pkg/60421: lang/python313: 'expat_config.h' file not found

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>Number:         60421
>Category:       pkg
>Synopsis:       lang/python313: 'expat_config.h' file not found
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jul 07 00:15:00 +0000 2026
>Originator:     Robert Whitlock
>Release:        pkgsrc-current July 6, 2026 (and 2026Q2)
>Organization:
>Environment:
Darwin robs-MacBook-Pro.local 20.6.0 Darwin Kernel Version 20.6.0: Thu Jul  6 22:12:47 PDT 2023; root:xnu-7195.141.49.702.12~1/RELEASE_X86_64 x86_64
>Description:
Building lang/python313 fails with the following output:

=> Bootstrap dependency digest>=20211023: found digest-20220214
===> Skipping vulnerability checks.
WARNING: No /Users/rob/pkgsrcdir/current/pkg/pkgdb/pkg-vulnerabilities file found.
WARNING: To fix run: `/Users/rob/pkgsrcdir/current/pkg/sbin/pkg_admin -K /Users/rob/pkgsrcdir/current/pkg/pkgdb fetch-pkg-vulnerabilities'.
===> Building for python313-3.13.14
clang  -fno-strict-overflow -Wsign-compare -Wunreachable-code -DNDEBUG -O2 -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -I/Users/rob/pkgsrcdir/current/pkg/include -DNCURSES_WIDECHAR=1 -O2 -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -I/Users/rob/pkgsrcdir/current/pkg/include -DNCURSES_WIDECHAR=1 -O2 -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -I/Users/rob/pkgsrcdir/current/pkg/include -DNCURSES_WIDECHAR=1  -std=gnu11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden  -I./Include/internal -I./Include/internal/mimalloc  -I. -I./Include -I/Users/rob/pkgsrcdir/current/pkg/include -DNCURSES_WIDECHAR=1 -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -I/Users/rob/pkgsrcdir/current/pkg/include -DNCURSES_WIDECHAR=1 -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include   -c ./Modules/pyexpat.c -o Modules/pyexpat.
 o
./Modules/pyexpat.c:14:10: fatal error: 'expat_config.h' file not found
#include "expat_config.h"
         ^~~~~~~~~~~~~~~~
1 error generated.
gmake: *** [Makefile:3380: Modules/pyexpat.o] Error 1
*** Error code 2

Stop.
bmake[1]: stopped making "install" in /Users/rob/pkgsrcdir/current/pkgsrc/lang/python313
*** Error code 1

Stop.
bmake: stopped making "install" in /Users/rob/pkgsrcdir/current/pkgsrc/lang/python313
>How-To-Repeat:
cd pkgsrc/lang/python313
bmake install
>Fix: