12 files changed, 33 insertions, 20 deletions
diff --git a/lang/python/README.md b/lang/python/README.md
index 4bceb978d..ac3bf51c7 100644
--- a/lang/python/README.md
+++ b/lang/python/README.md
@@ -332,8 +332,11 @@ These can be installed via pip and ideally they should only be installed like th
 
 Which is why [for example] if you need python cffi on the host build, it's easier to just add it via:
 ```
+PKG_BUILD_PARALLEL:=0
 HOST_PYTHON3_PACKAGE_BUILD_DEPENDS:="cffi==$(PKG_VERSION)"
 ```
 [cffi is one of those packages that needs a host-side package installed].
 
 This works reasonably well in the current OpenWrt build system, as binaries get built for this package and get installed in the staging-dir `$(STAGING_DIR)/usr/lib/pythonX.Y/site-packages`.
+
+`PKG_BUILD_PARALLEL:=0` is necessary because installing packages with multiple concurrent pip processes can lead to [errors or unexpected results](https://github.com/pypa/pip/issues/2361).
diff --git a/lang/python/bcrypt/Makefile b/lang/python/bcrypt/Makefile
index 0f56c4d51..3a8bdf7d9 100644
--- a/lang/python/bcrypt/Makefile
+++ b/lang/python/bcrypt/Makefile
@@ -7,7 +7,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=bcrypt
 PKG_VERSION:=3.1.7
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PYPI_NAME:=$(PKG_NAME)
 PKG_HASH:=0b0069c752ec14172c5f78208f1863d7ad6755a6fae6fe76ec2c80d13be41e42
@@ -16,6 +16,7 @@ PKG_LICENSE:=Apache-2.0
 PKG_LICENSE_FILES:=LICENSE
 
 PKG_BUILD_DEPENDS:=libffi/host
+PKG_BUILD_PARALLEL:=0
 HOST_PYTHON3_PACKAGE_BUILD_DEPENDS:="cffi>=1.1"
 
 include ../pypi.mk
diff --git a/lang/python/numpy/Makefile b/lang/python/numpy/Makefile
index 9bbf1fb5b..42335ae07 100644
--- a/lang/python/numpy/Makefile
+++ b/lang/python/numpy/Makefile
@@ -7,7 +7,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=numpy
 PKG_VERSION:=1.18.5
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PYPI_NAME:=$(PKG_NAME)
 PKG_HASH:=34e96e9dae65c4839bd80012023aadd6ee2ccb73ce7fdf3074c62f301e63120b
@@ -20,7 +20,8 @@ PKG_CPE_ID:=cpe:/a:numpy:numpy
 
 # yes, zip... sigh
 PYPI_SOURCE_EXT:=zip
-HOST_PYTHON3_PACKAGE_BUILD_DEPENDS="Cython==0.29.19"
+PKG_BUILD_PARALLEL:=0
+HOST_PYTHON3_PACKAGE_BUILD_DEPENDS:="Cython==0.29.19"
 
 include ../pypi.mk
 include $(INCLUDE_DIR)/package.mk
diff --git a/lang/python/python-cryptography/Makefile b/lang/python/python-cryptography/Makefile
index a02784303..e5a9a1e03 100644
--- a/lang/python/python-cryptography/Makefile
+++ b/lang/python/python-cryptography/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=python-cryptography
 PKG_VERSION:=2.9.2
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PYPI_NAME:=cryptography
 PKG_HASH:=a0c30272fb4ddda5f5ffc1089d7405b7a71b0b0f51993cb4e5dbb4590b2fc229
@@ -19,6 +19,7 @@ PKG_LICENSE_FILES:=LICENSE.APACHE LICENSE.BSD
 PKG_MAINTAINER:=Jeffery To <jeffery.to@gmail.com>, Alexandru Ardelean <ardeleanalex@gmail.com>
 
