[gdbserver] Fix build with make 3.81

---
 gdb/gdbserver/Makefile.in | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/gdb/gdbserver/Makefile.in b/gdb/gdbserver/Makefile.in
index 16a9f2fd38..687bee2658 100644
--- a/gdb/gdbserver/Makefile.in
+++ b/gdb/gdbserver/Makefile.in
@@ -580,9 +580,22 @@ ax.o: ax.c
 	$(COMPILE) $(WARN_CFLAGS_NO_FORMAT) $<
 	$(POSTCOMPILE)
 
+ifeq ($(WORKAROUND_ALLOC_IPA),)
+ifeq ($(MAKE_VERSION),3.81)
+WORKAROUND_ALLOC_IPA = 1
+else
+WORKAROUND_ALLOC_IPA = 0
+endif
+endif
+
+ifeq ($(WORKAROUND_ALLOC_IPA),0)
 alloc-ipa.o: ../alloc.c
 	$(IPAGENT_COMPILE) $(WARN_CFLAGS_NO_FORMAT) $<
 	$(POSTCOMPILE)
+else
+alloc-ipa.o: ../alloc.c
+	@$(MAKE) $(FLAGS_TO_PASS) WORKAROUND_ALLOC_IPA=0 alloc-ipa.o
+endif
 
 # Rules for objects that go in the in-process agent.