Question: Trying to install Python 3.10.0 on MacOS 11.6 (Intel) with pyenv 2.1.0 (from homebrew) fails with: python-build: use openssl@1.1 from homebrew python-build: use readline from homebrew Downloading Python-3.10.0.tar.xz... -> https://www.python.org/ftp/python/3.10.0/Python-3.10.0.tar.xz Installing Python-3.10.0... python-build: use tcl-tk from homebrew python-build: use readline from homebrew python-build: use zlib from xcode sdk BUILD FAILED (OS X 11.6 using python-build 20180424) Inspect or clean up the working tree at /var/folders/rk/_qysk9hs40qcq14h44l57wch0000gn/T/python-build.20211006114013.40649 Results logged to /var/folders/rk/_qysk9hs40qcq14h44l57wch0000gn/T/python-build.20211006114013.40649.log Last 10 log lines: checking MACHDEP... "darwin" checking for gcc... clang checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... configure: error: in `/var/folders/rk/_qysk9hs40qcq14h44l57wch0000gn/T/python-build.20211006114013.40649/Python-3.10.0': configure: error: cannot run C compiled programs. If you meant to cross compile, use `--host'. See `config.log' for more details make: *** No targets specified and no makefile found. Stop.  The config.log in the build folder contains: This file contains any messages produced by compilers while running configure, to aid debugging if configure makes a mistake. It was created by python configure 3.10, which was generated by GNU Autoconf 2.69. Invocation command line was $ ./configure --prefix=/Users/jonas.obrist/.pyenv/versions/3.10.0 --libdir=/Users/jonas.obrist/.pyenv/versions/3.10.0/lib --with-openssl=/usr/local/opt/openssl@1.1 --with-tcltk-libs=-L/usr/local/opt/tcl-tk/lib -ltcl8.6 -ltk8.6 --with-tcltk-includes=-I/usr/local/opt/tcl-tk/include ## --------- ## ## Platform. ## ## --------- ## hostname = Jonas-MBP-2018.local uname -m = x86_64 uname -r = 20.6.0 uname -s = Darwin uname -v = Darwin Kernel Version 20.6.0: Mon Aug 30 06:12:21 PDT 2021; root:xnu-7195.141.6~3/RELEASE_X86_64 /usr/bin/uname -p = i386 /bin/uname -X = unknown /bin/arch = unknown /usr/bin/arch -k = unknown /usr/convex/getsysinfo = unknown /usr/bin/hostinfo = Mach kernel version: Darwin Kernel Version 20.6.0: Mon Aug 30 06:12:21 PDT 2021; root:xnu-7195.141.6~3/RELEASE_X86_64 Kernel configured for up to 12 processors. 6 processors are physically available. 12 processors are logically available. Processor type: x86_64h (Intel x86-64h Haswell) Processors active: 0 1 2 3 4 5 6 7 8 9 10 11 Primary memory available: 32.00 gigabytes Default processor set: 614 tasks, 3158 threads, 12 processors Load average: 2.13, Mach factor: 9.85 /bin/machine = unknown /usr/bin/oslevel = unknown /bin/universe = unknown PATH: /usr/local/Cellar/pyenv/HEAD-483d95d/libexec PATH: /usr/local/Cellar/pyenv/HEAD-483d95d/plugins/python-build/bin PATH: /Users/jonas.obrist/.poetry/bin PATH: /Users/jonas.obrist/.rbenv/shims PATH: /usr/local/opt/llvm/bin PATH: /usr/local/opt/libxml2/bin PATH: /Users/jonas.obrist/.poetry/bin/ PATH: /Users/jonas.obrist/.cargo/bin PATH: /Users/jonas.obrist/.local/bin PATH: /Users/jonas.obrist/.fastlane/bin PATH: /Users/jonas.obrist/.gem/bin PATH: /Users/jonas.obrist/.pyenv/shims PATH: /Users/jonas.obrist/.pyenv/bin PATH: /usr/local/bin PATH: /usr/bin PATH: /bin PATH: /usr/sbin PATH: /sbin PATH: /Library/Apple/usr/bin PATH: /Users/jonas.obrist/go/bin ## ----------- ## ## Core tests. ## ## ----------- ## configure:2878: checking build system type configure:2892: result: x86_64-apple-darwin20.6.0 configure:2912: checking host system type configure:2925: result: x86_64-apple-darwin20.6.0 configure:2955: checking for python3.10 configure:2971: found /Users/jonas.obrist/.pyenv/shims/python3.10 configure:2982: result: python3.10 configure:3076: checking for --enable-universalsdk configure:3123: result: no configure:3147: checking for --with-universal-archs configure:3162: result: no configure:3318: checking MACHDEP configure:3369: result: "darwin" configure:3653: checking for gcc configure:3680: result: clang configure:3909: checking for C compiler version configure:3918: clang --version >&5 Homebrew clang version 12.0.1 Target: