diff -ruN linux-gpib-kernel-4.2.0_rc1.orig/drivers/Makefile.am linux-gpib-kernel-4.2.0_rc1/drivers/Makefile.am
--- linux-gpib-kernel-4.2.0_rc1.orig/drivers/Makefile.am	2018-10-02 11:32:11.000000000 +0200
+++ linux-gpib-kernel-4.2.0_rc1/drivers/Makefile.am	2018-10-09 12:03:21.272433209 +0200
@@ -14,10 +14,8 @@
 
 -include $(top_srcdir)/util/linux_flags/flags
 
-#ignore errors from kernel's make modules in all-local, to avoid failure of make install
-#on nfs filesystem with root_squash
 all-local:
-	-$(MAKE) -C $(LINUX_SRCDIR) V=1 modules\
+	$(MAKE) -C $(LINUX_SRCDIR) V=1 modules\
 		CC="$(LINUX_CC) -I@abs_top_srcdir@ -I@abs_top_srcdir@/compat/include" \
 		CONFIG_GPIB_ISA="$(ENABLE_ISA)" \
 		SUBDIRS="$(GPIB_ABS_MODULE_SUBDIR)"