 PKG_BUILD_DEPENDS:=libffi/host
+PKG_BUILD_PARALLEL:=0
 
 HOST_PYTHON3_PACKAGE_BUILD_DEPENDS:="cffi>=1.8,!=1.11.3"
 
diff --git a/lang/python/python-jsonschema/Makefile b/lang/python/python-jsonschema/Makefile
index 0e3c7b6b6..efcb76fc6 100644
--- a/lang/python/python-jsonschema/Makefile
+++ b/lang/python/python-jsonschema/Makefile
@@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=python-jsonschema
 PKG_VERSION:=3.2.0
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 
 PYPI_NAME:=jsonschema
 PKG_HASH:=c8a85b28d377cc7737e46e2d9f2b4f44ee3c0e1deac6bf46ddefc7187d30797a
@@ -11,7 +11,8 @@ PKG_MAINTAINER:=Javier Marcet <javier@marcet.info>
 PKG_LICENSE:=MIT
 PKG_LICENSE_FILES:=COPYING
 
-HOST_PYTHON3_PACKAGE_BUILD_DEPENDS=setuptools_scm
+PKG_BUILD_PARALLEL:=0
+HOST_PYTHON3_PACKAGE_BUILD_DEPENDS:=setuptools_scm
 
 include ../pypi.mk
 include $(INCLUDE_DIR)/package.mk
diff --git a/lang/python/python-pluggy/Makefile b/lang/python/python-pluggy/Makefile
index 8d79e0e22..4ed250eae 100644
--- a/lang/python/python-pluggy/Makefile
+++ b/lang/python/python-pluggy/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=python-pluggy
 PKG_VERSION:=0.13.1
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PYPI_NAME:=pluggy
 PKG_HASH:=15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0
@@ -18,12 +18,13 @@ PKG_MAINTAINER:=Jan Pavlinec <jan.pavlinec@nic.cz>
 PKG_LICENSE:=MIT
 PKG_LICENSE_FILES:=LICENSE
 
+PKG_BUILD_PARALLEL:=0
+HOST_PYTHON3_PACKAGE_BUILD_DEPENDS:=setuptools-scm
+
 include ../pypi.mk
 include $(INCLUDE_DIR)/package.mk
 include ../python3-package.mk
 
-HOST_PYTHON3_PACKAGE_BUILD_DEPENDS:=setuptools-scm
-
 define Package/python3-pluggy
   SUBMENU:=Python
   SECTION:=lang
diff --git a/lang/python/python-py/Makefile b/lang/python/python-py/Makefile
index 1ed1a09e0..8d7925453 100644
--- a/lang/python/python-py/Makefile
+++ b/lang/python/python-py/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=python-py
 PKG_VERSION:=1.8.1
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PYPI_NAME:=py
 PKG_HASH:=5e27081401262157467ad6e7f851b7aa402c5852dbcb3dae06768434de5752aa
@@ -18,12 +18,13 @@ PKG_MAINTAINER:=Jan Pavlinec <jan.pavlinec@nic.cz>
 PKG_LICENSE:=MIT
 PKG_LICENSE_FILES:=LICENSE
 
+PKG_BUILD_PARALLEL:=0
+HOST_PYTHON3_PACKAGE_BUILD_DEPENDS:=setuptools-scm
+
 include ../pypi.mk
 include $(INCLUDE_DIR)/package.mk
 include ../python3-package.mk
 
-HOST_PYTHON3_PACKAGE_BUILD_DEPENDS:=setuptools-scm
-
 define Package/python3-py
   SUBMENU:=Python
   SECTION:=lang
diff --git a/lang/python/python-pycparser/Makefile b/lang/python/python-pycparser/Makefile
index b8f63fc37..ce19a5ba7 100644
--- a/lang/python/python-pycparser/Makefile
+++ b/lang/python/python-pycparser/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=python-pycparser
 PKG_VERSION:=2.20
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PYPI_NAME:=pycparser
 PKG_HASH:=2d475327684562c3a96cc71adf7dc8c4f0565175cf86b6d7a404ff4c771f15f0
@@ -18,6 +18,7 @@ PKG_LICENSE:=BSD-3-Clause
 PKG_LICENSE_FILES:=LICENSE
 PKG_MAINTAINER:=Jeffery To <jeffery.to@gmail.com>
 
