diff --git a/build/pkgs/alabaster/install-requires.txt b/build/pkgs/alabaster/install-requires.txt
new file mode 100644
index 00000000000..c68d8cbbee9
--- /dev/null
+++ b/build/pkgs/alabaster/install-requires.txt
@@ -0,0 +1 @@
+alabaster >=0.7.12
diff --git a/build/pkgs/appnope/install-requires.txt b/build/pkgs/appnope/install-requires.txt
new file mode 100644
index 00000000000..bb4c8163415
--- /dev/null
+++ b/build/pkgs/appnope/install-requires.txt
@@ -0,0 +1 @@
+appnope >=0.1.0
diff --git a/build/pkgs/attrs/install-requires.txt b/build/pkgs/attrs/install-requires.txt
new file mode 100644
index 00000000000..22ee8c748ef
--- /dev/null
+++ b/build/pkgs/attrs/install-requires.txt
@@ -0,0 +1 @@
+attrs >=19.3.0
diff --git a/build/pkgs/babel/install-requires.txt b/build/pkgs/babel/install-requires.txt
new file mode 100644
index 00000000000..1d0d6191bb9
--- /dev/null
+++ b/build/pkgs/babel/install-requires.txt
@@ -0,0 +1 @@
+babel >=2.6.0
diff --git a/build/pkgs/backcall/install-requires.txt b/build/pkgs/backcall/install-requires.txt
new file mode 100644
index 00000000000..077e71c1e38
--- /dev/null
+++ b/build/pkgs/backcall/install-requires.txt
@@ -0,0 +1 @@
+backcall >=0.1.0
diff --git a/build/pkgs/bleach/install-requires.txt b/build/pkgs/bleach/install-requires.txt
new file mode 100644
index 00000000000..49c810a0dcb
--- /dev/null
+++ b/build/pkgs/bleach/install-requires.txt
@@ -0,0 +1 @@
+bleach >=3.1.5
diff --git a/build/pkgs/certifi/install-requires.txt b/build/pkgs/certifi/install-requires.txt
new file mode 100644
index 00000000000..711e9891792
--- /dev/null
+++ b/build/pkgs/certifi/install-requires.txt
@@ -0,0 +1 @@
+certifi >=2020.6.20
diff --git a/build/pkgs/cffi/install-requires.txt b/build/pkgs/cffi/install-requires.txt
new file mode 100644
index 00000000000..327ffe17f72
--- /dev/null
+++ b/build/pkgs/cffi/install-requires.txt
@@ -0,0 +1 @@
+cffi >=1.14.0
diff --git a/build/pkgs/cvxopt/install-requires.txt b/build/pkgs/cvxopt/install-requires.txt
new file mode 100644
index 00000000000..2a2844dda6e
--- /dev/null
+++ b/build/pkgs/cvxopt/install-requires.txt
@@ -0,0 +1 @@
+cvxopt >=1.2.5
diff --git a/build/pkgs/cycler/install-requires.txt b/build/pkgs/cycler/install-requires.txt
new file mode 100644
index 00000000000..4071e1db5d7
--- /dev/null
+++ b/build/pkgs/cycler/install-requires.txt
@@ -0,0 +1 @@
+cycler >=0.10.0
diff --git a/build/pkgs/cypari/install-requires.txt b/build/pkgs/cypari/install-requires.txt
new file mode 100644
index 00000000000..0e39055cdb2
--- /dev/null
+++ b/build/pkgs/cypari/install-requires.txt
@@ -0,0 +1 @@
+cypari >=2.1.1
diff --git a/build/pkgs/cysignals/install-requires.txt b/build/pkgs/cysignals/install-requires.txt
new file mode 100644
index 00000000000..ed9219d6ee5
--- /dev/null
+++ b/build/pkgs/cysignals/install-requires.txt
@@ -0,0 +1 @@
+cysignals >=1.10.2
diff --git a/build/pkgs/cython/install-requires.txt b/build/pkgs/cython/install-requires.txt
new file mode 100644
index 00000000000..b8a968fa247
--- /dev/null
+++ b/build/pkgs/cython/install-requires.txt
@@ -0,0 +1 @@
+cython >=0.29.21, <1.0
diff --git a/build/pkgs/dateutil/install-requires.txt b/build/pkgs/dateutil/install-requires.txt
new file mode 100644
index 00000000000..0ae93da485e
--- /dev/null
+++ b/build/pkgs/dateutil/install-requires.txt
@@ -0,0 +1 @@
+dateutil >=2.8.1
diff --git a/build/pkgs/decorator/install-requires.txt b/build/pkgs/decorator/install-requires.txt
new file mode 100644
index 00000000000..3576302cd63
--- /dev/null
+++ b/build/pkgs/decorator/install-requires.txt
@@ -0,0 +1 @@
+decorator >=4.4.0
diff --git a/build/pkgs/defusedxml/install-requires.txt b/build/pkgs/defusedxml/install-requires.txt
new file mode 100644
index 00000000000..308a4c62ada
--- /dev/null
+++ b/build/pkgs/defusedxml/install-requires.txt
@@ -0,0 +1 @@
+defusedxml >=0.6.0
diff --git a/build/pkgs/docutils/install-requires.txt b/build/pkgs/docutils/install-requires.txt
new file mode 100644
index 00000000000..ddfd349c248
--- /dev/null
+++ b/build/pkgs/docutils/install-requires.txt
@@ -0,0 +1 @@
+docutils >=0.14
