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diff --git a/include/complex.h b/include/complex.h
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+/*-
+ * Copyright (c) 2001 The FreeBSD Project.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 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 OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _COMPLEX_H
+#define _COMPLEX_H
+
+#ifdef __GNUC__
+#define _Complex	__complex__
+#define _Complex_I	1.0fi
+#endif
+
+#define complex		_Complex
+#define I		_Complex_I
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+double	cabs __P((double complex));
+float	cabsf __P((float complex));
+double	cimag __P((double complex));
+float	cimagf __P((float complex));
+double	creal __P((double complex));
+float	crealf __P((float complex));
+
+__END_DECLS
+
+#ifdef __GNUC__
+#define cimag(z)	(__imag__ (z))
+#define cimagf(z)	(__imag__ (z))
+#define creal(z)	(__real__ (z))
+#define crealf(z)	(__real__ (z))
+#endif
+
+#endif /* _COMPLEX_H */