diff --git a/Makefile b/Makefile
index c04074795d..fa210ad722 100644
--- a/Makefile
+++ b/Makefile
@@ -316,8 +316,12 @@ endif
 	-@echo "PNOOPT      = $(LAPACK_FPFLAGS) -O0" >> $(NETLIB_LAPACK_DIR)/make.inc
 ifeq ($(C_COMPILER)$(F_COMPILER)$(USE_OPENMP), CLANGGFORTRAN1)
 	-@echo "LDFLAGS     = $(FFLAGS) $(EXTRALIB) -lomp" >> $(NETLIB_LAPACK_DIR)/make.inc
+else
+ifeq ($(C_COMPILER)$(F_COMPILER)$(USE_OPENMP), CLANGIBM1)
+	-@echo "LDFLAGS     = $(FFLAGS) $(EXTRALIB) -lomp" >> $(NETLIB_LAPACK_DIR)/make.inc
 else
 	-@echo "LDFLAGS     = $(FFLAGS) $(EXTRALIB)" >> $(NETLIB_LAPACK_DIR)/make.inc
+endif
 endif
 	-@echo "CC          = $(CC)" >> $(NETLIB_LAPACK_DIR)/make.inc
 	-@echo "override CFLAGS      = $(LAPACK_CFLAGS)" >> $(NETLIB_LAPACK_DIR)/make.inc
diff --git a/Makefile.system b/Makefile.system
index aadf3459a1..e8feac9e41 100644
--- a/Makefile.system
+++ b/Makefile.system
@@ -1181,7 +1181,7 @@ ifeq ($(F_COMPILER), IBM)
 CCOMMON_OPT += -DF_INTERFACE_IBM
 FEXTRALIB += -lxlf90
 ifeq ($(C_COMPILER), $(filter $(C_COMPILER),GCC CLANG))
-FCOMMON_OPT += -qextname
+FCOMMON_OPT += -qextname -qzerosize
 endif
 # FCOMMON_OPT	+= -qarch=440
 ifdef BINARY64