diff --git a/builder/build-wheels.sh b/builder/build-wheels.sh
index 90f87a9..ac343fe 100755
--- a/builder/build-wheels.sh
+++ b/builder/build-wheels.sh
@@ -8,7 +8,7 @@ export CC CXX
 
 # Install a system package required by our library
 #yum install -y atlas-devel
-yum install -y cmake3 gsl-devel zlib-devel
+yum install -y cmake3 gsl-devel zlib-devel fftw3-devel
 
 ln -fs /usr/bin/cmake3 /usr/bin/cmake
 
@@ -19,17 +19,18 @@ ALL_PYTHON="cp36-cp36m cp37-cp37m cp38-cp38 cp39-cp39"
 for pkg in $ALL_PYTHON; do
     PYBIN=/opt/python/${pkg}/bin
 #    "${PYBIN}/pip" install -r /io/dev-requirements.txt
+    "${PYBIN}/pip" install setuptools wheel Cython 
     "${PYBIN}/pip" install -r /io/requirements.txt
     "${PYBIN}/pip" wheel -vvv /io/ -w wheelhouse/
 done
 
 # Bundle external shared libraries into the wheels
-for whl in wheelhouse/*.whl; do
+for whl in wheelhouse/cosmotool*.whl; do
     auditwheel repair "$whl" --plat $PLAT -w /io/wheelhouse/
 done
 
 # Install packages and test
-for pkg in $ALL_PYTHON; do
-    PYBIN=/opt/python/${pkg}/bin
-    "${PYBIN}/pip" install cosmotool --no-index -f /io/wheelhouse
-done
+#for pkg in $ALL_PYTHON; do
+#    PYBIN=/opt/python/${pkg}/bin
+#    "${PYBIN}/pip" install cosmotool --no-index -f /io/wheelhouse
+#done
diff --git a/python/CMakeLists.txt b/python/CMakeLists.txt
index e2ea884..db4bc17 100644
--- a/python/CMakeLists.txt
+++ b/python/CMakeLists.txt
@@ -54,6 +54,10 @@ SET(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Bsymbolic-functions
 if(APPLE)
   set(CMAKE_MODULE_LINKER_FLAGS "-undefined dynamic_lookup")
 endif()
+IF(NOT APPLE)
+  set(CMAKE_MODULE_LINKER_FLAGS "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/cosmotool.version")
+ENDIF()
+
 
 target_link_libraries(_cosmotool PRIVATE ${CosmoTool_local}  ${GSL_LIBRARIES})
 target_link_libraries(_cosmo_power PRIVATE ${CosmoTool_local} ${GSL_LIBRARIES})
diff --git a/python/cosmotool.version b/python/cosmotool.version
new file mode 100644
index 0000000..fb25144
--- /dev/null
+++ b/python/cosmotool.version
@@ -0,0 +1,7 @@
+CODEABI_1.0 {
+  global:
+    PyInit_*;
+    _init;
+    _fini;
+  local: *;
+};