Use $PWD consistently

python-flit.spec

@@ -88,14 +88,14 @@ export FLIT_NO_NETWORK=1
 # first, build flit_core with self
 # TODO do it in a less hacky way, this is reconstructed from pyoroject.toml
 cd flit_core
-PYTHONPATH=$(pwd) %{python3} -c 'from flit_core.build_thyself import build_wheel; build_wheel(".")'
+PYTHONPATH=$PWD %{python3} -c 'from flit_core.build_thyself import build_wheel; build_wheel(".")'
 
 # %%py3_install_wheel unfortunately hardcodes installing from dist/
 mkdir ../dist
 mv flit_core-%{version}-py2.py3-none-any.whl ../dist
 cd -
 
-PYTHONPATH=$(pwd):$(pwd)/flit_core %{python3} -m flit build --format wheel
+PYTHONPATH=$PWD:$PWD/flit_core %{python3} -m flit build --format wheel
 
 
 %install