diff '--color=auto' -ru libpano13-2.9.22.orig/lmdif.c libpano13-2.9.22/lmdif.c
--- libpano13-2.9.22.orig/lmdif.c	2025-05-25 09:57:52.790672552 +0200
+++ libpano13-2.9.22/lmdif.c	2025-05-25 09:58:26.444542495 +0200
@@ -1222,7 +1222,6 @@
 static double zero = 0.0;
 static double p25 = 0.25;
 static double p5 = 0.5;
-double fabs(), sqrt();
 
 /*
 *     copy r and (q transpose)*b to preserve input and initialize s.
@@ -1416,7 +1415,6 @@
 static double rgiant = 1.304e19;
 static double zero = 0.0;
 static double one = 1.0;
-double fabs(), sqrt();
 
 s1 = zero;
 s2 = zero;