diff --git a/build/pkgs/dot2tex/install-requires.txt b/build/pkgs/dot2tex/install-requires.txt
new file mode 100644
index 00000000000..857ad28259a
--- /dev/null
+++ b/build/pkgs/dot2tex/install-requires.txt
@@ -0,0 +1 @@
+dot2tex >=2.11.3
diff --git a/build/pkgs/entrypoints/install-requires.txt b/build/pkgs/entrypoints/install-requires.txt
new file mode 100644
index 00000000000..e6f3e5ab870
--- /dev/null
+++ b/build/pkgs/entrypoints/install-requires.txt
@@ -0,0 +1 @@
+entrypoints >=0.3
diff --git a/build/pkgs/fpylll/install-requires.txt b/build/pkgs/fpylll/install-requires.txt
new file mode 100644
index 00000000000..db2620d8444
--- /dev/null
+++ b/build/pkgs/fpylll/install-requires.txt
@@ -0,0 +1 @@
+fpylll >=0.5.1dev
diff --git a/build/pkgs/gap_jupyter/install-requires.txt b/build/pkgs/gap_jupyter/install-requires.txt
new file mode 100644
index 00000000000..c3c0b5aa76e
--- /dev/null
+++ b/build/pkgs/gap_jupyter/install-requires.txt
@@ -0,0 +1 @@
+gap_jupyter >=0.9
diff --git a/build/pkgs/gmpy2/install-requires.txt b/build/pkgs/gmpy2/install-requires.txt
new file mode 100644
index 00000000000..fc36c408dd0
--- /dev/null
+++ b/build/pkgs/gmpy2/install-requires.txt
@@ -0,0 +1 @@
+gmpy2 >=2.1.0b5
diff --git a/build/pkgs/html5lib/install-requires.txt b/build/pkgs/html5lib/install-requires.txt
new file mode 100644
index 00000000000..f71f129272c
--- /dev/null
+++ b/build/pkgs/html5lib/install-requires.txt
@@ -0,0 +1 @@
+html5lib >=1.0.1
diff --git a/build/pkgs/imagesize/install-requires.txt b/build/pkgs/imagesize/install-requires.txt
new file mode 100644
index 00000000000..c36e90710f3
--- /dev/null
+++ b/build/pkgs/imagesize/install-requires.txt
@@ -0,0 +1 @@
+imagesize >=1.1.0
diff --git a/build/pkgs/importlib_metadata/install-requires.txt b/build/pkgs/importlib_metadata/install-requires.txt
new file mode 100644
index 00000000000..715fbb76b3a
--- /dev/null
+++ b/build/pkgs/importlib_metadata/install-requires.txt
@@ -0,0 +1 @@
+importlib_metadata >=1.7.0
diff --git a/build/pkgs/ipykernel/install-requires.txt b/build/pkgs/ipykernel/install-requires.txt
new file mode 100644
index 00000000000..5ceec358940
--- /dev/null
+++ b/build/pkgs/ipykernel/install-requires.txt
@@ -0,0 +1 @@
+ipykernel >=5.2.1
diff --git a/build/pkgs/ipython/install-requires.txt b/build/pkgs/ipython/install-requires.txt
new file mode 100644
index 00000000000..a52df49c421
--- /dev/null
+++ b/build/pkgs/ipython/install-requires.txt
@@ -0,0 +1 @@
+ipython >=7.13.0
diff --git a/build/pkgs/ipython_genutils/install-requires.txt b/build/pkgs/ipython_genutils/install-requires.txt
new file mode 100644
index 00000000000..d65757ae105
--- /dev/null
+++ b/build/pkgs/ipython_genutils/install-requires.txt
@@ -0,0 +1 @@
+ipython_genutils >=0.2.0
diff --git a/build/pkgs/ipywidgets/install-requires.txt b/build/pkgs/ipywidgets/install-requires.txt
new file mode 100644
index 00000000000..1e974c72842
--- /dev/null
+++ b/build/pkgs/ipywidgets/install-requires.txt
@@ -0,0 +1 @@
+ipywidgets >=7.5.1
diff --git a/build/pkgs/itsdangerous/SPKG.rst b/build/pkgs/itsdangerous/SPKG.rst
deleted file mode 100644
index 51e0b6f16c9..00000000000
--- a/build/pkgs/itsdangerous/SPKG.rst
+++ /dev/null
@@ -1,8 +0,0 @@
-itsdangerous
-============
-
-Description
------------
-
-Various helpers to pass data to untrusted environments and to get it
-back safe and sound.
diff --git a/build/pkgs/itsdangerous/checksums.ini b/build/pkgs/itsdangerous/checksums.ini
deleted file mode 100644
index 14d3371ae83..00000000000
--- a/build/pkgs/itsdangerous/checksums.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-tarball=itsdangerous-VERSION.tar.gz
-sha1=b79fef5caacdd247f7def3fe59e6def34bc86905
-md5=9b7f5afa7f1e3acfb7786eeca3d99307
-cksum=1586818548
diff --git a/build/pkgs/itsdangerous/dependencies b/build/pkgs/itsdangerous/dependencies
deleted file mode 100644
index 15df0c4d6d8..00000000000
--- a/build/pkgs/itsdangerous/dependencies
+++ /dev/null
@@ -1,5 +0,0 @@
-$(PYTHON) | $(PYTHON_TOOLCHAIN)
-
-----------
-All lines of this file are ignored except the first.
