* Package:    mail-filter/procmail-3.22-r16:0
 * Repository: gentoo
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux mbox
 * FEATURES:   network-sandbox preserve-libs sandbox userpriv usersandbox

>>> Unpacking source...
>>> Unpacking procmail-3.22.tar.gz to /var/tmp/portage/mail-filter/procmail-3.22-r16/work
>>> Source unpacked in /var/tmp/portage/mail-filter/procmail-3.22-r16/work
>>> Preparing source in /var/tmp/portage/mail-filter/procmail-3.22-r16/work/procmail-3.22 ...
 * Applying procmail-lazy-bindings.diff ...
 [ ok ]
 * Applying procmail-comsat-segfault.diff ...
 [ ok ]
 * Applying procmail-maxprocs-fix.diff ...
 [ ok ]
 * Applying procmail-prefix.patch ...
patching file config.h
patching file Makefile
Hunk #4 succeeded at 112 with fuzz 2.
patching file src/autoconf
Hunk #1 succeeded at 1 with fuzz 1.
patching file src/recommend.c
 [ ok ]
 * Adjusting to prefix /
 *   config.h ...
 [ ok ]
 *   Makefile ...
 [ ok ]
 *   autoconf ...
 [ ok ]
 *   recommend.c ...
 [ ok ]
 * Applying procmail-pipealloc.diff ...
 [ ok ]
 * Applying procmail-3.22-glibc-2.10.patch ...
 [ ok ]
 * Applying procmail-3.22-CVE-2014-3618.patch ...
 [ ok ]
 * Applying procmail-3.22-CVE-2017-16844.patch ...
 [ ok ]
 * Applying procmail-3.22-crash-fix.patch ...
 [ ok ]
>>> Source prepared.
 * Modern C testing: this build is using a /etc/portage/bashrc hook (2023-11-30T22:24)!
 * Modern C testing: see https://wiki.gentoo.org/wiki/Modern_C_porting for more info.
>>> Configuring source in /var/tmp/portage/mail-filter/procmail-3.22-r16/work/procmail-3.22 ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/mail-filter/procmail-3.22-r16/work/procmail-3.22 ...
make -j4 CC=clang 
/bin/sh ./initmake /bin/sh "/bin/sh" "/bin/rm -f" "mv -f" "ln" \
 "-lm -ldir -lx -lsocket -lnet -linet -lnsl_s -lnsl_i -lnsl -lsun -lgen -lsockdns -ldl" \
 "/lib /usr/lib" \
 /dev/null "make" o \
 "clang" "-O2 -pipe -march=native -fno-diagnostics-color -Werror=implicit-function-declaration -Werror=implicit-int -std=gnu89 -fno-inline-functions  " "-Wl,-O1 -Wl,--as-needed -Wl,--defsym=__gentoo_check_ldflags__=0  " "procmail lockfile formail mailstat" \
 "procmail formail lockfile" \
 "procmailrc procmailsc procmailex" "src man" \
 "/usr/bin" \
 "strip"
Whoeaaa!  There's something fishy going on here.
You have a look and see if you detect anything uncanny:
*******************************************************
clang -O2 -pipe -march=native -fno-diagnostics-color -Werror=implicit-function-declaration -Werror=implicit-int -std=gnu89 -fno-inline-functions _autotst.c -o _autotst -Wl,-O1 -Wl,--as-needed -Wl,--defsym=__gentoo_check_ldflags__=0
_autotst.c:1:1: error: type specifier missing, defaults to 'int' [-Werror,-Wimplicit-int]
    1 | main()
      | ^
1 error generated.
::::
cc -O2 -pipe -march=native -fno-diagnostics-color -Werror=implicit-function-declaration -Werror=implicit-int -std=gnu89 -fno-inline-functions _autotst.c -o _autotst -Wl,-O1 -Wl,--as-needed -Wl,--defsym=__gentoo_check_ldflags__=0
_autotst.c:1:1: error: return type defaults to ‘int’ [-Werror=implicit-int]
    1 | main()
      | ^~~~
cc1: some warnings being treated as errors
::::
gcc -O2 -pipe -march=native -fno-diagnostics-color -Werror=implicit-function-declaration -Werror=implicit-int -std=gnu89 -fno-inline-functions _autotst.c -o _autotst -Wl,-O1 -Wl,--as-needed -Wl,--defsym=__gentoo_check_ldflags__=0
_autotst.c:1:1: error: type specifier missing, defaults to 'int' [-Werror,-Wimplicit-int]
    1 | main()
      | ^
1 error generated.
::::
*******************************************************
I suggest you take a look at the definition of CFLAGS* and CC
in the Makefile before you try make again.
make: *** [Makefile:128: init] Error 1
 * ERROR: mail-filter/procmail-3.22-r16::gentoo failed (compile phase):
 *   emake failed
 * 
 * If you need support, post the output of `emerge --info '=mail-filter/procmail-3.22-r16::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=mail-filter/procmail-3.22-r16::gentoo'`.
 * The complete build log is located at '/var/log/portage/mail-filter:procmail-3.22-r16:20231202-073801.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/mail-filter/procmail-3.22-r16/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/mail-filter/procmail-3.22-r16/temp/environment'.
 * Working directory: '/var/tmp/portage/mail-filter/procmail-3.22-r16/work/procmail-3.22'
 * S: '/var/tmp/portage/mail-filter/procmail-3.22-r16/work/procmail-3.22'