nixpkgs/pkgs/games/crawl/crawl_purify.patch

diff -ru3 crawl-ref-0.20.1-src-old/crawl-ref/source/Makefile crawl-ref-0.20.1-src-new/crawl-ref/source/Makefile
--- crawl-ref-0.20.1-src-old/crawl-ref/source/Makefile	1970-01-01 03:00:01.000000000 +0300
+++ crawl-ref-0.20.1-src-new/crawl-ref/source/Makefile	2017-07-27 14:45:34.611221571 +0300
@@ -286,13 +286,7 @@
 LIBZ := contrib/install/$(ARCH)/lib/libz.a
 
 ifndef CROSSHOST
-	# FreeBSD keeps all of its userland includes in /usr/local so
-	# look there
-	ifeq ($(uname_S),FreeBSD)
-		SQLITE_INCLUDE_DIR := /usr/local/include
-	else
-		SQLITE_INCLUDE_DIR := /usr/include
-	endif
+	SQLITE_INCLUDE_DIR := ${sqlite}/include
 else
 	# This is totally wrong, works only with some old-style setups, and
 	# on some architectures of Debian/new FHS multiarch -- excluding, for
diff -ru3 crawl-ref-0.20.1-src-old/crawl-ref/source/util/find_font crawl-ref-0.20.1-src-new/crawl-ref/source/util/find_font
--- crawl-ref-0.20.1-src-old/crawl-ref/source/util/find_font	1970-01-01 03:00:01.000000000 +0300
+++ crawl-ref-0.20.1-src-new/crawl-ref/source/util/find_font	2017-07-27 14:44:29.784235540 +0300
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-FONTDIRS="/usr/share/fonts /usr/local/share/fonts /usr/*/lib/X11/fonts"
+FONTDIRS="${fontsPath}/share/fonts"
 
 name=$1
 [ "$name" ] || { echo "Usage: $0 <fontname.ttf>" >&2; exit 100; }
@@ -11,6 +11,6 @@
         for dir in $FONTDIRS; do
             [ -d "$dir" ] && echo "$dir"
         done
-    } | xargs -I% find % \( -type f -o -type l \) -iname "$name" -print \
+    } | xargs -I% find -L % \( -type f -o -type l \) -iname "$name" -print \
       | head -n1
 } 2>/dev/null