diff -Naur a/build/libraries.py b/build/libraries.py
--- a/build/libraries.py	2017-08-03 11:26:28.000000000 +0100
+++ b/build/libraries.py	2018-08-29 23:11:04.392981071 +0100
@@ -304,7 +304,7 @@
 class SDL_ttf(Library):
 	libName = 'SDL_ttf'
 	makeName = 'SDL_TTF'
-	header = '<SDL_ttf.h>'
+	header = '<SDL/SDL_ttf.h>'
 	function = 'TTF_OpenFont'
 	dependsOn = ('SDL', 'FREETYPE')