From: Jakub Jirutka <jakub@jirutka.cz>
Date: Mon, 08 Nov 2021 14:56:33 +0100
Subject: [PATCH] Allow to install interfaces headers and server headers separately

Don't install headers of the interfaces (libpq and libecpg) by the install
target, allow to install them separately from the headers needed for server.
We need this for two reasons:

a. Allow building PostgreSQL server with LDAP support, but libpq without
   dependency on LDAP.
b. Allow building/installing PostgreSQL server without the interfaces.
   This is used for non-default postgresql aports (older versions of
   PostgreSQL) - we want to provide just one version of libpq and libecpg
   library provided by the default (newest) postgresql aport.

--- a/src/include/Makefile
+++ b/src/include/Makefile
@@ -26,8 +26,10 @@
 	port/win32_msvc/sys port/win32/arpa port/win32/netinet \
 	port/win32/sys portability
 
-# Install all headers
-install: all installdirs
+# Install server headers
+install: install-server
+install-interfaces: all
+	$(MKDIR_P) '$(DESTDIR)$(includedir)/libpq' '$(DESTDIR)$(includedir_internal)/libpq'
 # These headers are needed by the public headers of the interfaces.
 	$(INSTALL_DATA) $(srcdir)/postgres_ext.h   '$(DESTDIR)$(includedir)'
 	$(INSTALL_DATA) $(srcdir)/libpq/libpq-fs.h '$(DESTDIR)$(includedir)/libpq'
@@ -40,6 +42,8 @@
 	$(INSTALL_DATA) $(srcdir)/port.h         '$(DESTDIR)$(includedir_internal)'
 	$(INSTALL_DATA) $(srcdir)/postgres_fe.h  '$(DESTDIR)$(includedir_internal)'
 	$(INSTALL_DATA) $(srcdir)/libpq/pqcomm.h '$(DESTDIR)$(includedir_internal)/libpq'
+install-server: all
+	$(MKDIR_P) $(addprefix '$(DESTDIR)$(includedir_server)'/, $(SUBDIRS))
 # These headers are needed for server-side development
 	$(INSTALL_DATA) pg_config.h     '$(DESTDIR)$(includedir_server)'
 	$(INSTALL_DATA) pg_config_ext.h '$(DESTDIR)$(includedir_server)'
@@ -64,10 +68,6 @@
 	  chmod $(INSTALL_DATA_MODE) *.h || exit; \
 	done
 
-installdirs:
-	$(MKDIR_P) '$(DESTDIR)$(includedir)/libpq' '$(DESTDIR)$(includedir_internal)/libpq'
-	$(MKDIR_P) $(addprefix '$(DESTDIR)$(includedir_server)'/, $(SUBDIRS))
-
 
 uninstall:
 	rm -f $(addprefix '$(DESTDIR)$(includedir)'/, pg_config.h pg_config_ext.h pg_config_os.h pg_config_manual.h postgres_ext.h libpq/libpq-fs.h)