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diff --git a/libf2c/libF77/z_log.c b/libf2c/libF77/z_log.c
deleted file mode 100644
index 9dcc7f73..00000000
--- a/libf2c/libF77/z_log.c
+++ /dev/null
@@ -1,63 +0,0 @@
-#include "f2c.h"
-
-#ifdef KR_headers
-double log(), f__cabs(), atan2();
-VOID z_log(r, z) doublecomplex *r, *z;
-#else
-#undef abs
-#include "math.h"
-extern double f__cabs(double, double);
-void z_log(doublecomplex *r, doublecomplex *z)
-#endif
-{
-	double s, s0, t, t2, u, v;
-	double zi = z->i, zr = z->r;
-
-	r->i = atan2(zi, zr);
-#ifdef Pre20000310
-	r->r = log( f__cabs( zr, zi ) );
-#else
-	if (zi < 0)
-		zi = -zi;
-	if (zr < 0)
-		zr = -zr;
-	if (zr < zi) {
-		t = zi;
-		zi = zr;
-		zr = t;
-		}
-	t = zi/zr;
-	s = zr * sqrt(1 + t*t);
-	/* now s = f__cabs(zi,zr), and zr = |zr| >= |zi| = zi */
-	if ((t = s - 1) < 0)
-		t = -t;
-	if (t > .01)
-		r->r = log(s);
-	else {
-
-#ifdef Comment
-
-	log(1+x) = x - x^2/2 + x^3/3 - x^4/4 + - ...
-
-		 = x(1 - x/2 + x^2/3 -+...)
-
-	[sqrt(y^2 + z^2) - 1] * [sqrt(y^2 + z^2) + 1] = y^2 + z^2 - 1, so
-
-	sqrt(y^2 + z^2) - 1 = (y^2 + z^2 - 1) / [sqrt(y^2 + z^2) + 1]
-
-#endif /*Comment*/
-
-		t = ((zr*zr - 1.) + zi*zi) / (s + 1);
-		t2 = t*t;
-		s = 1. - 0.5*t;
-		u = v = 1;
-		do {
-			s0 = s;
-			u *= t2;
-			v += 2;
-			s += u/v - t*u/(v+1);
-			} while(s > s0);
-		r->r = s*t;
-		}
-#endif
-	}