diff --git a/config/zfs-build.m4 b/config/zfs-build.m4
index 8fc3863f49..e6c9c21e07 100644
--- a/config/zfs-build.m4
+++ b/config/zfs-build.m4
@@ -160,7 +160,27 @@ AC_DEFUN([ZFS_AC_RPM], [
 	])
 
 	RPM_DEFINE_COMMON='--define "$(DEBUG_ZFS) 1"'
-	RPM_DEFINE_UTIL='--define "_dracutdir $(dracutdir)" --define "_udevdir $(udevdir)" --define "_udevruledir $(udevruledir)" --define "_initconfdir $(DEFAULT_INITCONF_DIR)" $(DEFINE_INITRAMFS) $(DEFINE_SYSTEMD)'
+
+
+	RPM_DEFINE_UTIL=' --define "_initconfdir $(DEFAULT_INITCONF_DIR)"'
+
+        dnl # Make the next three RPM_DEFINE_UTIL additions conditional, since
+        dnl # their values may not be set when running:
+        dnl #
+        dnl #   ./configure --with-config=srpm
+        dnl #
+        AS_IF([test -n "$dracutdir" ], [
+                RPM_DEFINE_UTIL='--define "_dracutdir $(dracutdir)"'
+        ])
+        AS_IF([test -n "$udevdir" ], [
+                RPM_DEFINE_UTIL+=' --define "_udevdir $(udevdir)"'
+        ])
+        AS_IF([test -n "$udevruledir" ], [
+                RPM_DEFINE_UTIL+=' --define "_udevdir $(udevruledir)"'
+        ])
+        RPM_DEFINE_UTIL+=' $(DEFINE_INITRAMFS)'
+        RPM_DEFINE_UTIL+=' $(DEFINE_SYSTEMD)'
+
 	RPM_DEFINE_KMOD='--define "kernels $(LINUX_VERSION)" --define "require_spldir $(SPL)" --define "require_splobj $(SPL_OBJ)" --define "ksrc $(LINUX)" --define "kobj $(LINUX_OBJ)"'
 	RPM_DEFINE_KMOD+=' --define "_wrong_version_format_terminate_build 0"'