Build failure with PostgreSQL 18 beta 1

[wolfgangwalther]

Build failure:

src/rum.h:155:9: warning: 'ItemPointerIsMin' macro redefined [-Wmacro-redefined]
  155 | #define ItemPointerIsMin(p)  \
      |         ^
/nix/store/as2qm8a34g3c11g9xp94dz0wl5xnld8y-postgresql-18beta1-dev/include/server/access/ginblock.h:169:9: note: previous definition is here
  169 | #define ItemPointerIsMin(p)  \
      |         ^
In file included from src/rumsort.c:28:
src/rum.h:158:9: warning: 'ItemPointerSetMax' macro redefined [-Wmacro-redefined]
  158 | #define ItemPointerSetMax(p)  \
      |         ^
/nix/store/as2qm8a34g3c11g9xp94dz0wl5xnld8y-postgresql-18beta1-dev/include/server/access/ginblock.h:172:9: note: previous definition is here
  172 | #define ItemPointerSetMax(p)  \
      |         ^
In file included from src/rumsort.c:28:
src/rum.h:165:9: warning: 'ItemPointerIsLossyPage' macro redefined [-Wmacro-redefined]
  165 | #define ItemPointerIsLossyPage(p)  \
      |         ^
/nix/store/as2qm8a34g3c11g9xp94dz0wl5xnld8y-postgresql-18beta1-dev/include/server/access/ginblock.h:176:9: note: previous definition is here
  176 | #define ItemPointerIsLossyPage(p)  \
      |         ^
In file included from src/rumsort.c:28:
src/rum.h:191:3: error: typedef redefinition with different types ('struct PostingItem' vs 'struct PostingItem')
  191 | } PostingItem;
      |   ^
/nix/store/as2qm8a34g3c11g9xp94dz0wl5xnld8y-postgresql-18beta1-dev/include/server/access/ginblock.h:188:3: note: previous definition is here
  188 | } PostingItem;
      |   ^
3 warnings and 1 error generated.
make: *** [<builtin>: src/rumsort.o] Error 1