diff -up smc-tools-1.0.0/Makefile.ldflags smc-tools-1.0.0/Makefile
--- smc-tools-1.0.0/Makefile.ldflags	2017-03-31 12:52:46.000000000 +0200
+++ smc-tools-1.0.0/Makefile	2018-01-10 10:04:08.000000000 +0100
@@ -49,6 +51,7 @@ endif
 all: smc_run ld_pre_smc.so ld_pre_smc32.so smcss smc_pnet
 
 CFLAGS := -Wall -I include -O3 -g
+LDFLAGS :=
 
 ifeq ($(ARCH),s390x)
 	MACHINE_OPT32="-m31"
@@ -62,13 +65,13 @@ smc_run: smc_run.in
 
 ld_pre_smc.so: ld_pre_smc.c
 	${CC} ${CFLAGS} -fPIC -c ld_pre_smc.c
-	${CC} -shared ld_pre_smc.o -ldl -Wl,-z,defs -o ld_pre_smc.so
+	${CC} ${LDFLAGS} -shared ld_pre_smc.o -ldl -Wl,-z,defs -o ld_pre_smc.so
 
 ld_pre_smc32.so: ld_pre_smc.c
 ifeq ($(ARCH64),1)
 ifeq ($(STUFF_32BIT),1)
 	${CC} ${CFLAGS} -fPIC -c ${MACHINE_OPT32} ld_pre_smc.c -o ld_pre_smc32.o
-	${CC} -shared ld_pre_smc32.o ${MACHINE_OPT32} -ldl -o ld_pre_smc32.so
+	${CC} ${LDFLAGS} -shared ld_pre_smc32.o ${MACHINE_OPT32} -ldl -o ld_pre_smc32.so
 else
 	$(warning "Warning: Skipping 31/32-bit library build because 31/32-bit \
 build tools are unavailable. SMC-R will not support 31 and 32 bit TCP \