diff --git a/libm/include/complex.h b/libm/include/complex.h
new file mode 100644
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--- /dev/null
+++ b/libm/include/complex.h
@@ -0,0 +1,92 @@
+/*-
+ * Copyright (c) 2001-2011 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
+
+#include <sys/cdefs.h>
+
+#ifdef __GNUC__
+#if __STDC_VERSION__ < 199901
+#define	_Complex	__complex__
+#endif
+#define	_Complex_I	((float _Complex)1.0i)
+#endif
+
+#ifdef __generic
+_Static_assert(__generic(_Complex_I, float _Complex, 1, 0),
+    "_Complex_I must be of type float _Complex");
+#endif
+
+#define	complex		_Complex
+#define	I		_Complex_I
+
+__BEGIN_DECLS
+
+double		cabs(double complex);
+float		cabsf(float complex);
+long double	cabsl(long double complex);
+double		carg(double complex);
+float		cargf(float complex);
+long double	cargl(long double complex);
+double complex	ccos(double complex);
+float complex	ccosf(float complex);
+double complex	ccosh(double complex);
+float complex	ccoshf(float complex);
+double complex	cexp(double complex);
+float complex	cexpf(float complex);
+double		cimag(double complex) __pure2;
+float		cimagf(float complex) __pure2;
+long double	cimagl(long double complex) __pure2;
+double complex	conj(double complex) __pure2;
+float complex	conjf(float complex) __pure2;
+long double complex
+		conjl(long double complex) __pure2;
+float complex	cprojf(float complex) __pure2;
+double complex	cproj(double complex) __pure2;
+long double complex
+		cprojl(long double complex) __pure2;
+double		creal(double complex) __pure2;
+float		crealf(float complex) __pure2;
+long double	creall(long double complex) __pure2;
+double complex	csin(double complex);
+float complex	csinf(float complex);
+double complex	csinh(double complex);
+float complex	csinhf(float complex);
+double complex	csqrt(double complex);
+float complex	csqrtf(float complex);
+long double complex
+		csqrtl(long double complex);
+double complex	ctan(double complex);
+float complex	ctanf(float complex);
+double complex	ctanh(double complex);
+float complex	ctanhf(float complex);
+
+__END_DECLS
+
+#endif /* _COMPLEX_H */