother?  Just rely on POSIX, and
+# when something breaks on some oddball machine, see whether it's
+# worth fixing.
 
 AC_PREREQ(2.69)
 AC_INIT([Wolfpack Empire],
@@ -46,15 +46,19 @@ AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_HEADERS([config.h])
 
-
 ### Checks for programs
 AC_PROG_AWK
 AC_PROG_INSTALL
 AC_PROG_RANLIB
-AC_PROG_CC
+
+AC_PROG_CC_STDC
 AM_PROG_CC_C_O
 # Private automake macro, tsk, tsk, tsk...
 _AM_DEPENDENCIES(CC)
+AC_DEFINE([_XOPEN_SOURCE], [600],
+         [Request POSIX-1.2001 with XSI Extension])
+# Note: this is after AC_PROG_CC_STDC, because Solaris cc fails with
+# _XOPEN_SOURCE unless switched to C99, which breaks AC_PROG_CC_STDC.
 
 AC_ARG_VAR(NROFF, [nroff command])
 AC_CHECK_PROG(NROFF, groff, [GROFF_NO_SGR= groff -Tascii -U], nroff)
@@ -168,6 +172,7 @@ main(int argc, char *argv[])
 ### Checks for library functions
 
 AC_CHECK_FUNCS(getaddrinfo)
+MY_WORKING_IN6_IS_ADDR_V4MAPPED
 MY_FUNC_MAKECONTEXT