-It is copied by SAGE_ROOT/build/make/install into SAGE_ROOT/build/make/Makefile.
diff --git a/build/pkgs/itsdangerous/package-version.txt b/build/pkgs/itsdangerous/package-version.txt
deleted file mode 100644
index 9084fa2f716..00000000000
--- a/build/pkgs/itsdangerous/package-version.txt
+++ /dev/null
@@ -1 +0,0 @@
-1.1.0
diff --git a/build/pkgs/itsdangerous/spkg-install.in b/build/pkgs/itsdangerous/spkg-install.in
deleted file mode 100644
index deba1bb42bb..00000000000
--- a/build/pkgs/itsdangerous/spkg-install.in
+++ /dev/null
@@ -1 +0,0 @@
-cd src && sdh_pip_install .
diff --git a/build/pkgs/itsdangerous/type b/build/pkgs/itsdangerous/type
deleted file mode 100644
index a6a7b9cd726..00000000000
--- a/build/pkgs/itsdangerous/type
+++ /dev/null
@@ -1 +0,0 @@
-standard
diff --git a/build/pkgs/jedi/install-requires.txt b/build/pkgs/jedi/install-requires.txt
new file mode 100644
index 00000000000..6d0470a09b9
--- /dev/null
+++ b/build/pkgs/jedi/install-requires.txt
@@ -0,0 +1 @@
+jedi >=0.17.0
diff --git a/build/pkgs/jinja2/install-requires.txt b/build/pkgs/jinja2/install-requires.txt
new file mode 100644
index 00000000000..99d8e6ecd6e
--- /dev/null
+++ b/build/pkgs/jinja2/install-requires.txt
@@ -0,0 +1 @@
+jinja2 >=2.11.2
diff --git a/build/pkgs/jsonschema/install-requires.txt b/build/pkgs/jsonschema/install-requires.txt
new file mode 100644
index 00000000000..904caddfed0
--- /dev/null
+++ b/build/pkgs/jsonschema/install-requires.txt
@@ -0,0 +1 @@
+jsonschema >=3.2.0
diff --git a/build/pkgs/jupymake/install-requires.txt b/build/pkgs/jupymake/install-requires.txt
new file mode 100644
index 00000000000..1dd2696b032
--- /dev/null
+++ b/build/pkgs/jupymake/install-requires.txt
@@ -0,0 +1 @@
+jupymake >=0.9
diff --git a/build/pkgs/jupyter_client/install-requires.txt b/build/pkgs/jupyter_client/install-requires.txt
new file mode 100644
index 00000000000..db02ea315bb
--- /dev/null
+++ b/build/pkgs/jupyter_client/install-requires.txt
@@ -0,0 +1 @@
+jupyter_client >=6.1.6
diff --git a/build/pkgs/jupyter_core/install-requires.txt b/build/pkgs/jupyter_core/install-requires.txt
new file mode 100644
index 00000000000..a0e9af65ff5
--- /dev/null
+++ b/build/pkgs/jupyter_core/install-requires.txt
@@ -0,0 +1 @@
+jupyter_core >=4.6.3
diff --git a/build/pkgs/kiwisolver/install-requires.txt b/build/pkgs/kiwisolver/install-requires.txt
new file mode 100644
index 00000000000..7e22e0c9668
--- /dev/null
+++ b/build/pkgs/kiwisolver/install-requires.txt
@@ -0,0 +1 @@
+kiwisolver >=1.0.1
diff --git a/build/pkgs/markupsafe/install-requires.txt b/build/pkgs/markupsafe/install-requires.txt
new file mode 100644
index 00000000000..331f488e6a0
--- /dev/null
+++ b/build/pkgs/markupsafe/install-requires.txt
@@ -0,0 +1 @@
+markupsafe >=1.1.0
diff --git a/build/pkgs/matplotlib/install-requires.txt b/build/pkgs/matplotlib/install-requires.txt
new file mode 100644
index 00000000000..f7df93add3d
--- /dev/null
+++ b/build/pkgs/matplotlib/install-requires.txt
@@ -0,0 +1 @@
+matplotlib >=3.3.1
diff --git a/build/pkgs/mistune/install-requires.txt b/build/pkgs/mistune/install-requires.txt
new file mode 100644
index 00000000000..be0cd7a3adc
--- /dev/null
+++ b/build/pkgs/mistune/install-requires.txt
@@ -0,0 +1 @@
+mistune >=0.8.4
diff --git a/build/pkgs/mpmath/install-requires.txt b/build/pkgs/mpmath/install-requires.txt
new file mode 100644
index 00000000000..fca72908c4f
--- /dev/null
+++ b/build/pkgs/mpmath/install-requires.txt
@@ -0,0 +1 @@
+mpmath >=1.1.0
diff --git a/build/pkgs/nbconvert/install-requires.txt b/build/pkgs/nbconvert/install-requires.txt
new file mode 100644
index 00000000000..9d1f75d7a85
--- /dev/null
+++ b/build/pkgs/nbconvert/install-requires.txt
@@ -0,0 +1 @@
+nbconvert >=5.6.1
diff --git a/build/pkgs/nbformat/install-requires.txt b/build/pkgs/nbformat/install-requires.txt
new file mode 100644
index 00000000000..a42ba3e62f8
--- /dev/null
+++ b/build/pkgs/nbformat/install-requires.txt
@@ -0,0 +1 @@
+nbformat >=5.0.7
diff --git a/build/pkgs/networkx/install-requires.txt b/build/pkgs/networkx/install-requires.txt
new file mode 100644
index 00000000000..e3166309288
