+/*
+ * Defined always.
+ * FIXME: Don't know what it does or why we need it.
+ * (presumably something to do with ANSI Standard C?)
+ */
+#ifndef __STDC__
+#define __STDC__ 1
+#endif /* ndef __STDC__ */
+
+/*
+ * Need to set up this define only for the Pthreads library for
+ * Win32, available from http://sources.redhat.com/pthreads-win32/
+ */
+#if defined(FEATURE_PTHREAD) && defined(_WIN32)
+#define __CLEANUP_C
+#endif /* defined(FEATURE_PTHREAD) && defined(_WIN32) */
+
+/*
+ * BEOS does not currently support POSIX threads.
+ * This *should* be detected by ./configure, but let's be sure.
+ */
+#if defined(FEATURE_PTHREAD) && defined(__BEOS__)
+#error BEOS does not support pthread - please run ./configure again with "--disable-pthread"
+
+#endif /* defined(FEATURE_PTHREAD) && defined(__BEOS__) */
+
+/*
+ * On OpenBSD and maybe also FreeBSD, gcc doesn't define the cpp
+ * symbol unix; it defines __unix__ and sometimes not even that:
+ */
+#if ( defined(__unix__) || defined(__NetBSD__) ) && !defined(unix)
+#define unix 1
+#endif
+
+/*
+ * It's too easy to accidentally use a Cygwin or MinGW32 version of config.h
+ * under VC++, and it usually gives many wierd error messages. Let's make
+ * the error messages understandable, by bailing out now.
+ */
+#ifdef _MSC_VER
+#error For MS VC++, please use vc_config_winthreads.h or vc_config_pthreads.h. You can usually do this by selecting the "Build", "Clean" menu option.
+#endif /* def _MSC_VER */
+
+#endif /* CONFIG_H_INCLUDED */