--- mupdf-1.8/Makerules
+++ mupdf-1.8/Makerules
@@ -119,6 +119,8 @@
 SYS_JBIG2DEC_LIBS = -ljbig2dec
 SYS_JPEG_LIBS = -ljpeg
 SYS_ZLIB_LIBS = -lz
+SYS_GLFW_CFLAGS = $(shell pkg-config --cflags glfw3 gl)
+SYS_GLFW_LIBS = $(shell pkg-config --libs glfw3 gl)
 
 endif