--- /dev/null
+++ b/build/pkgs/networkx/install-requires.txt
@@ -0,0 +1,2 @@
+# gentoo uses 2.5
+networkx >=2.4, <2.6
diff --git a/build/pkgs/nose/install-requires.txt b/build/pkgs/nose/install-requires.txt
new file mode 100644
index 00000000000..2e10ae2a3b2
--- /dev/null
+++ b/build/pkgs/nose/install-requires.txt
@@ -0,0 +1 @@
+nose >=1.3.7
diff --git a/build/pkgs/notebook/install-requires.txt b/build/pkgs/notebook/install-requires.txt
new file mode 100644
index 00000000000..d5b61535538
--- /dev/null
+++ b/build/pkgs/notebook/install-requires.txt
@@ -0,0 +1 @@
+notebook >=6.1.1
diff --git a/build/pkgs/notedown/install-requires.txt b/build/pkgs/notedown/install-requires.txt
new file mode 100644
index 00000000000..1e18b09485d
--- /dev/null
+++ b/build/pkgs/notedown/install-requires.txt
@@ -0,0 +1 @@
+notedown >=1.5.1
diff --git a/build/pkgs/numpy/install-requires.txt b/build/pkgs/numpy/install-requires.txt
new file mode 100644
index 00000000000..45127ae0a86
--- /dev/null
+++ b/build/pkgs/numpy/install-requires.txt
@@ -0,0 +1 @@
+numpy >=1.19
diff --git a/build/pkgs/p_group_cohomology/install-requires.txt b/build/pkgs/p_group_cohomology/install-requires.txt
new file mode 100644
index 00000000000..e1974f06114
--- /dev/null
+++ b/build/pkgs/p_group_cohomology/install-requires.txt
@@ -0,0 +1 @@
+p_group_cohomology >=3.3
diff --git a/build/pkgs/packaging/install-requires.txt b/build/pkgs/packaging/install-requires.txt
new file mode 100644
index 00000000000..564ba90b0a5
--- /dev/null
+++ b/build/pkgs/packaging/install-requires.txt
@@ -0,0 +1 @@
+packaging >=18.0
diff --git a/build/pkgs/pandoc_attributes/install-requires.txt b/build/pkgs/pandoc_attributes/install-requires.txt
new file mode 100644
index 00000000000..f941682354a
--- /dev/null
+++ b/build/pkgs/pandoc_attributes/install-requires.txt
@@ -0,0 +1 @@
+pandoc_attributes >=8bc82f6d
diff --git a/build/pkgs/pandocfilters/install-requires.txt b/build/pkgs/pandocfilters/install-requires.txt
new file mode 100644
index 00000000000..c2883fe15e4
--- /dev/null
+++ b/build/pkgs/pandocfilters/install-requires.txt
@@ -0,0 +1 @@
+pandocfilters >=1.4.2
diff --git a/build/pkgs/pari_jupyter/install-requires.txt b/build/pkgs/pari_jupyter/install-requires.txt
new file mode 100644
index 00000000000..137bc4b961c
--- /dev/null
+++ b/build/pkgs/pari_jupyter/install-requires.txt
@@ -0,0 +1 @@
+pari_jupyter >=1.3.2
diff --git a/build/pkgs/parso/install-requires.txt b/build/pkgs/parso/install-requires.txt
new file mode 100644
index 00000000000..91c0b250f01
--- /dev/null
+++ b/build/pkgs/parso/install-requires.txt
@@ -0,0 +1 @@
+parso >=0.7.0
diff --git a/build/pkgs/pexpect/install-requires.txt b/build/pkgs/pexpect/install-requires.txt
new file mode 100644
index 00000000000..e89d50d66c3
--- /dev/null
+++ b/build/pkgs/pexpect/install-requires.txt
@@ -0,0 +1 @@
+pexpect >=4.8.0
diff --git a/build/pkgs/pickleshare/install-requires.txt b/build/pkgs/pickleshare/install-requires.txt
new file mode 100644
index 00000000000..a1ea57f556a
--- /dev/null
+++ b/build/pkgs/pickleshare/install-requires.txt
@@ -0,0 +1 @@
+pickleshare >=0.7.5
diff --git a/build/pkgs/pillow/install-requires.txt b/build/pkgs/pillow/install-requires.txt
new file mode 100644
index 00000000000..7dbe09f5f5c
--- /dev/null
+++ b/build/pkgs/pillow/install-requires.txt
@@ -0,0 +1 @@
+pillow >=7.2.0
diff --git a/build/pkgs/pip/install-requires.txt b/build/pkgs/pip/install-requires.txt
new file mode 100644
index 00000000000..acce94d1684
--- /dev/null
+++ b/build/pkgs/pip/install-requires.txt
@@ -0,0 +1 @@
+pip >=20.2.3
diff --git a/build/pkgs/pkgconfig/install-requires.txt b/build/pkgs/pkgconfig/install-requires.txt
new file mode 100644
index 00000000000..afa452604e3
--- /dev/null
+++ b/build/pkgs/pkgconfig/install-requires.txt
@@ -0,0 +1 @@
+pkgconfig >=1.5.1
diff --git a/build/pkgs/pplpy/install-requires.txt b/build/pkgs/pplpy/install-requires.txt
new file mode 100644
index 00000000000..d4ba9b3897c
--- /dev/null
+++ b/build/pkgs/pplpy/install-requires.txt
@@ -0,0 +1 @@
+pplpy >=0.8.4
diff --git a/build/pkgs/prometheus_client/install-requires.txt b/build/pkgs/prometheus_client/install-requires.txt
