Add workaround to enable pip install in older Ubuntu

aa5b93b4 · Adel Kara Slimane · e7b2175a · aa5b93b4 · aa5b93b4
Verified Commit aa5b93b4 authored May 21, 2020 by Adel Kara Slimane
--- a/MANIFEST.in
+++ b/MANIFEST.in
+include pyproject.toml
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--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,4 +9,6 @@ requires = ["setuptools>=42",
            "cython>=0.21.1",
            "kwant"]

+build-backend = 'setuptools.build_meta'
+
 [tool.setuptools_scm]
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