diff -up highlight-2.6.3/src/makefile.bak highlight-2.6.3/src/makefile
--- highlight-2.6.3/src/makefile.bak	2007-09-04 23:25:34.000000000 +0200
+++ highlight-2.6.3/src/makefile	2007-09-11 21:26:50.000000000 +0200
@@ -15,7 +15,7 @@
 
 CXX=c++
 
-CFLAGS := -O2
+CFLAGS := ${RPM_OPT_FLAGS}
 
 # Do not strip by default (Mac OS X lazy pointer issues)
 # Add -static to avoid linking with shared libs (can cause trouble when highlight