new file mode 100644
index 00000000000..e054373395d
--- /dev/null
+++ b/build/pkgs/prometheus_client/install-requires.txt
@@ -0,0 +1 @@
+prometheus_client >=0.8.0
diff --git a/build/pkgs/prompt_toolkit/install-requires.txt b/build/pkgs/prompt_toolkit/install-requires.txt
new file mode 100644
index 00000000000..3a62341b878
--- /dev/null
+++ b/build/pkgs/prompt_toolkit/install-requires.txt
@@ -0,0 +1 @@
+prompt_toolkit >=3.0.5
diff --git a/build/pkgs/psutil/install-requires.txt b/build/pkgs/psutil/install-requires.txt
new file mode 100644
index 00000000000..cafe08598f8
--- /dev/null
+++ b/build/pkgs/psutil/install-requires.txt
@@ -0,0 +1 @@
+psutil >=5.2.0
diff --git a/build/pkgs/ptyprocess/install-requires.txt b/build/pkgs/ptyprocess/install-requires.txt
new file mode 100644
index 00000000000..1f0ce3f011d
--- /dev/null
+++ b/build/pkgs/ptyprocess/install-requires.txt
@@ -0,0 +1 @@
+ptyprocess >=0.5.1
diff --git a/build/pkgs/pybind11/install-requires.txt b/build/pkgs/pybind11/install-requires.txt
new file mode 100644
index 00000000000..7f37917011f
--- /dev/null
+++ b/build/pkgs/pybind11/install-requires.txt
@@ -0,0 +1 @@
+pybind11 >=2.5.0
diff --git a/build/pkgs/pycosat/install-requires.txt b/build/pkgs/pycosat/install-requires.txt
new file mode 100644
index 00000000000..e21caa36951
--- /dev/null
+++ b/build/pkgs/pycosat/install-requires.txt
@@ -0,0 +1 @@
+pycosat >=0.6.3
diff --git a/build/pkgs/pycparser/install-requires.txt b/build/pkgs/pycparser/install-requires.txt
new file mode 100644
index 00000000000..103eeb778e6
--- /dev/null
+++ b/build/pkgs/pycparser/install-requires.txt
@@ -0,0 +1 @@
+pycparser >=2.20
diff --git a/build/pkgs/pycygwin/install-requires.txt b/build/pkgs/pycygwin/install-requires.txt
new file mode 100644
index 00000000000..3bec679b60b
--- /dev/null
+++ b/build/pkgs/pycygwin/install-requires.txt
@@ -0,0 +1 @@
+pycygwin >=0.1
diff --git a/build/pkgs/pygments/install-requires.txt b/build/pkgs/pygments/install-requires.txt
new file mode 100644
index 00000000000..0d0dc97d523
--- /dev/null
+++ b/build/pkgs/pygments/install-requires.txt
@@ -0,0 +1 @@
+pygments >=2.3.1
diff --git a/build/pkgs/pynac/install-requires.txt b/build/pkgs/pynac/install-requires.txt
new file mode 100644
index 00000000000..e49e9c2835c
--- /dev/null
+++ b/build/pkgs/pynac/install-requires.txt
@@ -0,0 +1,2 @@
+# pynac depends on Python but is not available as a pip-installable package.
+# See Trac #30534 "Repackage pynac as a pip-installable package"
diff --git a/build/pkgs/pynormaliz/install-requires.txt b/build/pkgs/pynormaliz/install-requires.txt
new file mode 100644
index 00000000000..b1e222ae76c
--- /dev/null
+++ b/build/pkgs/pynormaliz/install-requires.txt
@@ -0,0 +1 @@
+pynormaliz ==2.12
diff --git a/build/pkgs/pyparsing/install-requires.txt b/build/pkgs/pyparsing/install-requires.txt
new file mode 100644
index 00000000000..036b00c38e1
--- /dev/null
+++ b/build/pkgs/pyparsing/install-requires.txt
@@ -0,0 +1 @@
+pyparsing >=2.3.0
diff --git a/build/pkgs/pyrsistent/install-requires.txt b/build/pkgs/pyrsistent/install-requires.txt
new file mode 100644
index 00000000000..e2e8c5f1c74
--- /dev/null
+++ b/build/pkgs/pyrsistent/install-requires.txt
@@ -0,0 +1 @@
+pyrsistent >=0.16.0
diff --git a/build/pkgs/pysingular/install-requires.txt b/build/pkgs/pysingular/install-requires.txt
new file mode 100644
index 00000000000..f4527297e7d
--- /dev/null
+++ b/build/pkgs/pysingular/install-requires.txt
@@ -0,0 +1 @@
+pysingular >=0.9.5
diff --git a/build/pkgs/python_igraph/install-requires.txt b/build/pkgs/python_igraph/install-requires.txt
new file mode 100644
index 00000000000..9ba34d67725
--- /dev/null
+++ b/build/pkgs/python_igraph/install-requires.txt
@@ -0,0 +1 @@
+python_igraph >=0.7.1999
diff --git a/build/pkgs/python_openid/SPKG.rst b/build/pkgs/python_openid/SPKG.rst
deleted file mode 100644
index 5219fa1e117..00000000000
--- a/build/pkgs/python_openid/SPKG.rst
+++ /dev/null
@@ -1,14 +0,0 @@
-
-python-openid
-=============
-
-Description
------------
-
-OpenID support for servers and consumers.
