Install pycurl using the command:

 python3 -m pip install pycurl

ERROR: Command errored out with exit status 1:
command: /Library/Developer/CommandLineTools/usr/bin/python3 -u -c ‘import io, os, sys, setuptools, tokenize; sys.argv[0] = ‘”‘”‘/private/var/folders/3s/kz36vylx0td922n3264rkpwr0000gn/T/pip-install-5p561uh8/pycurl_3b8958baee0a45d8b545ecabadd39816/setup.py'”‘”‘; __file__='”‘”‘/private/var/folders/3s/kz36vylx0td922n3264rkpwr0000gn/T/pip-install-5p561uh8/pycurl_3b8958baee0a45d8b545ecabadd39816/setup.py'”‘”‘;f = getattr(tokenize, ‘”‘”‘open'”‘”‘, open)(__file__) if os.path.exists(__file__) else io.StringIO(‘”‘”‘from setuptools import setup; setup()'”‘”‘);code = f.read().replace(‘”‘”‘\r\n'”‘”‘, ‘”‘”‘\n'”‘”‘);f.close();exec(compile(code, __file__, ‘”‘”‘exec'”‘”‘))’ install –record /private/var/folders/3s/kz36vylx0td922n3264rkpwr0000gn/T/pip-record-4m5f06ct/install-record.txt –single-version-externally-managed –user –prefix= –compile –install-headers /Users/yaqin/Library/Python/3.8/include/python3.8/pycurl
cwd: /private/var/folders/3s/kz36vylx0td922n3264rkpwr0000gn/T/pip-install-5p561uh8/pycurl_3b8958baee0a45d8b545ecabadd39816/
Complete output (119 lines):
Using curl-config (libcurl 7.64.1)
Warning: libcurl is configured to use SSL, but we have not been able to determine which SSL backend it is using. If your Curl is built against OpenSSL, LibreSSL, BoringSSL, GnuTLS, NSS or mbedTLS please specify the SSL backend manually. For other SSL backends please ignore this message.Not using an SSL library
running install
running build
running build_py
creating build
creating build/lib.macosx-10.14.6-x86_64-3.8
creating build/lib.macosx-10.14.6-x86_64-3.8/curl
copying python/curl/__init__.py -> build/lib.macosx-10.14.6-x86_64-3.8/curl
running build_ext
building ‘pycurl’ extension
creating build/temp.macosx-10.14.6-x86_64-3.8
creating build/temp.macosx-10.14.6-x86_64-3.8/src
clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -iwithsysroot/System/Library/Frameworks/System.framework/PrivateHeaders -iwithsysroot/Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/Headers -arch arm64 -arch x86_64 -DPYCURL_VERSION=”7.44.1″ -DHAVE_CURL_SSL=1 -I/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8 -c src/docstrings.c -o build/temp.macosx-10.14.6-x86_64-3.8/src/docstrings.o
In file included from src/docstrings.c:4:
In file included from src/pycurl.h:5:
In file included from /Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8/Python.h:11:
In file included from /Library/Developer/CommandLineTools/usr/lib/clang/12.0.0/include/limits.h:21:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/limits.h:63:
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/cdefs.h:807:2: error: Unsupported architecture
#error Unsupported architecture
^
In file included from src/docstrings.c:4:
In file included from src/pycurl.h:5:
In file included from /Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8/Python.h:11:
In file included from /Library/Developer/CommandLineTools/usr/lib/clang/12.0.0/include/limits.h:21:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/limits.h:64:
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/machine/limits.h:8:2: error: architecture not supported
#error architecture not supported
^
In file included from src/docstrings.c:4:
In file included from src/pycurl.h:5:
In file included from /Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8/Python.h:25:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/stdio.h:64:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/_stdio.h:71:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/_types.h:27:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:33:
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/machine/_types.h:34:2: error: architecture not supported
#error architecture not supported
^
In file included from src/docstrings.c:4:
In file included from src/pycurl.h:5:
In file included from /Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8/Python.h:25:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/stdio.h:64:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/_stdio.h:71:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/_types.h:27:
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:55:9: error: unknown type name ‘__int64_t’
typedef __int64_t       __darwin_blkcnt_t;      /* total blocks */
^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:56:9: error: unknown type name ‘__int32_t’; did you mean ‘__int128_t’?
typedef __int32_t       __darwin_blksize_t;     /* preferred block size */
^
note: ‘__int128_t’ declared here
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:57:9: error: unknown type name ‘__int32_t’; did you mean ‘__int128_t’?
typedef __int32_t       __darwin_dev_t;         /* dev_t */
^
note: ‘__int128_t’ declared here
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:60:9: error: unknown type name ‘__uint32_t’; did you mean ‘__uint128_t’?
typedef __uint32_t      __darwin_gid_t;         /* [???] process and group IDs */
^
note: ‘__uint128_t’ declared here
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:61:9: error: unknown type name ‘__uint32_t’; did you mean ‘__uint128_t’?
typedef __uint32_t      __darwin_id_t;          /* [XSI] pid_t, uid_t, or gid_t*/
^
note: ‘__uint128_t’ declared here
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:62:9: error: unknown type name ‘__uint64_t’
typedef __uint64_t      __darwin_ino64_t;       /* [???] Used for 64 bit inodes */
^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:68:9: error: unknown type name ‘__darwin_natural_t’
typedef __darwin_natural_t __darwin_mach_port_name_t; /* Used by mach */
^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:70:9: error: unknown type name ‘__uint16_t’; did you mean ‘__uint128_t’?
typedef __uint16_t      __darwin_mode_t;        /* [???] Some file attributes */
^
note: ‘__uint128_t’ declared here
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:71:9: error: unknown type name ‘__int64_t’
typedef __int64_t       __darwin_off_t;         /* [???] Used for file sizes */
^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:72:9: error: unknown type name ‘__int32_t’; did you mean ‘__int128_t’?
typedef __int32_t       __darwin_pid_t;         /* [???] process and group IDs */
^
note: ‘__int128_t’ declared here
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:73:9: error: unknown type name ‘__uint32_t’; did you mean ‘__uint128_t’?
typedef __uint32_t      __darwin_sigset_t;      /* [???] signal set */
^
note: ‘__uint128_t’ declared here
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:74:9: error: unknown type name ‘__int32_t’; did you mean ‘__int128_t’?
typedef __int32_t       __darwin_suseconds_t;   /* [???] microseconds */
^
note: ‘__int128_t’ declared here
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:75:9: error: unknown type name ‘__uint32_t’; did you mean ‘__uint128_t’?
typedef __uint32_t      __darwin_uid_t;         /* [???] user IDs */
^
note: ‘__uint128_t’ declared here
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:76:9: error: unknown type name ‘__uint32_t’; did you mean ‘__uint128_t’?
typedef __uint32_t      __darwin_useconds_t;    /* [???] microseconds */
^
note: ‘__uint128_t’ declared here
In file included from src/docstrings.c:4:
In file included from src/pycurl.h:5:
In file included from /Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8/Python.h:25:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/stdio.h:64:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/_stdio.h:71:
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/_types.h:43:9: error: unknown type name ‘__uint32_t’; did you mean ‘__uint128_t’?
typedef __uint32_t      __darwin_wctype_t;
^
note: ‘__uint128_t’ declared here
In file included from src/docstrings.c:4:
In file included from src/pycurl.h:5:
In file included from /Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Ve

export ARCHFLAGS="-arch x86_64"

Then re-execute the installation command to succeed!