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diff --git a/coro.h b/coro.h
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+/*
+ * Copyright (c) 2001 Marc Alexander Lehmann <pcg@goof.com>
+ * 
+ * Redistribution and use in source and binary forms, with or without modifica-
+ * tion, are permitted provided that the following conditions are met:
+ * 
+ *   1.  Redistributions of source code must retain the above copyright notice,
+ *       this list of conditions and the following disclaimer.
+ * 
+ *   2.  Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ * 
+ *   3.  The name of the author may not be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
+ * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
+ * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
+ * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This library is modelled strictly after Ralf S. Engelschalls article at
+ * http://www.gnu.org/software/pth/rse-pmt.ps.  So most of the credit must
+ * go to Ralf S. Engelschall <rse@engelschall.com>.
+ *
+ * This coroutine library is very much stripped down. You should either
+ * build your own process avstraction using it or - better - just use GNU
+ * Portable Threads, http://www.gnu.org/software/pth/.
+ */
+
+#ifndef CORO_H
+#define CORO_H
+
+typedef void (*coro_func)(void *);
+
+#if defined(WINDOWS)
+# define CORO_LOOSE 1 /* you don't win with windoze */
+#elif defined(HAVE_UCONTEXT_H)
+# define CORO_UCONTEXT 1
+#elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK)
+# define CORO_SJLJ 1
+#else
+error unknown or unsupported architecture
+#endif
+
+#if CORO_UCONTEXT
+
+#include <ucontext.h>
+
+typedef struct {
+  ucontext_t uc;
+} coro_context;
+
+#define coro_transfer(p,n) swapcontext(&((p)->uc), &((n)->uc))
+
+#elif CORO_SJLJ || CORO_LOOSE
+
+#include <setjmp.h>
+
+typedef struct {
+  jmp_buf env;
+} coro_context;
+
+#define coro_transfer(p,n) if (!setjmp ((p)->env)) longjmp ((n)->env, 1)
+
+#endif
+
+void coro_create(coro_context *ctx,
+                 coro_func coro, void *arg,
+                 void *sptr, long ssize);
+
+#endif
+