-
-This is a set of Python packages to support use of the OpenID
-decentralized identity system in your application. Want to enable single
-sign-on for your web site? Use the openid.consumer package. Want to run
-your own OpenID server? Check out openid.server. Includes example code
-and support for a variety of storage back-ends.
diff --git a/build/pkgs/python_openid/checksums.ini b/build/pkgs/python_openid/checksums.ini
deleted file mode 100644
index 6e35600da54..00000000000
--- a/build/pkgs/python_openid/checksums.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-tarball=python_openid-VERSION.tar.gz
-sha1=e1a8e9502abf45e22dbc5f5ef76e56e139ea1b3d
-md5=393f48b162ec29c3de9e2973548ea50d
-cksum=2866118713
diff --git a/build/pkgs/python_openid/dependencies b/build/pkgs/python_openid/dependencies
deleted file mode 100644
index 15df0c4d6d8..00000000000
--- a/build/pkgs/python_openid/dependencies
+++ /dev/null
@@ -1,5 +0,0 @@
-$(PYTHON) | $(PYTHON_TOOLCHAIN)
-
-----------
-All lines of this file are ignored except the first.
-It is copied by SAGE_ROOT/build/make/install into SAGE_ROOT/build/make/Makefile.
diff --git a/build/pkgs/python_openid/package-version.txt b/build/pkgs/python_openid/package-version.txt
deleted file mode 100644
index e6abf6ca3a5..00000000000
--- a/build/pkgs/python_openid/package-version.txt
+++ /dev/null
@@ -1 +0,0 @@
-2.2.5.p0
diff --git a/build/pkgs/python_openid/spkg-install.in b/build/pkgs/python_openid/spkg-install.in
deleted file mode 100644
index deba1bb42bb..00000000000
--- a/build/pkgs/python_openid/spkg-install.in
+++ /dev/null
@@ -1 +0,0 @@
-cd src && sdh_pip_install .
diff --git a/build/pkgs/python_openid/type b/build/pkgs/python_openid/type
deleted file mode 100644
index 134d9bc32d5..00000000000
--- a/build/pkgs/python_openid/type
+++ /dev/null
@@ -1 +0,0 @@
-optional
diff --git a/build/pkgs/pytz/install-requires.txt b/build/pkgs/pytz/install-requires.txt
new file mode 100644
index 00000000000..5b64161c226
--- /dev/null
+++ b/build/pkgs/pytz/install-requires.txt
@@ -0,0 +1 @@
+pytz >=2020.1
diff --git a/build/pkgs/pyzmq/install-requires.txt b/build/pkgs/pyzmq/install-requires.txt
new file mode 100644
index 00000000000..eb492a77265
--- /dev/null
+++ b/build/pkgs/pyzmq/install-requires.txt
@@ -0,0 +1 @@
+pyzmq >=19.0.2
diff --git a/build/pkgs/requests/install-requires.txt b/build/pkgs/requests/install-requires.txt
new file mode 100644
index 00000000000..00427be38f3
--- /dev/null
+++ b/build/pkgs/requests/install-requires.txt
@@ -0,0 +1 @@
+requests >=2.13.0
diff --git a/build/pkgs/rpy2/install-requires.txt b/build/pkgs/rpy2/install-requires.txt
new file mode 100644
index 00000000000..7e5dc5f160a
--- /dev/null
+++ b/build/pkgs/rpy2/install-requires.txt
@@ -0,0 +1 @@
+rpy2 >=3.3, <3.4
diff --git a/build/pkgs/rst2ipynb/install-requires.txt b/build/pkgs/rst2ipynb/install-requires.txt
new file mode 100644
index 00000000000..5c05ec252a1
--- /dev/null
+++ b/build/pkgs/rst2ipynb/install-requires.txt
@@ -0,0 +1 @@
+rst2ipynb >=0.2.2
diff --git a/build/pkgs/sage_numerical_backends_coin/install-requires.txt b/build/pkgs/sage_numerical_backends_coin/install-requires.txt
new file mode 100644
index 00000000000..99021dc9d6d
--- /dev/null
+++ b/build/pkgs/sage_numerical_backends_coin/install-requires.txt
@@ -0,0 +1 @@
+sage_numerical_backends_coin >=9.0b12
diff --git a/build/pkgs/sage_numerical_backends_cplex/install-requires.txt b/build/pkgs/sage_numerical_backends_cplex/install-requires.txt
new file mode 100644
index 00000000000..288c8ddc41d
--- /dev/null
+++ b/build/pkgs/sage_numerical_backends_cplex/install-requires.txt
@@ -0,0 +1 @@
+sage_numerical_backends_cplex >=9.0b12
diff --git a/build/pkgs/sage_numerical_backends_gurobi/install-requires.txt b/build/pkgs/sage_numerical_backends_gurobi/install-requires.txt
new file mode 100644
index 00000000000..cd295468016
--- /dev/null
+++ b/build/pkgs/sage_numerical_backends_gurobi/install-requires.txt
@@ -0,0 +1 @@
+sage_numerical_backends_gurobi >=9.0.0
diff --git a/build/pkgs/sagenb_export/install-requires.txt b/build/pkgs/sagenb_export/install-requires.txt
new file mode 100644
