# Flags for POWER8 are defined in Makefile.power. Don't modify COMMON_OPT
# COMMON_OPT = -O2
-# gfortran option for LAPACK
-# enable this flag only on 64bit Linux and if you need a thread safe lapack library
+# gfortran option for LAPACK to improve thread-safety
+# It is enabled by default in Makefile.system for gfortran
# Flags for POWER8 are defined in Makefile.power. Don't modify FCOMMON_OPT
# FCOMMON_OPT = -frecursive
ifeq ($(F_COMPILER), GFORTRAN)
CCOMMON_OPT += -DF_INTERFACE_GFORT
FCOMMON_OPT += -Wall
+# make single-threaded LAPACK calls thread-safe #1847
+FCOMMON_OPT += -frecursive
#Don't include -lgfortran, when NO_LAPACK=1 or lsbcc
ifneq ($(NO_LAPACK), 1)
EXTRALIB += -lgfortran