x86_64-apple-darwin20.6.0 Thread model: posix InstalledDir: /usr/local/opt/llvm/bin configure:3929: $? = 0 configure:3918: clang -v >&5 Homebrew clang version 12.0.1 Target: x86_64-apple-darwin20.6.0 Thread model: posix InstalledDir: /usr/local/opt/llvm/bin configure:3929: $? = 0 configure:3918: clang -V >&5 clang-12: error: argument to '-V' is missing (expected 1 value) clang-12: error: no input files configure:3929: $? = 1 configure:3918: clang -qversion >&5 clang-12: error: unknown argument '-qversion'; did you mean '--version'? clang-12: error: no input files configure:3929: $? = 1 configure:3949: checking whether the C compiler works configure:3971: clang -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include -I/usr/local/opt/readline/include -I/usr/local/opt/readline/include -I/Users/jonas.obrist/.pyenv/versions/3.10.0/include -I/usr/local/opt/openssl/include -L/usr/local/opt/readline/lib -L/usr/local/opt/readline/lib -L/Users/jonas.obrist/.pyenv/versions/3.10.0/lib -L/usr/local/opt/openssl/lib -L/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib conftest.c >&5 ld: warning: directory not found for option '-L/Users/jonas.obrist/.pyenv/versions/3.10.0/lib' configure:3975: $? = 0 configure:4023: result: yes configure:4026: checking for C compiler default output file name configure:4028: result: a.out configure:4034: checking for suffix of executables configure:4041: clang -o conftest -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include -I/usr/local/opt/readline/include -I/usr/local/opt/readline/include -I/Users/jonas.obrist/.pyenv/versions/3.10.0/include -I/usr/local/opt/openssl/include -L/usr/local/opt/readline/lib -L/usr/local/opt/readline/lib -L/Users/jonas.obrist/.pyenv/versions/3.10.0/lib -L/usr/local/opt/openssl/lib -L/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib conftest.c >&5 ld: warning: directory not found for option '-L/Users/jonas.obrist/.pyenv/versions/3.10.0/lib' configure:4045: $? = 0 configure:4067: result: configure:4089: checking whether we are cross compiling configure:4097: clang -o conftest -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include -I/usr/local/opt/readline/include -I/usr/local/opt/readline/include -I/Users/jonas.obrist/.pyenv/versions/3.10.0/include -I/usr/local/opt/openssl/include -L/usr/local/opt/readline/lib -L/usr/local/opt/readline/lib -L/Users/jonas.obrist/.pyenv/versions/3.10.0/lib -L/usr/local/opt/openssl/lib -L/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib conftest.c >&5 In file included from conftest.c:8: In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:64: /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:93:16: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness] unsigned char *_base; ^ /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:93:16: note: insert '_Nullable' if the pointer may be null unsigned char *_base; ^ _Nullable /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:93:16: note: insert '_Nonnull' if the pointer should never be null unsigned char *_base; ^ _Nonnull /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:138:32: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness] int (* _Nullable _read) (void *, char *, int); ^ /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:138:32: note: insert '_Nullable' if the pointer may be null int (* _Nullable _read) (void *, char *, int); ^ _Nullable /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:138:32: note: insert '_Nonnull' if the pointer should never be null int (* _Nullable _read) (void *, char *, int); ^ _Nonnull /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:138:40: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness] int (* _Nullable _read) (void *, char *, int); ^ /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:138:40: note: insert '_Nullable' if the pointer may be null int (* _Nullable _read) (void *, char *, int); ^ _Nullable /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:138:40: note: insert '_Nonnull' if the pointer should never be null int (* _Nullable _read) (void *, char *, int); ^ _Nonnull /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:139:35: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness] fpos_t (* _Nullable _seek) (void *, fpos_t, int); ^ /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:139:35: note: insert '_Nullable' if the pointer may be null fpos_t (* _Nullable _seek) (void *, fpos_t, int); ^ _Nullable /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:139:35: note: insert '_Nonnull' if the pointer should never be null fpos_t (* _Nullable _seek) (void *, fpos_t, int); ^ _Nonnull /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:140:32: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness] int (* _Nullable _write)(void *, const char *, int); ^ /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:140:32: note: insert '_Nullable' if the pointer may be null int (* _Nullable _write)(void *, const char *, int); ^ _Nullable /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:140:32: note: insert '_Nonnull' if the pointer should never be null int (* _Nullable _write)(void *, const char *, int); ^ _Nonnull /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:140:46: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness] int (* _Nullable _write)(void *, const char *, int); ^ /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:140:46: note: insert '_Nullable' if the pointer may be null int (* _Nullable _write)(void *, const char *, int); ^ _Nullable /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:140:46: note: insert '_Nonnull' if the pointer should never be null int (* _Nullable _write)(void *, const char *, int); ^ _Nonnull /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:144:18: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness] struct __sFILEX *_extra; /* additions to FILE to not break ABI */ ^ /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:144:18: note: insert '_Nullable' if the pointer may be null struct __sFILEX *_extra; /* additions to FILE to not break ABI */ ^ _Nullable /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/_stdio.h:144:18: note: insert '_Nonnull' if the pointer should never be null struct __sFILEX *_extra; /* additions to FILE to not break ABI */ ^ _Nonnull In file included from conftest.c:8: /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:220:5: error: 'TARGET_OS_IPHONE' is not defined, evaluates to 0 [-Werror,-Wundef-prefix=TARGET_OS_] #if TARGET_OS_IPHONE ^ /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:67:13: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness] extern FILE *__stdinp; ^ /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:67:13: note: insert '_Nullable' if the pointer may be null extern FILE *__stdinp; ^ _Nullable /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:67:13: note: insert '_Nonnull' if the pointer should never be null extern FILE *__stdinp; ^ _Nonnull /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:386:41: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness] int (* _Nullable)(void *, const char *, int), ^ /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:386:41: note: insert '_Nullable' if the pointer may be null int (* _Nullable)(void *, const char *, int), ^ _Nullable /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:386:41: note: insert '_Nonnull' if the pointer should never be null int (* _Nullable)(void *, const char *, int), ^ _Nonnull /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:386:55: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness] int (* _Nullable)(void *, const char *, int), ^ /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:386:55: note: insert '_Nullable' if the pointer may be null int (* _Nullable)(void *, const char *, int), ^ _Nullable /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:386:55: note: insert '_Nonnull' if the pointer should never be null int (* _Nullable)(void *, const char *, int), ^ _Nonnull /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:387:44: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness] fpos_t (* _Nullable)(void *, fpos_t, int), ^ /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:387:44: note: