--- setup.py.orig	2018-08-01 13:28:43.609764343 -0600
+++ setup.py	2018-08-01 13:31:04.099897839 -0600
@@ -53,9 +53,11 @@ kwds = dict(include_dirs=[opj("src"),
             extra_compile_args=extra_compile_args,
             define_macros=macros,
             undef_macros=undef_macros)
+parikwds = kwds.copy()
+parikwds['libraries'] = ['pari']
 
 extensions = [
-    Extension("cysignals.signals", ["src/cysignals/signals.pyx"], **kwds),
+    Extension("cysignals.signals", ["src/cysignals/signals.pyx"], **parikwds),
     Extension("cysignals.pysignals", ["src/cysignals/pysignals.pyx"], **kwds),
     Extension("cysignals.alarm", ["src/cysignals/alarm.pyx"], **kwds),
     Extension("cysignals.pselect", ["src/cysignals/pselect.pyx"], **kwds),