generating build/confstruct.ml
  keys.cmi
 wsi/x11/wsi.cmi
 utils.cmi
 utf8syms.cmo
   parser.cmi
   confstruct.cmo
  config.cmo
 uiutils.cmi
 help.cmi
  lablGL/raw.cmi
 glutils.cmi
   lablGL/gl.cmi
  lablGL/glPix.cmi
 lablGL/glTex.cmi
 lablGL/glMisc.cmi
 lablGL/glMat.cmi
 lablGL/glFunc.cmi
 lablGL/glDraw.cmi
 lablGL/glClear.cmi
 lablGL/glArray.cmi
 ffi.cmo
 main.cmi
main.cmo
keys.cmo
wsi/x11/wsi.cmo
utils.cmo
parser.cmo
uiutils.cmo
help.cmo
lablGL/raw.cmo
glutils.cmo
lablGL/gl.cmo
lablGL/glPix.cmo
lablGL/glTex.cmo
lablGL/glMisc.cmo
lablGL/glMat.cmo
lablGL/glFunc.cmo
lablGL/glDraw.cmo
lablGL/glClear.cmo
lablGL/glArray.cmo
link.o
cutils.o
version.o
lablGL/ml_gl.o
lablGL/ml_glarray.o
lablGL/ml_raw.o
wsi/x11/keysym2ucs.o
wsi/x11/xlib.o
linking build/llpp
/usr/bin/ld: /usr/lib/libmupdf-third.a(zip.o): undefined reference to symbol 'deflateInit2_'
/usr/bin/ld: /usr/lib/libz.so: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
File "_none_", line 1:
Error: Error while building custom runtime system
ocamlc -custom str.cma unix.cma -o build/llpp  build/link.o build/cutils.o build/version.o build/lablGL/ml_gl.o build/lablGL/ml_glarray.o build/lablGL/ml_raw.o build/wsi/x11/keysym2ucs.o build/wsi/x11/xlib.o  build/utils.cmo build/keys.cmo build/wsi/x11/wsi.cmo build/utf8syms.cmo build/lablGL/raw.cmo build/lablGL/gl.cmo build/lablGL/glFunc.cmo build/lablGL/glPix.cmo build/lablGL/glDraw.cmo build/lablGL/glArray.cmo build/parser.cmo build/confstruct.cmo build/config.cmo build/ffi.cmo build/glutils.cmo build/lablGL/glMat.cmo build/uiutils.cmo build/help.cmo build/lablGL/glMisc.cmo build/lablGL/glTex.cmo build/lablGL/glClear.cmo build/main.cmo -cclib "-ljbig2dec -lfreetype -lgumbo -lharfbuzz -ljpeg -lopenjp2 -lX11 -lz  -lmupdf -lmupdf-third -lpthread -lGL -lX11" failed
build failed
==> ERROR: A failure occurred in build().
    Aborting...