insert '_Nullable' if the pointer may be null fpos_t (* _Nullable)(void *, fpos_t, int), ^ _Nullable /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:387:44: note: insert '_Nonnull' if the pointer should never be null fpos_t (* _Nullable)(void *, fpos_t, int), ^ _Nonnull /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:388:41: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness] int (* _Nullable)(void *)); ^ /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:388:41: note: insert '_Nullable' if the pointer may be null int (* _Nullable)(void *)); ^ _Nullable /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:388:41: note: insert '_Nonnull' if the pointer should never be null int (* _Nullable)(void *)); ^ _Nonnull /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:384:6: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness] FILE *funopen(const void *, ^ /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:384:6: note: insert '_Nullable' if the pointer may be null FILE *funopen(const void *, ^ _Nullable /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/stdio.h:384:6: note: insert '_Nonnull' if the pointer should never be null FILE *funopen(const void *, ^ _Nonnull 13 warnings and 1 error generated. configure:4101: $? = 1 configure:4108: ./conftest ./configure: line 4110: ./conftest: No such file or directory configure:4112: $? = 127 configure:4119: error: in `/var/folders/rk/_qysk9hs40qcq14h44l57wch0000gn/T/python-build.20211006114013.40649/Python-3.10.0': configure:4121: error: cannot run C compiled programs. If you meant to cross compile, use `--host'. See `config.log' for more details ## ---------------- ## ## Cache variables. ## ## ---------------- ## ac_cv_build=x86_64-apple-darwin20.6.0 ac_cv_env_CC_set=set ac_cv_env_CC_value=clang ac_cv_env_CFLAGS_set=set ac_cv_env_CFLAGS_value='-I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include ' ac_cv_env_CPPFLAGS_set=set ac_cv_env_CPPFLAGS_value='-I/usr/local/opt/readline/include -I/usr/local/opt/readline/include -I/Users/jonas.obrist/.pyenv/versions/3.10.0/include -I/usr/local/opt/openssl/include' ac_cv_env_CPP_set= ac_cv_env_CPP_value= ac_cv_env_LDFLAGS_set=set ac_cv_env_LDFLAGS_value='-L/usr/local/opt/readline/lib -L/usr/local/opt/readline/lib -L/Users/jonas.obrist/.pyenv/versions/3.10.0/lib -L/usr/local/opt/openssl/lib -L/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib' ac_cv_env_LIBS_set= ac_cv_env_LIBS_value= ac_cv_env_MACHDEP_set= ac_cv_env_MACHDEP_value= ac_cv_env_PROFILE_TASK_set= ac_cv_env_PROFILE_TASK_value= ac_cv_env_build_alias_set= ac_cv_env_build_alias_value= ac_cv_env_host_alias_set= ac_cv_env_host_alias_value= ac_cv_env_target_alias_set= ac_cv_env_target_alias_value= ac_cv_host=x86_64-apple-darwin20.6.0 ac_cv_prog_PYTHON_FOR_REGEN=python3.10 ac_cv_prog_ac_ct_CC=clang ## ----------------- ## ## Output variables. ## ## ----------------- ## ABIFLAGS='' ALT_SOABI='' AR='' ARCH_RUN_32BIT='' ARFLAGS='' BASECFLAGS='' BASECPPFLAGS='' BINLIBDEST='' BLDLIBRARY='' BLDSHARED='' BUILDEXEEXT='' CC='clang' CCSHARED='' CFLAGS='-I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include ' CFLAGSFORSHARED='' CFLAGS_ALIASING='' CFLAGS_NODIST='' CONFIGURE_MACOSX_DEPLOYMENT_TARGET='' CONFIG_ARGS=' '\''--prefix=/Users/jonas.obrist/.pyenv/versions/3.10.0'\'' '\''--libdir=/Users/jonas.obrist/.pyenv/versions/3.10.0/lib'\'' '\''--with-openssl=/usr/local/opt/openssl@1.1'\'' '\''--with-tcltk-libs=-L/usr/local/opt/tcl-tk/lib -ltcl8.6 -ltk8.6'\'' '\''--with-tcltk-includes=-I/usr/local/opt/tcl-tk/include'\'' '\''CC=clang'\'' '\''CFLAGS=-I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include '\'' '\''LDFLAGS=-L/usr/local/opt/readline/lib -L/usr/local/opt/readline/lib -L/Users/jonas.obrist/.pyenv/versions/3.10.0/lib -L/usr/local/opt/openssl/lib -L/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib'\'' '\''CPPFLAGS=-I/usr/local/opt/readline/include -I/usr/local/opt/readline/include -I/Users/jonas.obrist/.pyenv/versions/3.10.0/include -I/usr/local/opt/openssl/include'\''' CPP='' CPPFLAGS='-I/usr/local/opt/readline/include -I/usr/local/opt/readline/include -I/Users/jonas.obrist/.pyenv/versions/3.10.0/include -I/usr/local/opt/openssl/include' CXX='' DEFS='' DEF_MAKE_ALL_RULE='' DEF_MAKE_RULE='' DFLAGS='' DLINCLDIR='' DLLLIBRARY='' DTRACE='' DTRACE_HEADERS='' DTRACE_OBJS='' DYNLOADFILE='' ECHO_C='\c' ECHO_N='' ECHO_T='' EGREP='' ENSUREPIP='' EXEEXT='' EXPORTSFROM='' EXPORTSYMS='' EXPORT_MACOSX_DEPLOYMENT_TARGET='#' EXT_SUFFIX='' FRAMEWORKALTINSTALLFIRST='' FRAMEWORKALTINSTALLLAST='' FRAMEWORKINSTALLAPPSPREFIX='' FRAMEWORKINSTALLFIRST='' FRAMEWORKINSTALLLAST='' FRAMEWORKPYTHONW='' FRAMEWORKUNIXTOOLSPREFIX='/Users/jonas.obrist/.pyenv/versions/3.10.0' GITBRANCH='' GITTAG='' GITVERSION='' GNULD='' GREP='' HAS_GIT='no-repository' HAVE_GETHOSTBYNAME='' HAVE_GETHOSTBYNAME_R='' HAVE_GETHOSTBYNAME_R_3_ARG='' HAVE_GETHOSTBYNAME_R_5_ARG='' HAVE_GETHOSTBYNAME_R_6_ARG='' INSTALL_DATA='' INSTALL_PROGRAM='' INSTALL_SCRIPT='' INSTSONAME='' LDCXXSHARED='' LDFLAGS='-L/usr/local/opt/readline/lib -L/usr/local/opt/readline/lib -L/Users/jonas.obrist/.pyenv/versions/3.10.0/lib -L/usr/local/opt/openssl/lib -L/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib' LDFLAGS_NODIST='' LDLIBRARY='' LDLIBRARYDIR='' LDSHARED='' LDVERSION='' LIBC='' LIBFFI_INCLUDEDIR='' LIBM='' LIBOBJS='' LIBPL='' LIBPYTHON='' LIBRARY='' LIBRARY_DEPS='' LIBS='' LIBTOOL_CRUFT='' LINKCC='' LINKFORSHARED='' LIPO_32BIT_FLAGS='' LIPO_INTEL64_FLAGS='' LLVM_AR='' LLVM_AR_FOUND='' LLVM_PROFDATA='' LLVM_PROF_ERR='' LLVM_PROF_FILE='' LLVM_PROF_FOUND='' LLVM_PROF_MERGER='' LN='' LTLIBOBJS='' MACHDEP='darwin' MACHDEP_OBJS='' MAINCC='' MKDIR_P='' MULTIARCH='' MULTIARCH_CPPFLAGS='' NO_AS_NEEDED='' OBJEXT='' OPENSSL_INCLUDES='' OPENSSL_LDFLAGS='' OPENSSL_LIBS='' OPENSSL_RPATH='' OPT='' OTHER_LIBTOOL_OPT='' PACKAGE_BUGREPORT='https://bugs.python.org/' PACKAGE_NAME='python' PACKAGE_STRING='python 3.10' PACKAGE_TARNAME='python' PACKAGE_URL='' PACKAGE_VERSION='3.10' PATH_SEPARATOR=':' PGO_PROF_GEN_FLAG='' PGO_PROF_USE_FLAG='' PKG_CONFIG='' PLATFORM_TRIPLET='' PLATLIBDIR='' PROFILE_TASK='' PY3LIBRARY='' PYTHONFRAMEWORK='' PYTHONFRAMEWORKDIR='no-framework' PYTHONFRAMEWORKIDENTIFIER='org.python.python' PYTHONFRAMEWORKINSTALLDIR='' PYTHONFRAMEWORKPREFIX='' PYTHON_FOR_BUILD='./$(BUILDPYTHON) -E' PYTHON_FOR_REGEN='python3.10' PY_ENABLE_SHARED='' READELF='' RUNSHARED='' SED='' SHELL='/bin/sh' SHLIBS='' SHLIB_SUFFIX='' SOABI='' SOVERSION='1.0' SRCDIRS='' STATIC_LIBPYTHON='' TCLTK_INCLUDES='' TCLTK_LIBS='' TEST_MODULES='' THREADHEADERS='' TRUE='' TZPATH='' UNIVERSALSDK='' UNIVERSAL_ARCH_FLAGS='' VERSION='3.10' WHEEL_PKG_DIR='' _PYTHON_HOST_PLATFORM='' ac_ct_AR='' ac_ct_CC='clang' ac_ct_CXX='' ac_ct_READELF='' bindir='${exec_prefix}/bin' build='x86_64-apple-darwin20.6.0' build_alias='' build_cpu='x86_64' build_os='darwin20.6.0' build_vendor='apple' datadir='${datarootdir}' datarootdir='${prefix}/share' docdir='${datarootdir}/doc/${PACKAGE_TARNAME}' dvidir='${docdir}' exec_prefix='NONE' host='x86_64-apple-darwin20.6.0' host_alias='' host_cpu='x86_64' host_os='darwin20.6.0' host_vendor='apple' htmldir='${docdir}' includedir='${prefix}/include' infodir='${datarootdir}/info' libdir='/Users/jonas.obrist/.pyenv/versions/3.10.0/lib' libexecdir='${exec_prefix}/libexec' localedir='${datarootdir}/locale' localstatedir='${prefix}/var' mandir='${datarootdir}/man' oldincludedir='/usr/include' pdfdir='${docdir}' prefix='/Users/jonas.obrist/.pyenv/versions/3.10.0' program_transform_name='s,x,x,' psdir='${docdir}' runstatedir='${localstatedir}/run' sbindir='${exec_prefix}/sbin' sharedstatedir='${prefix}/com' sysconfdir='${prefix}/etc' target_alias='' ## ----------- ## ## confdefs.h. ## ## ----------- ## /* confdefs.h */ #define _GNU_SOURCE 1 #define _NETBSD_SOURCE 1 #define __BSD_VISIBLE 1 #define _DARWIN_C_SOURCE 1 #define _PYTHONFRAMEWORK "" configure: exit 1  I am able to build it manually by downloading the tarball and ./configure && make How can I get it to install?

Answer: The problem was that I had a second version of clang installed (via homebrew), which interfered with the build. After running brew uninstall llvm pyenv/python-build picked the clang from xcode and now pyenv works again.