https://bugs.gentoo.org/show_bug.cgi?id=270779
Ported from the texlive-core patch.

Index: src/texk/web2c/cpascal.h
===================================================================
--- src.orig/texk/web2c/cpascal.h
+++ src/texk/web2c/cpascal.h
@@ -14,6 +14,7 @@
 
 /* We must include this first, to resolve many C issues.  */
 #include "config.h"
+#define getline pdftex_getline
 
 /* We only use getopt in the applications, not in web2c itself.  */
 #include <kpathsea/getopt.h>