diff --git a/python/CMakeLists.txt b/python/CMakeLists.txt
index 6045aca..90d3e6e 100644
--- a/python/CMakeLists.txt
+++ b/python/CMakeLists.txt
@@ -50,11 +50,11 @@ if(APPLE)
   set(CMAKE_MODULE_LINKER_FLAGS "-undefined dynamic_lookup")
 endif()
 
-target_link_libraries(_cosmotool ${CosmoTool_local}  ${GSL_LIBRARIES})
-target_link_libraries(_cosmo_power ${CosmoTool_local} ${GSL_LIBRARIES})
-target_link_libraries(_cosmo_cic ${CosmoTool_local}  ${GSL_LIBRARIES})
+target_link_libraries(_cosmotool PRIVATE ${CosmoTool_local}  ${GSL_LIBRARIES})
+target_link_libraries(_cosmo_power PRIVATE ${CosmoTool_local} ${GSL_LIBRARIES})
+target_link_libraries(_cosmo_cic PRIVATE ${CosmoTool_local}  ${GSL_LIBRARIES})
 target_link_libraries(_project )
-target_link_libraries(_fast_interp ${CosmoTool_local} )
+target_link_libraries(_fast_interp PRIVATE ${CosmoTool_local} )
 
 SET(ct_TARGETS   _cosmotool _project _cosmo_power _cosmo_cic _fast_interp )
 
diff --git a/python/_cosmo_power.pyx b/python/_cosmo_power.pyx
index 2d01e72..bf4bd4b 100644
--- a/python/_cosmo_power.pyx
+++ b/python/_cosmo_power.pyx
@@ -81,7 +81,7 @@ cdef class CosmologyPower:
     if 'ns' in cosmo:
       self.power.n = cosmo['ns'] 
     if 'T27' in cosmo:
-      self.power.THETA_27 = cosmo['T27']
+      self.power.Theta_27 = cosmo['T27']
     
     assert self.power.OMEGA_C > 0
     
diff --git a/python/dummy.c b/python/dummy.c
new file mode 100644
index 0000000..ad8787c
--- /dev/null
+++ b/python/dummy.c
@@ -0,0 +1 @@
+static void dummyFunc() {}
diff --git a/setup.py b/setup.py
index a3d1a58..f1cf6d6 100644
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,7 @@ class CMakeExtension(Extension):
     doesn't try to build your sources for you
     """
 
-    def __init__(self, name, sources=[]):
+    def __init__(self, name, sources=["python/dummy.c"]):
 
         super().__init__(name = name, sources = sources)
 
@@ -218,7 +218,7 @@ class BuildCMakeExt(build_ext):
 CosmoTool_extension = CMakeExtension(name="cosmotool")
 
 setup(name='cosmotool',
-      version='1.0.0a2',
+      version='1.0.0a4',
       packages=["cosmotool"],
       package_dir={'cosmotool': 'python/cosmotool'},
       setup_requires=['cython','cffi','numexpr'],