diff --git a/Jenkinsfile b/Jenkinsfile
index fcec8ed..cbfa2fc 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -10,12 +10,12 @@ pipeline {
 
         stage('Build the code and generate tests results...') {
             steps {
-                sh '. ./ci_venv/bin/activate && make -C src results VERBOSE=1'
+                sh '. ./ci_venv/bin/activate && make -C src results VERBOSE=1 PYTHONPATH=$PWD/src'
             }
         }
         stage('Create a setup file...') {
             steps {
-                sh '. ~/.profile && make selfex VERBOSE=1'
+                sh '. ~/.profile && make selfex VERBOSE=1 PYTHONPATH=$PWD/src'
             }
         }
         stage('Test installation...') {
diff --git a/src/msspec/phagen/fortran/Makefile b/src/msspec/phagen/fortran/Makefile
index 6665315..19a4272 100644
--- a/src/msspec/phagen/fortran/Makefile
+++ b/src/msspec/phagen/fortran/Makefile
@@ -17,13 +17,12 @@ endif
 
 .PHONY: clean
 
-pybinding: libphagen
+pybinding: libphagen.target
 
-libphagen: $(objects) main.f
+libphagen.target: $(objects) main.f
 	@echo "building Python binding..."      
 	@$(F2PY) -I. $(objects) $(F2PY_OPTS)-c -m libphagen main.f
-#	@cp libphagen.cpython*.so ../                                                 
-#	@mv libphagen.cpython*.so libphagen.so
+	@touch $@
 
 $(objects): $(objects_src)
 	@echo "compiling subroutines and functions for phagen..."
@@ -32,3 +31,5 @@ $(objects): $(objects_src)
 clean:
 	@echo "cleaning..."                                               
 	@rm -rf *.o *.mod
+	@rm -rf $(objects)
+	@rm -f libphagen.target