What can I do, if python3-spidev package is not available and pip3 install spidev errors out because:
(/tmp/pip-log extraction of some lines)
2020-12-22T19:06:45,787 building 'spidev' extension
2020-12-22T19:06:45,794 creating build
2020-12-22T19:06:45,803 creating build/temp.linux-mips-3.7
2020-12-22T19:06:45,806 gcc -Wno-unused-result -Wsign-compare -DNDEBUG -Os -pipe -mno-branch-likely -mips32r2 -mtune=24kc -fno-caller-saves -fno-plt -fhonour-copts -Wno-error=unused-but-set-variable -Wno-error=unused-result -msoft-float -mno-mips16 -mno-interlink-mips16 -iremap/home/novski/openwrt/build_dir/target-mipsel_24kc_musl/Python-3.7.9:Python-3.7.9 -Wformat -Werror=format-security -fstack-protector -D_FORTIFY_SOURCE=1 -Wl,-z,now -Wl,-z,relro -Os -pipe -mno-branch-likely -mips32r2 -mtune=24kc -fno-caller-saves -fno-plt -fhonour-copts -Wno-error=unused-but-set-variable -Wno-error=unused-result -msoft-float -mno-mips16 -mno-interlink-mips16 -iremap/home/novski/openwrt/build_dir/target-mipsel_24kc_musl/Python-3.7.9:Python-3.7.9 -Wformat -Werror=format-security -fstack-protector -D_FORTIFY_SOURCE=1 -Wl,-z,now -Wl,-z,relro -DNDEBUG -fno-inline -Os -pipe -mno-branch-likely -mips32r2 -mtune=24kc -fno-caller-saves -fno-plt -fhonour-copts -Wno-error=unused-but-set-variable -Wno-error=unused-result -msoft-float -mno-mips16 -mno-interlink-mips16 -iremap/home/novski/openwrt/build_dir/target-mipsel_24kc_musl/Python-3.7.9:Python-3.7.9 -Wformat -Werror=format-security -fstack-protector -D_FORTIFY_SOURCE=1 -Wl,-z,now -Wl,-z,relro -DNDEBUG -fno-inline -I/home/novski/openwrt/staging_dir/target-mipsel_24kc_musl/usr/include -I/home/novski/openwrt/staging_dir/target-mipsel_24kc_musl/include -I/home/novski/openwrt/staging_dir/toolchain-mipsel_24kc_gcc-7.5.0_musl/usr/include -I/home/novski/openwrt/staging_dir/toolchain-mipsel_24kc_gcc-7.5.0_musl/include/fortify -I/home/novski/openwrt/staging_dir/toolchain-mipsel_24kc_gcc-7.5.0_musl/include -fPIC -I/usr/include/python3.7 -c spidev_module.c -o build/temp.linux-mips-3.7/spidev_module.o
2020-12-22T19:06:46,990 spidev_module.c:28:10: fatal error: Python.h: No such file or directory
2020-12-22T19:06:46,994 #include <Python.h>
2020-12-22T19:06:46,998 ^~~~~~~~~~
2020-12-22T19:06:47,002 compilation terminated.
2020-12-22T19:06:47,050 error: command 'gcc' failed with exit status 1
2020-12-22T19:06:47,452 ERROR: Failed building wheel for spidev