gentoo-overlay/app-text/pdf2html/files/pdf2html-1.4-libpng15.patch

--- a/pbm2png.c
+++ b/pbm2png.c
@@ -23,6 +23,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <zlib.h> /* Z_BEST_COMPRESSION */
 #include <png.h>
 #include <sys/types.h>
 #include <sys/stat.h>