diff -ur nsis-2.43-src-64bit-fixes/SCons/Config/gnu nsis-2.43-src-rpm-opt/SCons/Config/gnu
--- nsis-2.43-src-64bit-fixes/SCons/Config/gnu	2009-02-25 08:33:39.000000000 +0100
+++ nsis-2.43-src-rpm-opt/SCons/Config/gnu	2009-03-03 22:24:49.000000000 +0100
@@ -1,5 +1,7 @@
 print "Using GNU tools configuration"
 
+import os
+
 Import('defenv')
 
 ### imports
@@ -89,7 +91,7 @@
 makensis_env.Append(CPPPATH = ['#$BUILD_CONFIG'])
 
 if not defenv['DEBUG']:
-	makensis_env.Append(CCFLAGS = ['-O2'])                  # optimize
+	makensis_env.Append(CCFLAGS = os.getenv('RPM_OPT_FLAGS'))                  # optimize
 makensis_env.Append(CFLAGS = ['-Wall'])                   # all warnings
 makensis_env.Append(CXXFLAGS = ['-Wno-non-virtual-dtor']) # ignore virtual dtor warnings
 makensis_env.Append(CXXFLAGS = ['-Wall'])                 # all warnings
@@ -146,6 +148,7 @@
 
 ### cross-platform util environment adjustments
 
+cp_util_env.Append(CCFLAGS = os.getenv('RPM_OPT_FLAGS'))
 conf = FlagsConfigure(cp_util_env)
 if not defenv['DEBUG'] and defenv['STRIP'] and defenv['STRIP_CP']:
 	TestStrip(conf)                                 # strip