--- mupdf-1.3/Makerules
+++ mupdf-1.3/Makerules
@@ -63,6 +63,8 @@
 SYS_JBIG2DEC_LIBS = -ljbig2dec
 SYS_JPEG_LIBS = -ljpeg
 SYS_ZLIB_LIBS = -lz
+SYS_CURL_CFLAGS = $(shell pkg-config --cflags libcurl)
+SYS_CURL_LIBS = $(shell pkg-config --libs libcurl) -lpthread
 
 endif