diff -Naur fitsio-1.0.1/setup.py fitsio-1.0.1.patched/setup.py
--- fitsio-1.0.1/setup.py	2019-04-18 15:14:43.000000000 +0200
+++ fitsio-1.0.1.patched/setup.py	2019-04-28 13:18:34.280560623 +0200
@@ -31,9 +31,9 @@
     cfitsio_dir = 'cfitsio%s' % cfitsio_version
 
     def initialize_options(self):
-        self.use_system_fitsio = False
-        self.system_fitsio_includedir = None
-        self.system_fitsio_libdir = None
+        self.use_system_fitsio = True 
+        self.system_fitsio_includedir = "@INCLUDEDIR@"
+        self.system_fitsio_libdir = "@LIBDIR@"
         build_ext.initialize_options(self)
 
     def finalize_options(self):