--- app-misc/screen/screen-4.5.1.ebuild~	2017-02-26 12:16:50.000000000 +0000
+++ app-misc/screen/screen-4.5.1.ebuild	2017-02-27 18:56:18.690898504 +0000
@@ -66,6 +66,9 @@
 		sed -i -e '/^#define UTMPOK/s/define/undef/' acconfig.h || die
 	fi
 
+	# Fix parallel make (#611130).
+	sed -i -e 's|^install_bin:.*$|\0 installdirs|' Makefile.in || die
+
 	# reconfigure
 	eautoreconf
 }