Makefile: better fix for SCRIPTS_built and 9.4

Makefile.in

@@ -13,9 +13,14 @@ DATA = \
   repmgr--unpackaged--4.0.sql \
   repmgr--4.0.sql
 
+DOCS = README.md repmgr.conf.sample
+
 # Hacky workaround to install the binaries
-SCRIPTS_built += repmgr repmgrd
-SCRIPTS += repmgr repmgrd
+SCRIPTS_built = repmgr repmgrd
+
+all: \
+	repmgr \
+	repmgrd
 
 # When in development add -Werror
 PG_CPPFLAGS = -std=gnu89 -I$(libpq_srcdir) -Wall -Wmissing-prototypes -Wmissing-declarations $(EXTRA_CFLAGS)
@@ -85,3 +90,16 @@ maintainer-additional-clean: clean
 	rm -f config.status config.log
 	rm -f Makefile
 	@rm -rf autom4te.cache/
+
+ifeq ($(MAJORVERSION),9.4)
+# We must emulate SCRIPTS_built for Pg 9.4 as PGXS doesn't support it
+install: install-scripts
+install-scripts:
+	$(INSTALL_SCRIPT) $(SCRIPTS_built) '$(DESTDIR)$(bindir)/'
+.PHONY: install-scripts
+installdirs: installdirs-scripts
+installdirs-scripts:
+	$(MKDIR_P) '$(DESTDIR)$(bindir)'
+.PHONY: installdirs-scripts
+endif
+