fix(ci): resolve PostgreSQL extension build failures on macOS and Windows

macOS: install gettext for libintl.h and pass include path via
PG_EXTRA_CFLAGS. Windows: skip POSIX defines (_POSIX_C_SOURCE,
_GNU_SOURCE) so PG headers use Winsock instead of netinet/in.h.

Author: andinux

.github/workflows/main.yml

@@ -305,7 +305,7 @@ jobs:
 
       - name: macos install postgresql
         if: matrix.name == 'macos'
-        run: brew install postgresql@17
+        run: brew install postgresql@17 gettext
 
       - uses: msys2/setup-msys2@v2.27.0
         if: matrix.name == 'windows'
@@ -319,7 +319,7 @@ jobs:
 
       - name: build and package postgresql extension (macos)
         if: matrix.name == 'macos'
-        run: make postgres-package PG_CONFIG=$(brew --prefix postgresql@17)/bin/pg_config
+        run: make postgres-package PG_CONFIG=$(brew --prefix postgresql@17)/bin/pg_config PG_EXTRA_CFLAGS="-I$(brew --prefix gettext)/include"
 
       - name: build and package postgresql extension (windows)
         if: matrix.name == 'windows'

docker/Makefile.postgresql

@@ -48,7 +48,12 @@ PG_OBJS = $(PG_ALL_SRC:.c=.o)
 
 # Compiler flags
 # Define POSIX macros as compiler flags to ensure they're defined before any includes
-PG_CPPFLAGS = -I$(PG_INCLUDEDIR) -Isrc -Isrc/postgresql -Imodules/fractional-indexing -DCLOUDSYNC_POSTGRESQL_BUILD -D_POSIX_C_SOURCE=200809L -D_GNU_SOURCE
+# On Windows, skip POSIX defines — PG headers use Winsock instead of netinet/in.h
+PG_EXTRA_CFLAGS ?=
+PG_CPPFLAGS = -I$(PG_INCLUDEDIR) -Isrc -Isrc/postgresql -Imodules/fractional-indexing -DCLOUDSYNC_POSTGRESQL_BUILD $(PG_EXTRA_CFLAGS)
+ifneq ($(OS),Windows_NT)
+PG_CPPFLAGS += -D_POSIX_C_SOURCE=200809L -D_GNU_SOURCE
+endif
 PG_DEBUG ?= 0
 ifeq ($(PG_DEBUG),1)
 ifeq ($(OS),Windows_NT)