index 00000000000..0592ab651b1
--- /dev/null
+++ b/build/pkgs/sagenb_export/install-requires.txt
@@ -0,0 +1 @@
+sagenb_export >=3.3
diff --git a/build/pkgs/sagetex/install-requires.txt b/build/pkgs/sagetex/install-requires.txt
new file mode 100644
index 00000000000..7a40735a24b
--- /dev/null
+++ b/build/pkgs/sagetex/install-requires.txt
@@ -0,0 +1 @@
+sagetex >=3.5
diff --git a/build/pkgs/scandir/install-requires.txt b/build/pkgs/scandir/install-requires.txt
new file mode 100644
index 00000000000..75f24d3b10a
--- /dev/null
+++ b/build/pkgs/scandir/install-requires.txt
@@ -0,0 +1 @@
+scandir >=1.9.0
diff --git a/build/pkgs/scipy/install-requires.txt b/build/pkgs/scipy/install-requires.txt
new file mode 100644
index 00000000000..2e7f4c30acc
--- /dev/null
+++ b/build/pkgs/scipy/install-requires.txt
@@ -0,0 +1 @@
+scipy >=1.5, <1.6
diff --git a/build/pkgs/send2trash/install-requires.txt b/build/pkgs/send2trash/install-requires.txt
new file mode 100644
index 00000000000..c2f7ee507ef
--- /dev/null
+++ b/build/pkgs/send2trash/install-requires.txt
@@ -0,0 +1 @@
+send2trash >=1.5.0
diff --git a/build/pkgs/setuptools/install-requires.txt b/build/pkgs/setuptools/install-requires.txt
new file mode 100644
index 00000000000..0810ca37277
--- /dev/null
+++ b/build/pkgs/setuptools/install-requires.txt
@@ -0,0 +1 @@
+setuptools >=49.6.0
diff --git a/build/pkgs/setuptools_scm/install-requires.txt b/build/pkgs/setuptools_scm/install-requires.txt
new file mode 100644
index 00000000000..ee00ef62d52
--- /dev/null
+++ b/build/pkgs/setuptools_scm/install-requires.txt
@@ -0,0 +1 @@
+setuptools_scm >=4.1.2
diff --git a/build/pkgs/simplegeneric/install-requires.txt b/build/pkgs/simplegeneric/install-requires.txt
new file mode 100644
index 00000000000..0e30d0f896b
--- /dev/null
+++ b/build/pkgs/simplegeneric/install-requires.txt
@@ -0,0 +1 @@
+simplegeneric >=0.8.1
diff --git a/build/pkgs/singular_jupyter/install-requires.txt b/build/pkgs/singular_jupyter/install-requires.txt
new file mode 100644
index 00000000000..1f86ef4e9a0
--- /dev/null
+++ b/build/pkgs/singular_jupyter/install-requires.txt
@@ -0,0 +1 @@
+singular_jupyter >=0.9.7
diff --git a/build/pkgs/six/install-requires.txt b/build/pkgs/six/install-requires.txt
new file mode 100644
index 00000000000..b5ddf568c87
--- /dev/null
+++ b/build/pkgs/six/install-requires.txt
@@ -0,0 +1 @@
+six >=1.15.0
diff --git a/build/pkgs/snowballstemmer/install-requires.txt b/build/pkgs/snowballstemmer/install-requires.txt
new file mode 100644
index 00000000000..eb38eff43b1
--- /dev/null
+++ b/build/pkgs/snowballstemmer/install-requires.txt
@@ -0,0 +1 @@
+snowballstemmer >=1.2.1
diff --git a/build/pkgs/speaklater/install-requires.txt b/build/pkgs/speaklater/install-requires.txt
new file mode 100644
index 00000000000..e5c328f97ae
--- /dev/null
+++ b/build/pkgs/speaklater/install-requires.txt
@@ -0,0 +1 @@
+speaklater >=1.3
diff --git a/build/pkgs/sphinx/install-requires.txt b/build/pkgs/sphinx/install-requires.txt
new file mode 100644
index 00000000000..d7680fc6a37
--- /dev/null
+++ b/build/pkgs/sphinx/install-requires.txt
@@ -0,0 +1,2 @@
+# gentoo uses 3.2.1
+sphinx >=3, <3.3
diff --git a/build/pkgs/sphinxcontrib_applehelp/install-requires.txt b/build/pkgs/sphinxcontrib_applehelp/install-requires.txt
new file mode 100644
index 00000000000..e42614b6542
--- /dev/null
+++ b/build/pkgs/sphinxcontrib_applehelp/install-requires.txt
@@ -0,0 +1 @@
+sphinxcontrib_applehelp >=1.0.2
diff --git a/build/pkgs/sphinxcontrib_devhelp/install-requires.txt b/build/pkgs/sphinxcontrib_devhelp/install-requires.txt
new file mode 100644
index 00000000000..a8f4070159c
--- /dev/null
+++ b/build/pkgs/sphinxcontrib_devhelp/install-requires.txt
@@ -0,0 +1 @@
+sphinxcontrib_devhelp >=1.0.2
diff --git a/build/pkgs/sphinxcontrib_htmlhelp/install-requires.txt b/build/pkgs/sphinxcontrib_htmlhelp/install-requires.txt
new file mode 100644
index 00000000000..0d93b8218f5
--- /dev/null
+++ b/build/pkgs/sphinxcontrib_htmlhelp/install-requires.txt
@@ -0,0 +1 @@
+sphinxcontrib_htmlhelp >=1.0.3
diff --git a/build/pkgs/sphinxcontrib_jsmath/install-requires.txt b/build/pkgs/sphinxcontrib_jsmath/install-requires.txt