+PKG_BUILD_PARALLEL:=0
 HOST_PYTHON3_PACKAGE_BUILD_DEPENDS:="ply==3.10"
 
 include ../pypi.mk
diff --git a/lang/python/python-pynacl/Makefile b/lang/python/python-pynacl/Makefile
index fe2c4555d..69ed754dd 100644
--- a/lang/python/python-pynacl/Makefile
+++ b/lang/python/python-pynacl/Makefile
@@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=python-pynacl
 PKG_VERSION:=1.4.0
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PYPI_NAME:=PyNaCl
 PKG_HASH:=54e9a2c849c742006516ad56a88f5c74bf2ce92c9f67435187c3c5953b346505
@@ -12,6 +12,7 @@ PKG_LICENSE:=Apache-2.0
 PKG_LICENSE_FILES:=LICENSE
 
 PKG_BUILD_DEPENDS:=libffi/host
+PKG_BUILD_PARALLEL:=0
 
 HOST_PYTHON3_PACKAGE_BUILD_DEPENDS:="cffi>=1.4.1"
 
diff --git a/lang/python/python-pytest/Makefile b/lang/python/python-pytest/Makefile
index df1aa0ade..8b1dadcb1 100644
--- a/lang/python/python-pytest/Makefile
+++ b/lang/python/python-pytest/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=python-pytest
 PKG_VERSION:=5.4.2
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PYPI_NAME:=pytest
 PKG_HASH:=eb2b5e935f6a019317e455b6da83dd8650ac9ffd2ee73a7b657a30873d67a698
@@ -18,6 +18,7 @@ PKG_MAINTAINER:=Jan Pavlinec <jan.pavlinec@nic.cz>
 PKG_LICENSE:=MIT
 PKG_LICENSE_FILES:=LICENSE
 
+PKG_BUILD_PARALLEL:=0
 HOST_PYTHON3_PACKAGE_BUILD_DEPENDS:=setuptools-scm
 
 include ../pypi.mk
diff --git a/lang/python/python-zipp/Makefile b/lang/python/python-zipp/Makefile
index 19d9e12c1..fede7f14f 100644
--- a/lang/python/python-zipp/Makefile
+++ b/lang/python/python-zipp/Makefile
@@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=python-zipp
 PKG_VERSION:=3.1.0
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PYPI_NAME:=zipp
 PKG_HASH:=c599e4d75c98f6798c509911d08a22e6c021d074469042177c8c86fb92eefd96
@@ -11,6 +11,9 @@ PKG_MAINTAINER:=Jan Pavlinec <jan.pavlinec@nic.cz>
 PKG_LICENSE:=MIT
 PKG_LICENSE_FILES:=LICENSE
 
+PKG_BUILD_PARALLEL:=0
+HOST_PYTHON3_PACKAGE_BUILD_DEPENDS:="setuptools_scm[toml] >= 3.4.1"
+
 include ../pypi.mk
 include $(INCLUDE_DIR)/package.mk
 include ../python3-package.mk
@@ -24,8 +27,6 @@ define Package/python3-zipp
   DEPENDS:=+python3-light
 endef
 
-HOST_PYTHON3_PACKAGE_BUILD_DEPENDS:="setuptools_scm[toml] >= 3.4.1"
-
 define Package/python3-zipp/description
   Backport of pathlib-compatible object wrapper for zip files
 endef
diff --git a/net/seafile-seahub/Makefile b/net/seafile-seahub/Makefile
index ab1888bf3..28396aaa6 100644
--- a/net/seafile-seahub/Makefile
+++ b/net/seafile-seahub/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=seafile-seahub
 PKG_VERSION:=7.1.4
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://codeload.github.com/haiwen/seahub/tar.gz/v$(PKG_VERSION)-server?
@@ -23,7 +23,7 @@ PKG_BUILD_DIR:=$(BUILD_DIR)/seahub-$(PKG_VERSION)-server
 
 HOST_PYTHON3_PACKAGE_BUILD_DEPENDS:="Django~=1.11"
 
-PKG_BUILD_PARALLEL:=1
+PKG_BUILD_PARALLEL:=0
 PYTHON3_PKG_BUILD:=0
 
 include $(INCLUDE_DIR)/package.mk