--- libpng-1.6.37/libpng-config.in.orig	2019-04-14 20:10:32.000000000 +0200
+++ libpng-1.6.37/libpng-config.in	2020-01-15 19:59:39.773607141 +0100
@@ -19,7 +19,7 @@
 libs="-lpng@PNGLIB_MAJOR@@PNGLIB_MINOR@"
 all_libs="-lpng@PNGLIB_MAJOR@@PNGLIB_MINOR@ @LIBS@"
 I_opts="-I${includedir}"
-L_opts="-L${libdir}"
+L_opts=""
 R_opts=""
 cppflags=""
 ccopts=""