From bb4718322294bd9f28b0343a643d0986e9046a2b Mon Sep 17 00:00:00 2001
From: Martin Kroeker <martin@ruby.chemie.uni-freiburg.de>
Date: Sun, 24 Sep 2023 10:13:47 +0200
Subject: [PATCH] Force -qextname for trailing underscore generation when IBM
 xlf is used with gcc

---
 Makefile.system | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Makefile.system b/Makefile.system
index 5a4af9698..ae6db40b0 100644
--- a/Makefile.system
+++ b/Makefile.system
@@ -1167,6 +1167,10 @@ endif
 
 ifeq ($(F_COMPILER), IBM)
 CCOMMON_OPT += -DF_INTERFACE_IBM
+FEXTRALIB += -lxlf90
+ifeq ($(C_COMPILER), GCC)
+FCOMMON_OPT += -qextname
+endif
 # FCOMMON_OPT	+= -qarch=440
 ifdef BINARY64
 FCOMMON_OPT += -q64