icu: does not install on MacOS15

[cfranzke72 (Christian)]

I just upgraded to MacOS 15 Sequoia and then reinstalled Macports and now try to reinstall my ports but icu does not install:

sudo port -v install icu
--->  Fetching archive for icu
--->  icu-74.2_0.darwin_24.arm64.tbz2 doesn't seem to exist in /opt/local/var/macports/incoming/verified
--->  Attempting to fetch icu-74.2_0.darwin_24.arm64.tbz2 from https://packages.macports.org/icu
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   126    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
--->  Attempting to fetch icu-74.2_0.darwin_24.arm64.tbz2 from https://pek.cn.packages.macports.org/macports/packages/icu
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   153    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
--->  Attempting to fetch icu-74.2_0.darwin_24.arm64.tbz2 from https://kmq.jp.packages.macports.org/icu
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   304    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
--->  Building icu
Executing:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_icu/icu/work/icu/source" && /usr/bin/gnumake -j8 -w all VERBOSE=1
gnumake: Entering directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_icu/icu/work/icu/source'
/Library/Developer/CommandLineTools/usr/bin/gnumake[0]: Making `all' in `stubdata'
gnumake[1]: Entering directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_icu/icu/work/icu/source/stubdata'
/usr/bin/clang++ -DU_ATTRIBUTE_DEPRECATED= -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk -DU_HAVE_STRTOD_L=1 -DU_HAVE_XLOCALE_H=1 -I../common -pipe -Os -stdlib=libc++ -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk -arch arm64 -W -Wall -pedantic -Wpointer-arith -Wwrite-strings -Wno-long-long -std=c++11 -Wno-ambiguous-reversed-operator -fno-common -c -MMD -MT "stubdata.d stubdata.o stubdata.ao" -o stubdata.ao stubdata.cpp
/usr/bin/clang++ -DU_ATTRIBUTE_DEPRECATED= -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk -DU_HAVE_STRTOD_L=1 -DU_HAVE_XLOCALE_H=1 -I../common -pipe -Os -stdlib=libc++ -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk -arch arm64 -W -Wall -pedantic -Wpointer-arith -Wwrite-strings -Wno-long-long -std=c++11 -Wno-ambiguous-reversed-operator -fno-common -c -dynamic -MMD -MT "stubdata.d stubdata.o stubdata.ao" -o stubdata.o stubdata.cpp
In file included from In file included from stubdata.cppstubdata.cpp:22::
22In file included from :
./stubdata.hIn file included from :./stubdata.h30::
30In file included from :
../common/unicode/udata.hIn file included from :../common/unicode/udata.h25:25:
../common/unicode/localpointer.h:
:../common/unicode/localpointer.h45::4510::10 :fatal error:  'memory' file not foundfatal error:
'memory' file not found
   45 |    #45i | n#cilnucdleu d<em e<mmoermyo>r
y      >|
         ^~~~~~~~
|          ^~~~~~~~
1 error generated.
1 error generated.
gnumake[1]: *** [stubdata.ao] Error 1
gnumake[1]: *** Waiting for unfinished jobs....
gnumake[1]: *** [stubdata.o] Error 1
gnumake[1]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_icu/icu/work/icu/source/stubdata'
gnumake: *** [all-recursive] Error 2
gnumake: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_icu/icu/work/icu/source'
Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_icu/icu/work/icu/source" && /usr/bin/gnumake -j8 -w all VERBOSE=1
Exit code: 2
Error: Failed to build icu: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_icu/icu/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets if you believe there
is a bug.
Error: Processing of port icu failed

I have a Macbook Air M1

[ryandesign (Ryan Carsten Schmidt)]

An inability to find system headers seems to be a problem affecting many ports on macOS 15 and/or Xcode 16; see #70750.