diff -up redhat-rpm-config-9.0.3/macros.orig redhat-rpm-config-9.0.3/macros
--- redhat-rpm-config-9.0.3/macros.orig	2008-05-06 19:08:20.000000000 -0400
+++ redhat-rpm-config-9.0.3/macros	2009-06-03 15:00:28.000000000 -0400
@@ -67,7 +67,8 @@
 
 %_smp_mflags %([ -z "$RPM_BUILD_NCPUS" ] \\\
 	&& RPM_BUILD_NCPUS="`/usr/bin/getconf _NPROCESSORS_ONLN`"; \\\
-	[ "$RPM_BUILD_NCPUS" -gt 1 ] && echo "-j$RPM_BUILD_NCPUS")
+        if [ "$RPM_BUILD_NCPUS" -gt 16 ]; then echo "-j16"; \\\
+        elif [ "$RPM_BUILD_NCPUS" -gt 1 ]; then echo "-j$RPM_BUILD_NCPUS"; fi)
 
 #==============================================================================
 # ---- Build policy macros.