new file mode 100644
index 00000000000..19dbe7af02d
--- /dev/null
+++ b/build/pkgs/sphinxcontrib_jsmath/install-requires.txt
@@ -0,0 +1 @@
+sphinxcontrib_jsmath >=1.0.1
diff --git a/build/pkgs/sphinxcontrib_qthelp/install-requires.txt b/build/pkgs/sphinxcontrib_qthelp/install-requires.txt
new file mode 100644
index 00000000000..a35c181ea85
--- /dev/null
+++ b/build/pkgs/sphinxcontrib_qthelp/install-requires.txt
@@ -0,0 +1 @@
+sphinxcontrib_qthelp >=1.0.3
diff --git a/build/pkgs/sphinxcontrib_serializinghtml/install-requires.txt b/build/pkgs/sphinxcontrib_serializinghtml/install-requires.txt
new file mode 100644
index 00000000000..98fc0654928
--- /dev/null
+++ b/build/pkgs/sphinxcontrib_serializinghtml/install-requires.txt
@@ -0,0 +1 @@
+sphinxcontrib_serializinghtml >=1.1.4
diff --git a/build/pkgs/sphinxcontrib_websupport/install-requires.txt b/build/pkgs/sphinxcontrib_websupport/install-requires.txt
new file mode 100644
index 00000000000..4bfa05dd259
--- /dev/null
+++ b/build/pkgs/sphinxcontrib_websupport/install-requires.txt
@@ -0,0 +1 @@
+sphinxcontrib_websupport >=1.2.1
diff --git a/build/pkgs/sympy/install-requires.txt b/build/pkgs/sympy/install-requires.txt
new file mode 100644
index 00000000000..2241273987b
--- /dev/null
+++ b/build/pkgs/sympy/install-requires.txt
@@ -0,0 +1 @@
+sympy >=1.6, <1.7
diff --git a/build/pkgs/terminado/install-requires.txt b/build/pkgs/terminado/install-requires.txt
new file mode 100644
index 00000000000..c9afcca602d
--- /dev/null
+++ b/build/pkgs/terminado/install-requires.txt
@@ -0,0 +1 @@
+terminado >=0.8.3
diff --git a/build/pkgs/testpath/install-requires.txt b/build/pkgs/testpath/install-requires.txt
new file mode 100644
index 00000000000..acfcd4a1a03
--- /dev/null
+++ b/build/pkgs/testpath/install-requires.txt
@@ -0,0 +1 @@
+testpath >=0.4.4
diff --git a/build/pkgs/tornado/install-requires.txt b/build/pkgs/tornado/install-requires.txt
new file mode 100644
index 00000000000..3956a73c6e6
--- /dev/null
+++ b/build/pkgs/tornado/install-requires.txt
@@ -0,0 +1 @@
+tornado >=6.0.4
diff --git a/build/pkgs/tox/install-requires.txt b/build/pkgs/tox/install-requires.txt
new file mode 100644
index 00000000000..eb752fd0762
--- /dev/null
+++ b/build/pkgs/tox/install-requires.txt
@@ -0,0 +1,2 @@
+# Matches version checked in spkg-configure.m4
+tox >=2.5.0
diff --git a/build/pkgs/traitlets/install-requires.txt b/build/pkgs/traitlets/install-requires.txt
new file mode 100644
index 00000000000..e000fc84749
--- /dev/null
+++ b/build/pkgs/traitlets/install-requires.txt
@@ -0,0 +1 @@
+traitlets >=4.3.3
diff --git a/build/pkgs/tzlocal/install-requires.txt b/build/pkgs/tzlocal/install-requires.txt
new file mode 100644
index 00000000000..1bdc6d48ab9
--- /dev/null
+++ b/build/pkgs/tzlocal/install-requires.txt
@@ -0,0 +1 @@
+tzlocal >=2.1
diff --git a/build/pkgs/vcversioner/install-requires.txt b/build/pkgs/vcversioner/install-requires.txt
new file mode 100644
index 00000000000..dbc9d542440
--- /dev/null
+++ b/build/pkgs/vcversioner/install-requires.txt
@@ -0,0 +1 @@
+vcversioner >=2.16.0.0
diff --git a/build/pkgs/wcwidth/install-requires.txt b/build/pkgs/wcwidth/install-requires.txt
new file mode 100644
index 00000000000..8688831e00d
--- /dev/null
+++ b/build/pkgs/wcwidth/install-requires.txt
@@ -0,0 +1 @@
+wcwidth >=0.1.7
diff --git a/build/pkgs/webencodings/install-requires.txt b/build/pkgs/webencodings/install-requires.txt
new file mode 100644
index 00000000000..a0c04737693
--- /dev/null
+++ b/build/pkgs/webencodings/install-requires.txt
@@ -0,0 +1 @@
+webencodings >=0.5.1
diff --git a/build/pkgs/widgetsnbextension/install-requires.txt b/build/pkgs/widgetsnbextension/install-requires.txt
new file mode 100644
index 00000000000..1b446d635a2
--- /dev/null
+++ b/build/pkgs/widgetsnbextension/install-requires.txt
@@ -0,0 +1 @@
+widgetsnbextension >=3.5.1
diff --git a/build/pkgs/zipp/install-requires.txt b/build/pkgs/zipp/install-requires.txt
new file mode 100644
index 00000000000..0e89638cfe8
--- /dev/null
+++ b/build/pkgs/zipp/install-requires.txt
@@ -0,0 +1 @@
+zipp >=0.5.2